White Andrea T, Davis Scott L, Wilson Thad E
Department of Exercise and Sport Science, University of Utah, Salt Lake City, Utah 84112, USA.
J Appl Physiol (1985). 2003 Mar;94(3):1039-44. doi: 10.1152/japplphysiol.00720.2002. Epub 2002 Nov 8.
The purpose of this investigation was to compare the thermoregulatory, metabolic, and perceptual effects of lower body (LBI) and whole body (WBI) immersion precooling techniques during submaximal exercise. Eleven healthy men completed two 30-min cycling bouts at 60% of maximal O(2) uptake preceded by immersion to the suprailiac crest (LBI) or clavicle (WBI) in 20 degrees C water. WBI produced significantly lower rectal temperature (T(re)) during minutes 24-30 of immersion and lower T(re), mean skin temperature, and mean body temperature for the first 24, 14, and 16 min of exercise, respectively. Body heat storage rates differed significantly for LBI and WBI during immersion and exercise, although no net differences were observed between conditions. For WBI, metabolic heat production and heart rate were significantly higher during immersion but not during exercise. Thermal sensation was significantly lower (felt colder) and thermal discomfort was significantly higher (less comfortable) for WBI during immersion and exercise. In conclusion, WBI and LBI attenuated T(re) increases during submaximal exercise and produced similar net heat storage over the protocol. LBI minimized metabolic increases and negative perceptual effects associated with WBI.
本研究的目的是比较次最大强度运动期间下半身（LBI）和全身（WBI）浸入式预冷技术对体温调节、代谢和感知的影响。11名健康男性在最大摄氧量60%的情况下完成了两次30分钟的骑行运动，运动前分别将其浸入20摄氏度的水中至髂嵴上方（LBI）或锁骨（WBI）水平。WBI在浸入的第24 - 30分钟期间直肠温度（T(re)）显著降低，在运动的前24、14和16分钟时，T(re)、平均皮肤温度和平均体温分别更低。尽管两种条件下未观察到净差异，但LBI和WBI在浸入和运动期间的身体蓄热率存在显著差异。对于WBI，浸入期间代谢产热和心率显著更高，但运动期间并非如此。在浸入和运动期间，WBI的热感觉显著更低（感觉更冷），热不适显著更高（更不舒服）。总之，WBI和LBI在次最大强度运动期间减弱了T(re)的升高，并且在整个实验过程中产生了相似的净蓄热。LBI将与WBI相关的代谢增加和负面感知效应降至最低。
