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R E V I EW Effects of Wearing Compression Stockings on Exercise Performance and Associated Indicators: A Systematic Review This article was published in the following Dove Press journal: Open Access Journal of Sports Medicine Gustavo R Mota 1 Mário Antônio de Moura Simim 2 Izabela Aparecida dos Santos1 Jeffer Eidi Sasaki 1 Moacir Marocolo 3 1Human Performance and Sport Research Group, Department of Sport Sciences, Institute of Health Sciences, Federal University of Triangulo Mineiro, Uberaba, MG, Brazil; 2Research Group in Biodynamic Human Movement, Institute of Physical Education and Sports, Federal University of Ceará, Fortaleza, CE, Brazil; 3Physiology and Human Performance Research Group, Department of Physiology, Federal University of Juiz de Fora, Juiz de Fora, MG, Brazil Abstract: This systematic review investigated the effects of wearing below-knee compres- sion stockings (CS) on exercise performance (or sports activity) and associated physiological and perceived indicators. We searched articles on PubMed using the following terms: “graduated compression stockings”; “compression stockings”; “graduated compression socks”; “compression socks” combined with “performance”, “athletes”, “exercise”, “exercise performance”, “fatigue”, “sports” and “recovery”, resulting in 1067 papers. After checking for inclusion criteria (e.g., original studies, healthy subjects, performance analysis), 21 studies were selected and analyzed. We conclude that wearing CS during exercise improved performance in a small number of studies. However, wearing CS could benefit muscle function indicators and perceived muscle soreness during the recovery period. Future research should investigate the chronic effect of CS on Sports Medicine and athletic performance. Keywords: ergogenic aid, fatigue, sports, medicine, prevention, soccer, running Introduction The prevention of deep venous thrombosis is one of the first evidence-based benefits of wearing compression stockings (CS), demonstrated by a clinical experi- ment in which CS improved the venous return by increasing femoral vein blood flow velocity in hospitalized patients.1 Over time, the interest from the basic medical area has expanded to other fields like Sports Medicine.2 Nowadays, recreational and professional athletes have used CS as a tool for improving perfor- mance or accelerate recovery from training or competitions, and also to reduce lower limb volume,3,4 relieve symptoms of muscle soreness, and fatigue.3–6 Such popularity is probably boosted by the possibility to obtain potential ergogenic benefits with a simple and low-cost aid. There are different types (e.g., shorts for thighs, full-leg) and application modes (e.g., using only after the exercise) for compression garments. However, using CS (bellow-knee) “only during” the exercise are probably more practical (than during recovery, after-exercise) for a significant number of sports/activities. For example, uniform issues would limit whole-body garments in some sports. Also, athletes living in tropical locations could be unmotivated to wear compression garments after training sessions once those garments usually promote higher skin temperatures.7,8 Additionally, there is limited evidence regarding the effects of wearing CS (only) Correspondence: Gustavo R Mota Human Performance and Sport Research Group, Department of Sport Sciences/ Institute of Health Sciences, Federal University of Triângulo Mineiro, Av. Tutunas, 490 Uberaba/MG, Uberaba 38061-500, Brazil Tel +55 34 3700-6633 Email grmotta@gmail.com Open Access Journal of Sports Medicine Dovepress open access to scientific and medical research Open Access Full Text Article submit your manuscript | www.dovepress.com Open Access Journal of Sports Medicine 2020:11 29–42 29 http://doi.org/10.2147/OAJSM.S198809 DovePress © 2020 Mota et al. This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License (http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms (https://www.dovepress.com/terms.php). Leonardo Sampaio Araujo - lsampaio995@gmail.com - CPF: 061.974.667-08 http://orcid.org/0000-0002-6109-0658 http://orcid.org/0000-0002-4659-8357 http://orcid.org/0000-0002-2083-4104 http://orcid.org/0000-0002-7715-2534 http://www.dovepress.com http://www.dovepress.com https://www.facebook.com/DoveMedicalPress/ https://twitter.com/dovepress https://www.linkedin.com/company/dove-medical-press https://www.youtube.com/user/dovepress http://www.dovepress.com/permissions.php during exercise/training/competition, which could be rele- vant for Sports Medicine professionals. Therefore, the pur- pose of this systematic review was to investigate the effect of wearing below-knee CS during exercise (or sports activ- ity) on performance and associated physiological and per- ceptual indicators. Methods A systematic literature search was performed by two inde- pendent reviewers in PubMed. The following terms: (i) “graduated compression stockings”; (ii) “compression stockings”; (iii) “graduated compression socks”; (iv) “compression socks” were combined with “performance”, “athletes”, “exercise”, “exercise performance”, “fatigue”, “sports” and “recovery” (Figure 1). Inclusion Criteria The studies included in this review met the following inclu- sion criteria: 1) original studies; 2) comprised samples of adults (≥ 18 yr); 3) participants were healthy; 4) investi- gated the effects of wearing foot-to-knee (below knee) CS (during exercise) on exercise performance and physiologi- cal and perceptual indicators (e.g., muscle fatigue, muscle recovery, musle soreness); 