Factors determining training-induced changes in V̇O2max, critical power, and V̇O2 on-kinetics in skeletal muscle

Abstract

A mechanism of the training-induced changes in V̇O2max, critical power, and V̇O2 on-kinetics in skeletal muscle reported in the literature is postulated. It involves the self-driving “Pi double-threshold” mechanism of muscle fatigue underlying exercise inefficiency, the slow component of the V̇O2 on-kinetics, and termination of exercise. It is proposed that an increase in OXPHOS activity and decrease in peak Pi at which exercise terminates are responsible for the training-induced changes in the muscle bioenergetic system.