Heat acclimation improves intermittent sprinting in the heat but additional pre-cooling offers no further ergogenic effect

被引:50
作者
Castle, Paul [1 ]
Mackenzie, Richard W. [2 ]
Maxwell, Neil [3 ]
Webborn, Anthony D. J. [4 ]
Watt, Peter W. [3 ]
机构
[1] Univ Bedfordshire, Dept Sport & Exercise Sci, Bedford MK41 9EA, England
[2] Univ Westminster, Dept Human Biosci, London W1R 8AL, England
[3] Univ Brighton, Chelsea Sch, Eastbourne, England
[4] Univ Brighton, Sussex Ctr Sports & Exercise Med, Eastbourne, England
关键词
Adaptation; hyperthermia; heat stress protein 70; repeated sprint performance; thermoregulation; EXERCISE PERFORMANCE; MUSCLE METABOLISM; INTENSITY; STRESS; INDUCTION; TEMPERATURE; RESPONSES; HUMANS; STRAIN; DECAY;
D O I
10.1080/02640414.2011.583673
中图分类号
G8 [体育];
学科分类号
04 ; 0403 ;
摘要
The aim of this study was to determine the effect of 10 days of heat acclimation with and without pre-cooling on intermittent sprint exercise performance in the heat. Eight males completed three intermittent cycling sprint protocols before and after 10 days of heat acclimation. Before acclimation, one sprint protocol was conducted in control conditions (21.8 +/- 2.2 degrees C, 42.8 +/- 6.7% relative humidity) and two sprint protocols in hot, humid conditions (33.3 +/- 0.6 degrees C, 52.2 +/- 6.8% relative humidity) in a randomized order. One hot, humid condition was preceded by 20 min of thigh pre-cooling with ice packs (-16.2 +/- 4.5 degrees C). After heat acclimation, the two hot, humid sprint protocols were repeated. Before heat acclimation, peak power output declined in the heat (P<0.05) but pre-cooling prevented this. Ten days of heat acclimation reduced resting rectal temperature from 37.8 +/- 0.3 degrees C to 37.4 +/- 0.3 degrees C (P<0.01). When acclimated, peak power output increased by similar to 2% (P<0.05, main effect) and no reductions in individual sprint peak power output were observed. Additional pre-cooling offered no further ergogenic effect. Unacclimated athletes competing in the heat should pre-cool to prevent reductions in peak power output, but heat acclimate for an increased peak power output.
引用
收藏
页码:1125 / 1134
页数:10
相关论文
共 34 条
[1]   THE INDUCTION AND DECAY OF HEAT ACCLIMATIZATION IN TRAINED ATHLETES [J].
ARMSTRONG, LE ;
MARESH, CM .
SPORTS MEDICINE, 1991, 12 (05) :302-312
[2]   URINARY INDEXES OF HYDRATION STATUS [J].
ARMSTRONG, LE ;
MARESH, CM ;
CASTELLANI, JW ;
BERGERON, MF ;
KENEFICK, RW ;
LAGASSE, KE ;
RIEBE, D .
INTERNATIONAL JOURNAL OF SPORT NUTRITION, 1994, 4 (03) :265-279
[3]   Cooling vest worn during active warm-up improves 5-km run performance in the heat [J].
Arngrímsson, SA ;
Petitt, DS ;
Stueck, MG ;
Jorgensen, DK ;
Cureton, KJ .
JOURNAL OF APPLIED PHYSIOLOGY, 2004, 96 (05) :1867-1874
[4]  
BORG G, 1970, Scandinavian Journal of Rehabilitation Medicine, V2, P92
[5]  
Buckley BA, 2002, J EXP BIOL, V205, P3231
[6]   Is active sweating during heat acclimation required for improvements in peripheral sweat gland function? [J].
Buono, Michael J. ;
Numan, Travis R. ;
Claros, Ryan M. ;
Brodine, Stephanie K. ;
Kolkhorst, Fred W. .
AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY, 2009, 297 (04) :R1082-R1085
[7]   Acclimation to humid heat lowers resting core temperature [J].
Buono, MJ ;
Heaney, JH ;
Canine, KM .
AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY, 1998, 274 (05) :R1295-R1299
[8]   Precooling leg muscle improves intermittent sprint exercise performance in hot, humid conditions [J].
Castle, PC ;
Macdonald, AL ;
Philp, A ;
Webborn, A ;
Watt, PW ;
Maxwell, NS .
JOURNAL OF APPLIED PHYSIOLOGY, 2006, 100 (04) :1377-1384
[9]   CALCULATION OF PERCENTAGE CHANGES IN VOLUMES OF BLOOD, PLASMA, AND RED-CELLS IN DEHYDRATION [J].
DILL, DB ;
COSTILL, DL .
JOURNAL OF APPLIED PHYSIOLOGY, 1974, 37 (02) :247-248
[10]   Elevations in core and muscle temperature impairs repeated sprint performance [J].
Drust, B ;
Rasmussen, P ;
Mohr, M ;
Nielsen, B ;
Nybo, L .
ACTA PHYSIOLOGICA SCANDINAVICA, 2005, 183 (02) :181-190