5) compression stockings worn during the exercise/test/match; and 6) study protocol included exercise or effort tests and performance analysis. The literature search occurred between January 01, 1900, until June 30, 2019. We excluded the following type of articles: conference abstracts, case reports, short communications, systematic reviews, meta-analyses, the- ses, letters to the editor, and protocol papers. Also, we excluded studies involving unhealthy participants: e.g., patients with morbid conditions such as obesity, chronic venous insufficiency, diabetes, hypertension (but not lim- ited to). Analysis The heterogeneity of the selected studies was consider- able: e.g., exercise protocols, fitness level of the partici- pants, variables measured. Thus, we have decided not to evaluate the studies chosen from a statistical point of view. Instead, we performed a qualitative analysis, conducted by two authors focusing on the effects reported by the authors and potential practical implications. All other authors read this qualitative analysis carefully, and edits have been incorporated. Results Figure 1 shows the search, selection, and inclusion pro- cess. The search displayed a total of 1067 papers, which were reduced to 370 after exclusion of duplicate publica- tions. Then, we discarded 39 articles written in non- English languages.9 From the remaining 331 items, we excluded 261 by examining the title. Finally, from the remaining 70 articles, we selected 21 studies for this review according to our inclusion criteria (Figure 1). Table 1 presents a summary of the studies examining the effects of wearing below-knee CS during exercise on performance and associated indicators. Running was the most common type of exercise in the selected studies (76%, 16 out of the 21 studies), followed by soccer (two studies; 10%), triathlon, calf-rise exercise and cycle erg- ometer(one study each one; 5%). All studies were per- formed using a randomized experimental design, with the majority employing a crossover design strategy (13 stu- dies, 62%) (Table 1). Table 2 presents those studies in which CS influenced at least one measurable variable (15 studies, 71%). Three studies (14%) found effects from wearing CS on at least two variables, and for all others (12 studies; 57%) CS affected only one variable (Table 2). Only two studies found some beneficial effect of CS on performance, and a third study improved subsequent performance (Table 2). Two studies did not find per- formance effects of CS for the group mean, but the authors highlighted that CS promoted benefits for some individuals. The main effects of CS are presented with compressions between 20 and 30 mmHg. The range between the minimum compression values is 12 to 28 mmHg, while the maximum values range from 15 to 33 mmHg. Discussion This systematic review aimed to investigate the effect of wearing below-knee CS during exercise on performance and associated indicators. The main finding is that wearing this kind of CS during exercise (or physical activity) improved performance in a minor part of the studies selected (i.e., 3 out of 21). However, a reasonable number of studies have shown evidence that wearing CS could benefit muscle function or fatigue indicators (e.g., CMJ, specific physical tests) and perceived muscle soreness just after the exercise protocol and/or hours after the exercise bout (e.g., during 1 h, 24 h recovery). Mota et al Dovepress submit your manuscript | www.dovepress.com DovePress Open Access Journal of Sports Medicine 2020:1130 Leonardo Sampaio Araujo - lsampaio995@gmail.com - CPF: 061.974.667-08 http://www.dovepress.com http://www.dovepress.com CS and Performance Improvement One of the main reasons for wearing CS during exercise is probably the expectation of performance enhancement due to potential physiological effects.2 This includes better venous return which hasten metabolic removal from the exercising muscles31 and reduce cardiac load,26 improved proprioceptive feedback and better movement accuracy,32 reduced muscle oscillations, lower muscle damage, inflammation, and soreness.6,31 In the current review, only three studies found some CS-induced benefit on performance but did not present adirect mechanistic explanation. For example, astudy concluded that wearing CS (during two soccer matches, 72 hin-between) resulted in higher distances covered in high-intensity activities which are decisive for soccer. Also, CS promoted alower perceived muscle soreness in thesecond match.17 Although the authors did not mea- sure any direct muscle damage marker, they suggested that CS probably protected the eccentric actions com- mon in soccer matches,33 mechanically (i.e., smaller muscle oscillation).6 In this regard, the oscillating forces experienced by the muscle resulted in reduced muscle fatigue. Thus, the CS might offer a mechanical advan- tage reducing muscle oscillation and countering fatigue in high-intensity activities (e.g., intermittent accelera- tion, changing directions).34,35 Figure 1 Flow chart for search and selection of articles. Dovepress Mota et al Open Access Journal of Sports Medicine 2020:11 submit your manuscript | www.dovepress.com DovePress 31 Leonardo Sampaio Araujo - lsampaio995@gmail.com - CPF: 061.974.667-08 http://www.dovepress.com http://www.dovepress.com T ab le 1 C h ar ac te ri st ic s o f th e S tu d ie s E x am in in g th e E ff e ct s o f W e ar in g C S B e lo w -K n e e D u ri n g th e E x e rc is e P e rf o rm an ce an d R e la te d In d ic at o rs D at e- A u th o r S u b je ct s A ge A im E xp er im en ta l D es ig n C P (m m H g) T