RESPONSE OF OXYGEN UPTAKE, HEART RATE, AND VENTILATION TO SUBMAXIMAL ARM, LEG, AND “ARM+LEG” EXERCISE / 体力科学

ABSTRACT

The effect of submaximal arm, leg, and“arm+leg”exercise on oxygen uptake (VO<SUB>2</SUB>), heart rate (HR), and pulmonary ventilation (V<SUB>E</SUB>) was studied in three male subjects. The“arm+leg”exercise was performed in ten different ways with different arm load ranging from 14 to 60% of the total work load. VO<SUB>2</SUB> and V<SUB>E</SUB> were found higher in the arm exercise than in the other types of exercise at submaximal work. At a given work load, the lowest HR was observed in the“arm+leg”exrcise when the arm was loaded with 14 to 33% of the total work load. And the highest HR was obtained in the arm exercise. The higher HR during the arm exercise as compared to the legor“arm + leg”exercise may be accounted for by the fact that an exercise with small muscle group appears to elicit lower stroke volume and more pronounced rise in sympathetic tone. In the“arm + leg”exercise, HR at a given work load or VO<SUB>2</SUB> varied with the proportion of arm load. However V<SUB>E</SUB>, whcih might be affected by stroke volume, was unaffected by the rate of arm to the total work load at a given work load or VO<SUB>2</SUB>. This indicates that the sympathetic tone may be affected by the proportion of work load distribution on the active msucle groups in the“arm + leg”exercise.