一定強度の長時間運動中に起こる心周期分画の変動

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タイトル別名
  • SYSTOLIC AND DIASTOLIC TIME INTERVALS DURING PROLONGED EXERCISE OF A CONSTANT INTENSITY
  • イッテイ キョウド ノ チョウジカン ウンドウチュウ ニ オコル シン シュ

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The purpose of this study was to elucidate the changes in systolic and diastolic time intervals which accrue along with increase of HR during a prolonged exercise.<BR>Fifteen male collegiate distance runners performed bicycle ergometer exercise of 70% maximal oxygen intake for 60 minutes. Electrocardiogram, phonocardiogram, pulse wave using ear densitogram and its derivative were recorded throughout the exercise, and then HR, STI, DT (diastolic time) and QS2/DT were caluculated from the tracings.<BR>The results obtained are as follows:<BR>1. At the initial phase of the exercise, DT decreased markedly to result in rapid increase of QS2/DT. When HR was between 130-150 beats/min, however, the rate of decrease of QS2 was greater than that of DT, so QS2/DT showed a tendency to decrease. When HR was more than 150, QS2 reached a plateau but DT still continued to decrease, and QS2/DT turned to increase again.<BR>2. LVET decreased slowly throughout the exercise, whereas PEP decreased rapidly within initial two minutes and kept a steady state thereafter. The change in QS2 after two minutes of exercise seemed to depend on LVET.<BR>3. LVETi and QS2i showed a similar change as that in QS2/DT but the change in QS2i was less obvious than that in LVETi.<BR>4. PEN and PEP/LVET decreased rapidly in the initial two minutes, thereafter they continued to increase more slowly with increase of HR until the end of exercise.<BR>Conclusively, HR continued to increase monotonously during prolonged exercise of a constant intensity, while systolic and diastolic time intervals varied the directions and patterns of their changes during the exercise.

収録刊行物

  • 体力科学

    体力科学 37 (3), 263-272, 1988

    一般社団法人日本体力医学会

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