yp e o f E xe rc is e E xe rc is e P ro to co l/ D et ai ls F in d in gs A li e t al 2 0 0 7 1 0 (E x p e ri m e n t 1 ) 1 4 re cr e at io n al ru n n e rs (m e n ) 2 2 ± 0 .4 To e x am in e th e in fl u e n ce o f w e ar in g gr ad u at e d C S o n p h ys io lo gi ca l an d P e rc e p tu al re sp o n se s d u ri n g an d af te r e x e rc is e R an d o m iz e d cr o ss o ve r 1 8 – 2 2 In te rm it te n t ru n n in g 2 x m u lt i- st ag e fi tn e ss sh u tt le ru n n in g te st , w it h 1 h re co ve ry b e tw e e n te st s C S h ad n o e ff e ct s o n d is ta n ce co ve re d , H R , p e rc e iv e d so re n e ss , R P E an d co m fo rt E x p e ri m e n t 2 1 0 in d iv id u al s p ar ti ci p at e d in b o th e x p e ri m e n ts 2 3 ± 0 .5 R an d o m iz e d cr o ss o ve r 1 8 – 2 2 C o n ti n u o u s ru n n in g 1 0 k m ti m e -t ri al C S d e cr e as e d m u sc le so re n e ss 2 4 h af te r th e 1 0 k m , b u t n o t p e rf o rm an ce , H R , R P E A li e t al 2 0 1 1 1 1 1 2 w e ll- tr ai n e d ru n n e rs (m e n an d w o m e n ) 3 3 ± 1 0 To e x am in e th e e ff e ct s o f w e ar in g d if fe re n t gr ad e s o f C S o n 1 0 k m ru n n in g p e rf o rm an ce an d to as se ss th e e ff e ct s o n p h ys io lo gi ca l an d p e rc e p tu al re sp o n se s af te r e x e rc is e R an d o m iz e d cr o ss o ve r C o n tr o l - 0 L o w 1 2 – 1 5 M e d 1 8 – 2 1 H i 2 3 – 3 2 R u n n in g 1 0 k m ti m e -t ri al C S w o rn d id n o t af fe ct p e rf o rm an ce ; L o w an d M e d C S re su lt e d in gr e at e r m ai n te n an ce o f le g p o w e r af te r 1 0 k m A re ce s e t al 2 0 1 5 1 2 3 4 e x p e ri e n ce d ru n n e rs (3 0 m e n an d 4 w o m e n ) 4 2 ± 7 .8 co n tr o l 4 1 .2 ± 8 .9 C S To in ve st ig at e th e b e n e fi ts o f C S fo r ru n n in g p ac e , p re ve n ti o n o f m u sc le d am ag e , an d m ai n te n an ce o f m u sc le p e rf o rm an ce d u ri n g a re al m ar at h o n R an d o m iz e d C o n tr o lle d tr ia l 2 0 – 2 5 R u n n in g M ar at h o n ra ce (4 2 ,1 9 5 m ) C S d id n o t im p ro ve m ar at h o n ra ce ti m e , m u sc le fu n ct io n , R P E o r m ar k e rs o f m u sc le d am ag e B e rr y e t al 1 9 8 7 1 3 6 h ig h fi t m e n co lle ge st u d e n ts 2 2 .5 ± 5 .4 To d e te rm in e th e e ff e ct s o f C S o n m ax im al o x yg e n co n su m p ti o n , ti m e to e x h au st io n , an d b lo o d la ct at e d u ri n g re co ve ry R an d o m iz e d cr o ss o ve r 8 – 1 8 R u n n in g In cr e m e n ta l tr e ad m ill te st u n ti l e x h au st io n C S h ad n o e ff e ct o n V O 2 m ax , re co ve ry o f V O 2 m ax . B lo o d la ct at e w as lo w e r o n re co ve ry p e ri o d Mota et al Dovepress submit your manuscript | www.dovepress.com DovePress Open Access Journal of Sports Medicine 2020:1132 Leonardo Sampaio Araujo - lsampaio995@gmail.com - CPF: 061.974.667-08 http://www.dovepress.com http://www.dovepress.com B ie u ze n e t al 2 0 1 4 1 4 1 1 h ig h ly tr ai n e d m e n ru n n e rs 3 4 .7 ± 9 .8 To e x am in e th e e ff e ct o f w e ar in g C S o n in d ic e s o f e x e rc is e -i n d u ce d m u sc le d am ag e in a tr ai l- ru n n in g co n te x t R an d o m iz e d cr o ss o ve r 2 5 R u n n in g (s im u la te d tr ai l ra ce ) 1 5 .6 k m to ta l d is ta n ce , b e in g 3 la p s o f 5 .2 k m In m o u n ta in o u s te rr ai n . E ac h la p h ad a cl im b in g (2 .2 k m , ~ 1 3 % ) F o llo w e d b y a d o w n h ill (3 k m , ~ – 9 % ). C S im p ro ve d p o st -e x e rc is e re co ve ry (p e rc e iv e d le g so re n e ss an d m u sc le fu n ct io n ); N o b e n e fi ts o n m ar k e rs o f m u sc le d am ag e / in fl am m at io n B ro p h y- W ill ia m s e t al 2 0 1 9 1 5 1 2 w e ll- tr ai n e d m e n ru n n e rs 3 0 .5 ± 8 .1 To as se ss th e e ff e ct o f w e ar in g C S d u ri n g a 5 k m ru n n in g ti m e -t ri al o n p h ys io lo gi ca l, p e rc e p tu al an d p e rf o rm an ce - b as e d p ar am e te rs , an d su b se q u e n t p e rf o rm an ce C o u n te r- b al an ce d cr oss o ve r e x p e ri m e n t 3 7 ± 4 m m H g at th e m ax im al ca lf gi rt h , 3 1 ± 4 m m H g at th e u p p e r an k le an d 2 3 ± 4 m m H g at th e lo w e r an k le R u n n in g M ax im al 5 k m ti m e - tr ia l o n tr e ad m ill (C S o r co n tr o l) . A su b se q u e n t 5 k m ti m e -t ri al w as p e rf o rm e d 6 0 m in la te r (w it h o u t C S ) C S d id n o t af fe ct im m e d ia te p e rf o rm an ce , b u t h ad a p o si ti ve im p ac t o n su b se q u e n t p e rf o rm an ce (l e ss d e cr e m e n t fr o m fi rs t to th e se co n d 5 k m ti m e -t ri al ) D e l C o so e t al 2 0 1 4 1 6 3 6 e x p e ri e n ce d tr ia th le te s 3 5 .8 ± 6 .3 co n tr o l 3 5 .0 ± 5 .3 C S To in ve st ig at e th e e ff e ct s C S to p re ve n t m u sc u la r d am ag e an d to p re se rv e m u sc u la r p e rf o rm an ce d u ri n g a h al f- ir o n m an co m p e ti ti o n M at ch e d fo r ag e , an th ro p o m e tr ic A n d tr ai n in g st at u s an d ra n d o m ly as si gn e d to C S o r co n tr o l N o t m e n ti o n e d H al f- ir o n m an T ri at h lo n H al f- ir o n m an T ri at h lo n co m p e ti ti o n (1 .9 k m o f sw im m in g, 7 5 k m o f cy cl in g an d 2 1 .1 k m o f ru n n in g) C S d id n o t im p ro ve p e rf o rm an ce , an d d id n o t p re ve n t th e re d u ct io n in lo w e r- lim b m u sc le fu n ct io n , as w e ll as d id n o t re d u ce p o st -r ac e m u sc le d am ag e m ar k e rs G im e n e s e t al 2 0 1 9 1 7 2 0 u n d e r- 2 0 so cc e r p la ye rs (m e n ) 1 8 .3 ± 0 .5 co n tr o l To e va lu at e d th e e ff e ct s o f u si n g C S o n th e m at ch -b as e d p h ys ic al p e rf o rm an ce in d ic