| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1986: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1985: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Research Abstract |
The rate of cardio-respiratory adjustment at the onset of treadmill running was studied in 6 active females (aged 20-22yrs), 5 active males (aged 20-22yrs), and 8 young boys (aged 10-11yrs). The calf blood flow (by mercury-in-rubber strain gauge), Vo2 and heart rate were measured during 5-minute running at 30-sec or 1-minute interval. The data were fitted by non-linear least squares regression to a single component, exponential equation : Yt=C-ae. The results obtained were summarized as follows;
1) Calf blood flow response to treadmill running at 50 %Vo2max in female students was found to be very fast. The mean t1/2 for calf blood flow averaged 11.16 sec, which was significantly shorter than Vo2t1/2 (16.26+6.44 sec) and HRt1/2(16.49+6.44 sec).
2) The t1/2 in children, running at 120m/min, was 13.19 sec for HR and 18.99 sec for Vo2 on the average. A significant difference was found between the two means.
3) The Vo2t1/2 and HRt1/2 in children did not differ from those of adults in running at 120m/min.
4) The calf blood flow at 30-sec during running increased to 90.5% in children, while in adults it was 80.0%. The rate of blood flow increase in children was larger than heart rate; that is 73.8%.
It is concluded from the present study that peripheral circulatory adjustment at the onset of exercise preceded the central circulatory adjustment, judging from HR and calf blood flow response. It is also suggested that the rate of circulatory adjustment in children will be faster compared to adults, which will contribute to the faster Vo2 rise at the onset of exercise in children.
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