Thermal Responses During Arm, Leg and Combined Arm and Leg Exercise in Water at 20, 26 and 33 deg C,
ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
Pagination or Media Count:
Thermal and metabolic responses were examined during exposures in stirred water at approximately 20, 26 and 33 degrees C while performing 45 min of either arm A, leg L, or combined arm and leg AL exercise. Eight males immersed to the neck completed a low exercise intensity for A exercise and both a low and high exercise intensity for L and AL exercise. During low intensity exercise, final metabolic rate M for A, L, and AL exercise was not different por0.05 between exercise type for each water temperature T sub w. In contrast, final rectal temperatures T sub re for A and AL exercise were significantly lower than L values for each T sub w during low intensity exercise. These findings were supported by both mean weighted skin temperature T sub skand final mean weighted heat flow HC values which were greater during A than L for each T sub w. During high intensity exercise, final T sub re values were lower por0.05 during AL compared with L exercise across all T sub w. Final T sub sk and HC values were not different between each type of exercise although M was significantly lower during L exercise in 20 degrees C water. These data suggest a greater conductive and convective heat loss during exercise utilizing the arms when compared with leg only exercise.
- Stress Physiology