at o rs , H R an d p e rc e p tu al re sp o n se s d u ri n g 2 m at ch e s R an d o m iz e d (b al an ce d b y th e p la yi n g p o si ti o n ) 2 0 – 3 0 S o cc e r m at ch e s T w o so cc e r m at ch e s se p ar at e d b y 7 2 h C S m in im iz e d th e in cr e m e n t o f lo ca l m u sc le so re n e ss in th e 2 n d m at ch ; p ro m o te d h ig h e r d is ta n ce co ve re d in h ig h -i n te n si ty ac ti vi ti e s 1 8 .4 ± 0 .4 C S (C on tin ue d) Dovepress Mota et al Open Access Journal of Sports Medicine 2020:11 submit your manuscript | www.dovepress.com DovePress 33 Leonardo Sampaio Araujo - lsampaio995@gmail.com - CPF: 061.974.667-08 http://www.dovepress.com http://www.dovepress.com T ab le 1 (C o n ti n u e d ). D at e- A u th o r S u b je ct s A ge A im E xp er im en ta l D es ig n C P (m m H g) T yp e o f E xe rc is e E xe rc is e P ro to co l/ D et ai ls F in d in gs K e m m le r e t al 2 0 0 9 1 8 2 1 m o d e ra te ly tr ai n e d m e n ru n n e rs 3 9 .3 ± 1 0 .7 To d e te rm in e th e e ff e ct o f C S o n p ar am e te rs o f ru n n in g p e rf o rm an ce R an d o m iz e d cr o ss o ve r 2 4 R u n n in g S te p w is e S p e e d -i n cr e m e n te d tr e ad m ill te st to vo lu n ta ry m ax im u m (e ve ry 5 m in , sp e e d w as in cr e as e d ) C S im p ro ve d ru n n in g p e rf o rm an ce at va ri o u s m e ta b o lic st ag e s: to ta l w o rk an d ti m e u n d e r lo ad ** , m ax im u m sp e e d , p ar am e te rs at th e an ae ro b ic th re sh o ld s M e n e tr ie r e t al 2 0 1 1 1 9 1 4 m o d e ra te y tr ai n e d at h le te s 2 1 .9 ± 0 .7 To d e te rm in e th e e ff e ct s o f ca lf co m p re ss io n sl e e ve s o n ru n n in g p e rf o rm an ce an d o n ca lf ti ss u e o x yg e n sa tu ra ti o n (s to 2 ) at re st b e fo re e x e rc is e an d d u ri n g re co ve ry p e ri o d . R an d o m iz e d cr o ss o ve r 1 8 – 3 0 R u n n in g R u n n in g ti m e to e x h au st io n C S d id n o t im p ro ve ti m e s to e x h au st io n p e rf o rm e d ; H o w e ve r, th e S tO 2 re su lt s ar gu e fo r fu rt h e r in te re st o f th is ga rm e n t d u ri n g e ff o rt re co ve ry . M iy am o to e t al 2 0 1 1 2 0 1 4 h e al th y m e n 2 5 .6 ± 3 .7 To e x am in e th e e ff e ct s o f w e ar in g a C S , w it h d if fe re n t p re ss u re p ro fi le s d u ri n g a fa ti gu in g ca lf -r ai se e x e rc is e se ss io n , o n th e to rq u e ge n e ra ti n g ca p ac it y af te r e x e rc is e . R an d o m iz e d cr o ss o ve r 1 8 an d 3 0 C al f- ra is e e x e rc is e 1 5 se ts o f 1 0 re p e ti ti o n s o f ca lf - ra is e e x e rc is e - 3 0 s re st b e tw e e n se ts C S w it h ad e q u at e p re ss u re at th e ca lf re gi o n re lie ve s m u sc le fa ti gu e o f th e tr ic e p s su ra e in d u ce d b y ca lf - ra is e e x e rc is e . P av in e t al 2 0 1 9 2 1 2 0 am at e u r fe m al e so cc e r p la ye rs 2 0 .6 ± 3 .9 To e va lu at e th e e ff e ct o f C S u se d u ri n g an am at e u r fe m al e so cc e r m at ch o n m at ch - in d u ce d fa ti gu e in d ic at o rs R an d o m iz e d (b al an ce d b y th e p la yi n g p o si ti o n ) 2 0 – 3 0 S o cc e r m at ch A si n gl e so cc e r m at ch C S p o si ti ve ly in fl u e n ce d ag ili ty an d lo w e r lim b m u sc u la r e n d u ra n ce (s ta n d in g h e e l- ri se ) p e rf o rm an ce s fo llo w in g th e m at ch R id e r e t al 2 0 1 4 2 2 1 0 cr o ss - co u n tr y ru n n e rs (m e n an d w o m e n ) M e n 2 1 ± 1 .3 W o m e n 1 8 .7 ± 0 .6 To d e te rm in e th e e ff e ct o f C S o n p h ys io lo gi ca l va ri ab le s as so ci at e d w it h ru n n in g p e rf o rm an ce R an d o m iz e d C ro ss o ve r 1 5 – 2 2 R u n n in g M ax im al tr e ad m ill te st C S d id n o t im p ro ve ru n n in g p e rf o rm an ce , b u t co u ld le n d cr e d e n ce to ce rt ai n m an u fa ct u re rs cl ai m s o f im p ro ve d re co ve ry th ro u gh lo w e r B L a va lu e s af te r e x e rc is e Mota et al Dovepress submit your manuscript | www.dovepress.com DovePress Open Access Journal of Sports Medicine 2020:1134 Leonardo Sampaio Araujo - lsampaio995@gmail.com - CPF: 061.974.667-08 http://www.dovepress.com http://www.dovepress.com R im au d e t al 2 0 1 0 2 3 8 h e al th y tr ai n e d m al e s 2 1 .7 ± 0 .9 To in ve st ig at e if w e ar in g C S d u ri n g e x e rc is e an d re co ve ry co u ld af fe ct la ct at e p ro fi le in sp o rt sm e n R an d o m iz e d cr o ss o ve r 1 2 – 2 2 C yc le e rg o m e te r In cr e m e n ta l cy cl e e rg o m e te r te st C S d u ri n g gr ad e d e x e rc is e le ad to a si gn ifi ca n t h ig h e r b lo o d la ct at e va lu e at e x h au st io n , p ro b ab ly d u e to a h ig h e r la ct at e ac cu m u la ti o n re la te d to a gr e at e r o ve ra ll co n tr ib u ti o n o f an ae ro b ic gl yc o ly si s in th e e n e rg y su p p ly w h e n su b je ct s w o re C S d u ri n g e x e rc is e S p e rl ic h e t al 2 0 1 0 2 4 1 5 w e ll- tr ai n e d e n d u ra n ce at h le te s 2 7 .1 ± 4 .8 To te st th re e ty p e s o f co m p re ss io n cl o th in g o n w e ll- tr ai n e d at h le te s to as se ss p h ys io lo gi ca l re sp o n se s an d e ff e ct s o n p e rf o rm an ce R an d o m iz e d cr o ss o ve r 2 0 R u n n in g In cr e m e n ta l te st in tr e ad m ill C S d id n o t im p ro ve d ti m e to e x h au st io n o r re su lt e d in an y al te re d o x yg e n u p ta k e re sp o n se , la ct at e co n ce n tr at io n , o r ra ti n gs o f p e rc e iv e d e x e rt io n an d m u sc le so re n e ss d u ri n g m ax im al an d su b m ax im al e x e rc is e T re se le r e t al 2 0 1 6 2 5 1 9 re cr e at io n al ly ac ti ve w o m e n 2 0 ± 1 To e x am