Wearing a Cooling Jacket During Exercise Reduces Thermal Strain and Improves Endurance Exercise Performance in a Warm Environment
- Autores: Hiroshi Hasegawa, Tadashi Takatori, Takashi Komura, Masahiro Yamasaki
- Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 19, Nº. 1, 2005, págs. 122-128
- Idioma: inglés
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Resumen
The aim of the present study was to investigate the effect of wearing a cooling jacket on thermoregulatory responses and endurance exercise performance in a warm environment. Nine untrained male subjects cycled for 60 minutes at 60% V O2max (Ex1) and then immediately exercised to exhaustion at 80% V O2max (Ex2) in 32.0 ± 0.28C and 70-80% relative humidity.
Four separate conditions were set during exercise: no water intake (NW), water intake (W), wearing a cooling jacket (C) and the combination of C and W (C+W). Rectal temperatures (Tre) before Ex1 were not different between the 4 conditions, whereas at the end of Ex1 Tre of C+W was significantly lower than the C and W (p < 0.05). Mean skin temperature (Tsk) was significantly lower in C and C1W than the NW and W during Ex1.
Heart rate of C and C1W were significantly lower than the NW and W, and rating of perceived exertion (RPE) in C+W was lower than in the other conditions. Exercise time to exhaustion was significantly longer in C+W than in the other conditions (NW < W, C < C+W; p < 0.05), whereas Tre at exhaustion was not different. Our results indicate that the combination of wearing a cooling jacket and water intake enhances exercise endurance performance in a warm environment because of a widened temperature margin before the critical limiting temperature is reached and also because of decreased thermoregulatory and cardiovascular strain.
