Perceptual and Physiological Responses during Exercise in Cool and Cold Water.

摘要

This investigation examined the interaction of exposure to cold water stress with both perceived exertion and thermal sensation during exercise. Eight male volunteers performed arm, leg and combined arm and leg exercise for 45 min in water at 20 and 26 C. Exercise was performed at a low (n = 7) and a high (n = 8) intensity relative to the ergometer specific peak oxygen uptake (VO2 peak). In general, percent VO2 peak did not differ (p > 0.05) between type of exercise in either 20 or 26 C water. During low intensity exercise when power output was matched across water temperature (T sub w), percent VO2 peak was greater (P 0.05) between T sub w. During high intensity exercise when percent VO2 peak was matched across T sub w, RPE was low (P < 0.01) during exercise in 20 C (X = 12.9) compared to 26C (X = 13.9). Multiple correlation analyses comparing both final RPE and thermal sensation (TS) with physiological and thermal measures were performed across type of exercise and T sub w. These data suggest that the change in oxygen uptake associated with exercise in cold water does not add to the overall perception of exertion. This perception appears to be related to cardiopulmonary variables rather than thermal measures, whereas thermal sensation is related to thermal measures and not cardiopulmonary variables. Keywords: Relative oxygen uptake; Water immersion; Rectal temperature; Skin temperature; Heart rate; Ventilation.