in e th e p h ys io lo gi ca l an d p e rc e p tu al re sp o n se s to w e ar in g b e lo w -t h e -k n e e C S af te r a 5 -k m ru n n in g p e rf o rm an ce R an d o m iz e d cr o ss o ve r 1 2 .6 – 2 1 C o n ti n u o u s ru n n in g 5 k m ti m e -t ri al C S h ad n o e ff e ct s o n 5 k m ti m e an d H R , b u t re su lt e d in le ssm u sc le so re n e ss in lo w e r e x tr e m it ie s an d h ig h e r R P E V ar e la -S an z e t al 2 0 1 1 2 6 (E x p e ri m e n t 1 ) 1 6 e n d u ra n ce tr ai n e d at h le te s (m e n an d w o m e n ) 3 4 .7 ± 6 .3 To e x am in e th e e ff e ct o f gr ad u al -e la st ic co m p re ss io n st o ck - in gs (g cs s) o n ru n n in g e co n o m y R an d o m iz e d re p e at e d - m e as u re s d e si gn 1 5 – 2 2 C o n ti n u o u s ru n n in g 4 b o u ts o f 6 -m in h al f- m ar at h o n p ac e tr e ad m ill ru n n in g C S h ad n o e ff e ct s o n ru n n in g e co n o m y an d R P E E x p e ri m e n t 2 1 2 e n d u ra n ce tr ai n e d at h le te s (m e n an d w o m e n ) *T h e se in d iv id u al s al so p ar ti ci p at e d in e x p e ri m e n t 1 N o t d e sc ri b e d To e x am in e th e e ff e ct o f gc ss o n k in e m at ic s, an d ru n n in g p e rf o rm an ce R an d o m iz e d n o n – cr o ss o ve r d e si gn 1 5 – 2 2 C o n ti n u o u s ru n n in g T re ad m ill ru n n in g u n ti l e x h au st io n at 1 0 5 % o f th e at h le te ’s re ce n t 1 0 -k m ti m e an d 1 % gr ad e C S re su lt e d in lo w e r % H R m a x . N o e ff e ct s o f th e C S w e re o b se rv e d fo r ti m e to fa ti gu e , H R p e a k , la ct at e , R P E , V O 2 p e a k , sp e e d , % V O 2 m a x , an d R E (C on tin ue d) Dovepress Mota et al Open Access Journal of Sports Medicine 2020:11 submit your manuscript | www.dovepress.com DovePress 35 Leonardo Sampaio Araujo - lsampaio995@gmail.com - CPF: 061.974.667-08 http://www.dovepress.com http://www.dovepress.com T ab le 1 (C o n ti n u e d ). D at e- A u th o r S u b je ct s A ge A im E xp er im en ta l D es ig n C P (m m H g) T yp e o f E xe rc is e E xe rc is e P ro to co l/ D et ai ls F in d in gs V e rc ru ys se n e t al 2 0 1 2 2 7 1 1 m al e tr ai n e d ru n n e rs 3 4 .7 ± 9 .8 To in ve st ig at e th e e ff e ct s o f C S o n p e rf o rm an ce in d ic at o rs an d p h ys io lo gi ca l re sp o n se s d u ri n g p ro lo n ge d tr ai l ru n n in g R an d o m iz e d cr o ss o ve r 1 8 C o n ti n u o u s ru n n in g 1 5 .6 k m tr ai l- ru n n in g C S h ad n o e ff e ct s o n ru n ti m e , H R , b lo o d la ct at e co n ce n tr at io n an d R P E W ah l e t al 2 0 1 2 2 8 9 w e ll- tr ai n e d , m al e e n d u ra n ce at h le te s 2 2 .2 ± 1 .3 To te st if d if fe re n t le ve ls o f so ck co m p re ss io n af fe ct e ry th ro cy te d e fo rm ab ili ty an d m e ta b o lic p ar am e te rs d u ri n g su b -m ax im al an d m ax im al ru n n in g R an d o m iz e d re p e at e d - m e as u re s d e si gn 0 , 1 0 , 2 0 , an d 4 0 C o n ti n u o u s ru n n in g 3 0 m in su b -m ax im al ru n n in g an d ti m e to e x h au st io n th e re af te r u si n g a ra m p te st (i n cr e as e in in cl in e o f 1 % e ve ry m in u te ) C S h ad n o e ff e ct s o n e ry th ro cy te d e fo rm ab ili ty , h e ar t ra te , p O 2 an d la ct at e co n ce n tr at io n . H o w e ve r, e x e rc is e it se lf si gn ifi ca n tl y in cr e as e d e ry th ro cy te d e fo rm ab ili ty , w it h h ig h C S at te n u at in g th is e ff e ct . Z ad o w e t al 2 0 1 8 2 9 6 7 m ar at h o n ru n n e rs (m e n an d w o m e n ) 4 6 .7 ± 1 0 .3 To in ve st ig at e th e e ff e ct o f w e ar in g co m p re ss io n so ck s o n co ag u la ti o n an d fi b ri n o ly si s fo llo w in g a m ar at h o n R an d o m iz e d co n tr o lle d tr ia l N o t d e sc ri b e d C o n ti n u o u s ru n n in g M ar at h o n ra ce (4 2 ,1 9 5 m ) C S si gn ifi ca n tl y re d u ce d p o st - m ar at h o n D -D im e r co n ce n tr at io n s Z al e sk i e t al 2 0 1 8 3 0 2 0 ru n n e rs (m e n an d w o m e n ) C o n tr o l: 3 5 .5 ± 8 .0 C S : 3 6 .9 ± 8 .4 To e x am in e th e in fl u e n ce o f C S w o rn d u ri n g a m ar at h o n o n cr e at in e k in as e le ve ls R an d o m iz e d co n tr o lle d tr ia l 1 9 – 2 5 C o n ti n u o u s ru n n in g M ar at h o n ra ce (4 2 ,1 9 5 m ) C S h ad n o e ff e ct s o n C K le ve ls at b as e lin e , im m e d ia te ly fo llo w in g, o r 2 4 h af te r a m ar at h o n ra ce . N o te s: ** T im e u n d e r lo ad m e an s th e m ax im al am o u n t o f m in u te s p e rf o rm e d at a su b m ax im al sp e e d (i .e ., 9 to 1 1 k m .h − 1 ) to e n su re o ve r 3 0 m in s ru n n in g. A b b re vi at io n s: C P, co m p re ss io n p re ss u re ; C M J, co u n te rm o ve m e n t ju m p s; C K , cr e at in e k in as e ; C S , co m p re ss io n st o ck in gs ; E S C o h e n ’s d , e ff e ct si ze ; R P E , ra ti n g o f p e rc e iv e d e x e rt io n . Mota et al Dovepress submit your manuscript | www.dovepress.com DovePress Open Access Journal of Sports Medicine 2020:1136 Leonardo Sampaio Araujo - lsampaio995@gmail.com - CPF: 061.974.667-08 http://www.dovepress.com http://www.dovepress.com Table 2 Studies That Found Effects from Wearing CS During Exercise Study Potential Benefited Variable Summary Effects from CS No Effects from CS Ali et al 200710 Muscle soreness Experiment 2: CS decreased muscle soreness following each exercise bout, and 24 h after the 10 km time-trial; Performance was not influence by CS (P=0.15) Experiment 2: Lower perceived muscle soreness potential Individual improvements: 10 of the 14 Participants ran faster ~ 20 s Experiment 1: Distance covered on the multi-stage fitness