Abstract
Physiological responses of the human body for four different exercises were examined in this study. Exercises consisted of arm and leg exercises in the supine and sitting postures. Ten untrained female subjects performed 15 minutes of exercise at 50% of maximal oxygen intake (VO_2Pmax), which of each subject for each kind of exercise was decided by use of a bicycle ergometer in each exercise condition. Exercises were carried out in a climatic chamber under environmental conditions of 30℃ and 50% relative humidity. Metabolic rate (MR), Heart rate (HR), rectal temperature (Tre) and mean skin temperature (Tsk) during exercise were measured. It was found that VO_2Pmax in the sitting posture was 20〜24% higher than that in the supine posture, and VO_2Pmax for the leg exercise was 25〜30% higher than that for the arm exercise. The results between physiological responses and MR during exercises were summarized as follows: (1) HR showed an almost linear relationship with MR irrespective of the kind of exercise. (2) Tre increased with MR as well with as HR with an exceptional tendency to rise during the supine leg exercise. (3) Changes in Tsk had no relationship to MR. The reason for this will be the focus of the following study.
