Abstract

The influence of prior exercise state on the kinetics of VO2, VE, and HR was studied in six subjects. The exercise conditions tested were square wave incre ases in work rate from rest to 80 of the work rate at anaerobic threshold (AT), from O W loadless pedaling to 80 AT, from rest to 40 AT, and from 40 to 80 AT. The kinetic response was evaluated by the time constant (r) and mean response time (MRT = time to achive 63 response) as determined by nonlinear regression. For both VO2 and HR, r and MRT were not significantly different in the rest or O W to 80 AT tests, but were significantly faster in the rest to 40 AT test and significantly slower in the 40 to 80 AT test than the rest and O W to 80 AT tests. The r for VE was significantly slower in the 40 to 80 AT tests than in the other tests. The coincident variation of HR and VO2 kinetics is taken as support for the hypothesis that VO2 kinetics are controlled by oxygen transport. Evidence from the literature that supports both the oxygen transport and the oxygen utilization for the control of VO2 kinetics is reviewed. Verf.-Referat