Shuttle running test HRmean Perceived muscle soreness RPE Experiment 2: Time to complete 10 km time-trial (mean) Time to complete 1st and 2nd 5 km partial time RPE Ali et al 201111 Muscle fatigue CS worn (low and medium compression) resulted in greater maintenance of leg power after 10 km, but performance on 10 km did not Vertical jump height higher (from pre-to post-10 km running) when wearing Low (12–15 mm Hg) and Med (18–21 mm Hg) CS Time to complete 10 km RPE HRmean High (23–32 mmHg) CS had no benefit for vertical jump post- 10 km Berry et al 198713 Lactate recovery CS did not affect the VO2max, recovery of VO2max, but blood lactate was lower on the recovery period when CS was worn during incremental treadmill test until exhaustion Lower blood lactate after the incremental test (at 15 min of the recovery period) VO2max Time to exhaustion recovery of VO2max Bieuzen et al 201414 Muscle soreness Muscle fatigue-recovery CS improved post-exercise recovery (perceived leg soreness and muscle function); CS did not influence the performance (15.6 km in mountainous terrain) and markers of muscle damage/ inflammation Lower perceived muscle soreness Higher isometric peak torque and MVC (knee extensors) at 1 h (ES small) and 24 h post-run All recovery periods on CMJ (ES large) Time to complete 15.6 km RPE HR responses CK and interleukin-6 levels Brophy-Williams et al 201915 Subsequent performance CS did not affect immediate performance, but had a positive impact on subsequent performance (1 h later) Lower decrement from TT1 to TT2 (~9.5 s vs control) on time to complete 5 km Time to complete TT1 (5 km) Time to complete TT2 (5 km) Oxygen consumption Blood lactate Cross sectional area of calf RPE Perceived muscle soreness Perceived fatigue Perceived recovery Gimenes et al 201917 Muscle soreness Acute performance CS minimized the increment of local muscle soreness in the 2nd match (two soccer matches with 72 h in-between); CS also improved performance in high- intensity activities during the matches Minimized the increment of muscle soreness on match 2; Higher distances covered > 19.1 km.h1 and ≥ 23 km.h−1 on match 1 higher distances covered between 19.1 and 22.99 km.h−1 on match 2 Match 1 Perceived soreness and recovery RPE HRmean, HRpeak Internal load (RPE x minutes played) Sprints repetitions Distances covered in total and below 19.1 km.h−1 Match 2 Perceivedrecovery RPE HRmean, HRpeak Internal load (RPE x minutes played) Sprints repetitions Distances covered in total and below 19.1 km.h−1 (Continued) Dovepress Mota et al Open Access Journal of Sports Medicine 2020:11 submit your manuscript | www.dovepress.com DovePress 37 Leonardo Sampaio Araujo - lsampaio995@gmail.com - CPF: 061.974.667-08 http://www.dovepress.com http://www.dovepress.com Table 2 (Continued). Study Potential Benefited Variable Summary Effects from CS No Effects from CS Kemmler et al 200918 Acute performance Anaerobic threshold CS improved running performance and metabolic indicators (anaerobic threshold) Time under load** (ES 0.40) Total work (ES: 0.30) Running at the anaerobic (ES: 0.22) And aerobic thresholds (ES: 0.28) VO2max Maximal lactate concentration HRmax Pulmonary ventilation Ventilator equivalent Respiratory exchange ratio Menetrier et al 201119 Oxygen saturation at recovery CS did not improve performance, however CS increased calf tissue oxygen saturation at rest and during recovery from exercise Increased calf tissue oxygen saturation at rest (before exercise): + 6.4±1.9% And during recovery: + 7.4±1.7% and + 10.7 ± 1.8% at 20th And 30th min of the last recovery period, respectively Times to exhaustion performed HRmean HRmax RPE Miyamoto et al 201120 Muscle fatigue CS had no effect on the decline of MVC, but the extent of reduction of the evoked triplet torque was smaller when wearing CS with a high compression pressure The decline of the MPF in the CS 30 mmHg was significantly smaller than that in 0 mmHg (control) Reduction of the MVC torque after the calf-raise among 0 (control), 18 and 30 mmHg CS EMG amplitude during the MVC was decreased, the extent to which was not significantly different among the three Conditions both for the medial gastrocnemius and soleus M-wave amplitude (evoked contraction) Pavin et al 201921 Muscle fatigue CS positively influenced agility and lower limb muscular endurance performances following a soccer match After-match kept the time to complete T-test Agility (control performed slower) from baseline Control presented greater decrement after-match (ES = 1.27 control vs. CS) in the heel-rise test repetitions from baseline Distance covered in the Yo-Yo intermittent endurance level 2 after match HRmean, peak and %peak RPE Rider et al 201422 **worst acute performance Lactate recovery CS did not improve running performance, but seem to improve recovery after exercise Time to fatigue lower in CS (**negative) Blood lactate lower during recovery (1 and 5 min) HR blood lactate (during the maximal treadmill test) lactate threshold VO2max Respiratory exchange ratio RPE Rimaud et al 201023 Lactate recovery CS did not improve performance during graded maximal exercise but lead to a higher contribution of anaerobic glycolysis and improved lactate removal during passive recovery. However, CS efficacy is highly limited Higher blood lactate value at exhaustion Lactate removal ability was improved (during passive recovery) Submaximal/maximal HR VO2 Performance (W on VO2max) SBP RPE Treseler et al 201625 Muscle soreness CS decreased muscle soreness (24 h post-run) in lower extremities, (but not for calf) and presented higher RPE (feelings of