一定負荷運動時の酸素摂取動態の生理的意義

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There have been many studies on pulmonary oxygen uptake (V^^・O_2) kinetics during a constant-load exercise below and above lactate threshold (LT). According to previous studies, V^^・O_2 response to a constant-load exercise is characterized as a three-component exponential model (phase 1, 2 and 3). In particular, much attention have been paied to phase 2 and phase 3 of V^^・O_2 kinetics derived from exercising muscle metabolism. Up to the present, the controlling factors for phase 2 component of V^^・O_2 kinetic seem to reside in an inertia of oxidative metabolism during moderate to heavy intensity exercise, while during severe intensity exercise, O_2 delivery to exercising muscle seems to play a relative minor but significant role. There is another attractive phenomenon related to phase 3 of V^^・O_2 kinetics, so-called V^^・O_2 slow-component. The various mechanisms responsible for the V^^・O_2 slow-component have been proposed, including hyperventilation, lactic acidosis, secretion of catecholamine, elevated body temperature and recruitment of low-efficiency type II muscle fibers. The primary origin of the V^^・O_2 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 recruitment resulted in the V^^・O_2 slow-component, it could be a strong candidate for the V^^・O_2 slow-component. Consequently, further studies should be carried out to clarify as to which mechanism contributes directly to the V^^・O_2 slow-component during heavy exercise.
日本運動生理学会の論文
2004-10-30

一定負荷運動時の酸素摂取動態の生理的意義

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