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Yang Zhang1, Svetlana Nepocatych1, Charlie P. Katica1, Annie B. Collins1, Catalina Casaru1, Gytis Balilionis1, Jesper Sjökvist2, Phillip A. Bishop1

1The University of Alabama, Department of Kinesiology, Tuscaloosa, USA
2The Swedish Olympic Committee, Stockholm, Sweden

Effect of Half Time Cooling on Thermoregulatory Responses and Soccer-Specific Performance Tests

Uticaj hlađenja tokom poluvremena na termoregulaciju i specifične performase fudbalera

Monten. J. Sports Sci. Med. 2014, 3(1), 17-22

Abstract

This study examined two active coolings (forearm and hand cooling, and neck cooling) during a simulated half-time recovery on thermoregulatory responses and subsequent soccer-specific exercise performance. Following a 45-min treadmill run in the heat, participants (N=7) undertook 15-min recovery with either passive cooling, forearm and hand cooling, or neck cooling in a simulated cooled locker room environment. After the recovery, participants performed a 6×15-m sprint test and Yo-Yo Intermittent Recovery Level 1 test (YYIR1) in a temperate environment. During the 15-min recovery, rectal temperature fell significantly (p<0.05). Neither active coolings induced further reduction in rectal temperature compared to passive cooling. No effect of active coolings was found in repeated sprint test. However, neck cooling reduced (p<0.05) the thermal sensation (TS) compared to passive cooling during the 15-min recovery. Active coolings attenuated (p<0.05) the sweat rate compared to passive cooling: 1.2±0.3 l•h-1 vs. 0.8±0.1 l•h-1 vs. 0.8±0.3 l•h-1, for passive cooling, forearm and hand cooling, and neck cooling, respectively. For passive cooling, elevated sweat rate resulted in higher (p<0.05) dehydration (2.1±0.3%) compared to neck cooling (1.5±0.3%) and forearm and hand cooling (1.4±0.3%). YYIR1 was improved (p<0.05) following forearm and hand cooling (869±320 m) and neck cooling (814±328 m) compared to passive cooling (654±311 m). Neck cooling (4.6±0.6) reduced (p=0.03) the session TS compared to passive cooling (5.3±0.5). These results suggest that active coolings effectively improved comfort and sweating response, which delayed exercise-heat induced performance diminish during a second bout of exercise.

Keywords

football, body temperature, ice, immersion, sweating, fatigue

Abstract (MNE)

Ova studija ispituje dvije intervencije hlađenja (aktivnu nasuprot pasivnoj) tokom simulirananog oporavka u poluvremenu na termoregulaciju i kasniji učinak vježbanja. Nakon 45-minutne aktivnosti na pokretnoj traci, ispitanici (N=7) su tretirani 15-minutnim oporavkom, pasivnim hlađenjem podlaktice i šake ili vrata u određenoj prostoriji za ovakve namjene. Nakon oporavka, ispitanici su tretirani 6×15-m sprint testom i Yo-Yo Intermittent Recovery Level 1 testom (YYIR1) u umjereno zagrijanom okruženju. Ni aktivno hlađenje nije izazvalo dalje smanjenje rektalne temperature, niti pasivno. Nije pronađen uticaj aktivnog hlađenja u ponovljenom testu sa sprintovima. Međutim, aktivno hlađenje je izazvalo smanjenje znojenja, toplotni osjećaj (TS) u poređenju sa pasivnim hlađenjem (p<0.05). Kod pasivnog hlađenja, povišeno znojenje je rezultirano na nivou 2.1±0.3% dehidratacije u poređenju sa hlađenjem vrata (1.5±0.3%), podlaktice i šake (1.4±0.3%) (p<0.05). YYIR1 je značajno unaprijeđen (p<0.05) kada je u pitanju hlađenje podlaktice i ruke (869±320m) i hlađenja vrata (814±328m), u poređenju sa pasivnim hlađenjem (654±311m). Navedeni rezultati sugerišu na činjenicu da aktivne intervencije hlađenja efikasno poboljšavaju udobnost i začetak znojenja, koje je bilo usporeno tokom drugog seta vježbi.

Keywords (MNE)

fudbal, tjelesna temperatura, let, potapanje, znojenje, zamor



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