working harder with CS); CS did not influence 5 km performance (P=0.74) Lower perceived muscle soreness 24 h later Potential individual improvement (10 of 19 participants ran faster ~10 s) Time to complete 5 km time-trial (mean) HR responses Rate of perceived recovery (Continued) Mota et al Dovepress submit your manuscript | www.dovepress.com DovePress Open Access Journal of Sports Medicine 2020:1138 Leonardo Sampaio Araujo - lsampaio995@gmail.com - CPF: 061.974.667-08 http://www.dovepress.com http://www.dovepress.com Another study showed CS-induced ergogenic effects on performance. The authors found an improvement in running performance concomitantly with anaerobic and aerobic thresholds when participants wore CS.18 The ben- efits of CS-ergogenic effects on performance are attributed to enhanced biomechanical support of the muscles, leading to higher efficiency and lower metabolic costs at given workloads,18,36 reduction of muscular microtrauma,6 and enhanced the proprioception.32 During a 5 km running time-trial (Brophy-Williams et al15) the wearing CS did not affect immediate performance. However, CS generated a positive impact on subsequent 5 km running (i.e., less performance decrement from time-trial 1 to time-trial 2). Again, the underlying mechanism of such benefit is unclear but may be related to increased oxygen delivery, lower muscle oscillation, and better running mechanics.15 Despite the current results, the literature does not indi- cate robust evidence favoring the use of CS during exercise (i.e., only three studies found benefits on performance). Researchers should be careful in drawing conclusions. Considering that each specific study has (or had) a particular experimental design (e.g., exercise protocol, duration, intensity, variables measured, fitness level of the participants), it becomes difficult to generalize the results from the different studies. Thus, it is essential to consider the risk of bias and heterogeneity of the studies. As the same protocol does not conduct different studies, they will vary in the characteristics of the included population, inter- ventions, diagnostic methods to access outcomes, etc. (clin- ical heterogeneity). Thus, these studies may be biased.37 Additionally, two studies did not find CS-induced effects on group mean performance, but the authors highlighted the individual improvements: 10 of 19 runners ran the 5 km time-trial approximately 10 s faster,25 and 10 of the 14 runners ran the 10 km time-trial10 approximately 20 s faster. Therefore, individual responses should be care- fully evaluated in practical settings. CS, Muscle Function and Perceived Muscle Soreness Some studies in the current review have shown that CS can induce lower muscle fatigue after an exercise protocol with the same workload than a control condition.11,14,20,21 The lower after-exercise fatigue may suggest a preserved muscle function. Overall, such studies show the maintenance (based on baseline values) of muscle function by a smaller decre- ment of performance (or none) in specific muscular tests performed after the exercise protocol (e.g., running time- trial, soccer match). On the same reasoning, the lower per- ceived muscle soreness found in the current review is also a potential beneficial outcome from CS. The smaller muscle soreness may be particularly relevant for more prolonged periods with multiples exhausting physical activities per- formed with a short recovery period in-between.17 In one of the studies, competitive runners (VO2max ~69 mL.kg.min) completed four 10 km time-trial wearing control CS (0 mm Hg) and CS with different pressures in a randomized, counterbalanced order.11 The runners per- formed CMJ tests before and after running as a muscle func- tion indicator. The results showed that CMJ height decreased after control running. However, CMJ performance was improved after running wearing CS (low and medium pres- sure), suggesting a better maintainance of muscle function. Table 2 (Continued). Study Potential Benefited Variable Summary Effects from CS No Effects from CS Varela-Sanz et al 201126 (experiment 2) Acute lower cardiac stress CS resulted in lower cardiac stress during a test at competition pace, but none effects for performance and other physiological and perceptual indicators Lower HR response during a test at competition pace (ie, 105% best 10 km run) Time to fatigue HRpeak Blood lactate RPE VO2 peak speed %VO2 max Running economy Zadow et al 201829 Lower fibrinolytic activity CS significantly reduced post- marathon fibrinolytic activityLower D-Dimer concentrations post-marathon Marathon finishing times Thrombin–anti-thrombin complex tissue factor Tissue factor pathway inhibitor Notes: **Time under load means the maximal amount of minutes performed at a submaximal speed (ie, 9 to 11 km.h−1) to ensure over 30 mins running. Abbreviations: CMJ, countermovement jumps; CS, compression stockings; ES Cohen’s d, effect size; HR, heart rate; MVC, maximal voluntary contraction; RPE, rating of perceived exertion; TT, time-trial. Dovepress Mota et al Open Access Journal of Sports Medicine 2020:11 submit your manuscript | www.dovepress.com DovePress 39 Leonardo Sampaio Araujo - lsampaio995@gmail.com - CPF: 061.974.667-08 http://www.dovepress.com http://www.dovepress.com The authors speculated that improvements in proprioception to jump and reduced muscle oscillations due to CS probably collaborated with lower muscle fatigue.11 In other included study, highly trained runners partici- pated in 3 simulated trail races (15.6 km, including uphill and downhill) in a randomized crossover trial.14 