一定負荷運動時の酸素摂取動態の生理的意義

機関リポジトリ NDLデジタルコレクション HANDLE Web Site 被引用文献1件

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  • イッテイ フカ ウンドウジ ノ サンソ セッシュ ドウタイ ノ セイリテキ イギ
  • Physiological Implications for Pulmonary Oxygen-uptake Kinetics During a Constant-load Exercise

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There have benn many studies on pulmonary oxygen uptake(VO2) kinetics during a coustant-load exercise below and above lactate threshold (LT). Accorbing to previous exponential model (phase 1,2 and 3). In particular, much attention have been paied to the present, the controlling factors for phase2 component of VO2 kinetic seem to reside in an inertia of oxidative metabolism during moderate to heavy intensity exercise, while during severe intensity exercise, O2 delivery to exerising muscle seems to play a relative minor but significant role. There is another attractive phenomenon related to phase 3 of VO2 kinetics, so-called VO2 slow -component. The various mechanisms responsible for the VO2 slow-component have been propsed, including hyperventilation, lactic acidosis, secretion of catecholamine, elevated body temperature and recrutiment of low-efficiency type Ⅱ muscle fibers. The primary origin of the VO2 slow-component has been indicated to be within working limbs (～86%,Poole et. al. 1991). Although there have no direct evidence from previous studies that increased type Ⅱ fiber recruiment resulted in the VO2 slow- component, it could be a strong candidate for the VO2 slow-component. Consequently, further studies should be carried out to clarify as to which mechanism countributes directly to VO2 slow-component during heavy exercise.

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