Authors measured indicators of muscle function (and also muscle perceived soreness) at baseline, 1, 24, and 48 h after-run. Muscle function decreased after the race, suggesting the appearance of fatigue, which was partially counteracted by CS. More specifically, a beneficial effect from wearing CS was found for isometric peak torque at 1 h and 24 h post- run and for CMJ throughout the 48 h recovery period. Perceived muscle soreness was also lower when runners wore CS during trail running compared with the control condition (1 h and 24 h post-run). Specific muscle con- tractions during trail running (e.g., eccentric on the down- hill portion) might result in more extensive muscle oscillation and soreness. Thus, CS probably reduced the perceived muscle soreness due to the higher preservation of muscle function.14 Miyamoto et al20 showed that CS promoted a smaller extent of reduction (- 6.4 ± 8.5% for CS vs. −16.5 ± 9.0% for control) of the evoked triplet torque, after a fatiguing protocol (15 sets X 10 repetitions) of calf-raise exercise. The authors suggested that mitigation of muscle fatigue observed in their study could be related to increased venous flow velocity and prevention of the lowering of the intramuscular pH.20 Positive CS-induced benefits on muscle fatigue was also described after a soccer match. Female players of both teams (50% each team, randomly wore CS or control socks) performed tests (agility T, standing heel-rise, and YoYo Intermittent Endurance II) 48 h before (baseline) and immediately after the game. CS resulted in less match- induced fatigue for agility T-test performance (maintenance for CS and decrement in control players) and heel-rise test (both groups had a decrement on the number of repetitions, but higher in control).21 In the current review, some researchers found a beneficial CS-effect on the perceived muscle soreness in lower extremities after the following exercises: high- intensity continuous 10 km road-running,10 15.6 km trail in mountainous terrain,14 in the second match of soccer (72 h between the first game),17 and 24 h post 5 km time- trial.25 Overall, those studies suggested a lower perception of muscle soreness due to less extensive muscle damage (lower muscle oscillation), and better proprioception. However, we cannot rule out a potential placebo effect, once it is hard to control such bias due to the nature of compressive CS versus control socks. CS, Other Potential Benefits, and Final Considerations Besides performance, muscle soreness, and muscle function indicators, 15 out of the 21 studies selected in this review presented other variables influenced by CS: lower blood lactate levels,13,22,23 and fibrinolytic activity,29 higher oxy- gen saturation,19 after the exercise protocol (recovery). Also, lower cardiac stress during exercise has been found.26 Mitigation of exercise-induced muscle damage is a possible effect according to authors that found benefit from wearing CS in this review. However, none of them measured blood markers of muscle damage (e.g., creatine kinase - CK, lactate dehydrogenase - LDH). Curiously, only three studies measured such markers after-exercise: a marathon race,12 a 15.6 km trail-running,14 and half- ironman triathlon competition,16 and found no effect from CS. The lack of measurements of muscle damage markers on several studies herein included may be due to the experimen- tal design and the fact of “only” wearing the CS during the exercise (i.e., more focus on performance than recovery). Longer time-points of measurement after the activity (e.g., time-course of CK for at least 24 h after-exercise) could be necessary to detect a significant change in CK,38 for example. Finally, we highlight that in a real-world scenario, ath- letes probably will not use a promising ergogenic aid to improve performance (e.g., CS) only once, as the majority of studies included here. Athletes would perhaps try it in a couple of training session and one competition before to make a final decision. Also, in practical terms, athletes usually may combine different strategies to improve perfor- mance and later recovery, such as ischemic preconditioning,39,40 myofascial release, and cold water immersion.41 Currently, the effects of such strategies (iso- lated or combined) with CS are unknown. Therefore, the interpretation of our findings should have in mind “to see also the forest, not just the leaf”. Conclusions Wearing below-knee CS during exercise (or sport/physical activity) improved the actual performance in a small number of the studies analyzed. However, there is some evidence that wearing CS could benefit muscle fatigue indicators and mus- cle soreness immediately after and hours after an exercise Mota et al Dovepress submit your manuscript | www.dovepress.com DovePress Open Access Journal of Sports Medicine 2020:1140 Leonardo Sampaio Araujo - lsampaio995@gmail.com - CPF: 061.974.667-08 http://www.dovepress.com http://www.dovepress.com bout (e.g., better recovery until 48 h). Lower muscle fatigue andmuscle soreness might be helpful in subsequent exercises or more extended periods of intervention (e.g., several months). Thus, Sports Medicine professionals should con- sider the individual responses for performance and a potential placebo (or nocebo) effect. Future studies should evaluate longer experimental designs (e.g., several weeks) wearing CS on exercise performance and physiological indi- cators, once the chronic effects are unknown. Disclosure The authors report no conflicts of interest in this work. References 1. 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