Oxygen uptake kinetics in trained athletes differing in \(\dot V_{{\text{O}}_{{\text{2max}}} }\)

  • Scott K. Powers
  • Stephen Dodd
  • Ralph E. Beadle
Article

Summary

Previous work has shown that when \(\dot V_{{\text{O}}_{\text{2}} }\) kinetics are compared for endurance trained athletes and untrained subjects, the highly trained athletes have a faster response time. However, it remains to be determined whether the more rapid adjustment of \(\dot V_{{\text{O}}_{\text{2}} }\) toward steady state in athletes is due to \(\dot V_{{\text{O}}_{{\text{2max}}} }\) differences or training adaptation alone. One approach to this problem is to study the time course of \(\dot V_{{\text{O}}_{\text{2}} }\) kinetics at the onset of work in athletes who differ in \(\dot V_{{\text{O}}_{{\text{2max}}} }\) but have similar training habits. Therefore, the purpose of these experiments was to compare the time course of \(\dot V_{{\text{O}}_{\text{2}} }\) kinetics at the onset of exercise in athletes with similar training routines but who differ in \(\dot V_{{\text{O}}_{{\text{2max}}} }\). Ten subjects (\(\dot V_{{\text{O}}_{{\text{2max}}} }\) range 50–70 ml · kg−1 · min−1) performed 6-minutes of cycle ergometer exercise at ∼50% \(\dot V_{{\text{O}}_{{\text{2max}}} }\). Ventilation and gas exchange were monitored by open circuit techniques. The data were modeled with a single component exponential function incorporating a time delay, (T D ); \(\Delta \dot V_{{\text{O}}_{{\text{2}}f} } = \Delta \dot V_{{\text{O}}_{2ss} } {\text{ (1}} - e^{ - t - T_D /_{\tau )} }\), where Τ is the time constant \(\Delta \dot V_{{\text{O}}_{{\text{2}}f} }\) is the increase in \(\dot V_{{\text{O}}_{\text{2}} }\) at time t and \(\Delta \dot V_{{\text{O}}_{{\text{2ss}}} }\) is the steady-rate increment above resting \(\dot V_{{\text{O}}_{\text{2}} }\). Kinetic analysis revealed a range of \(\dot V_{{\text{O}}_{\text{2}} }\) half times from 21.6 to 36.0 s across subjects with a correlation coefficient of r=−0.80 (p<0.05) between \(\dot V_{{\text{O}}_{{\text{2max}}} }\) and \(\dot V_{{\text{O}}_{\text{2}} }\) half time. These data suggest that in highly trained indicivuals with similar training habits, those with a higher \(\dot V_{{\text{O}}_{{\text{2max}}} }\) achieve a more rapid \(\dot V_{{\text{O}}_{\text{2}} }\) adjustment at the onset of work.

Key words

Oxygen uptake kinetics \(\dot V_{{\text{O}}_{{\text{2max}}} }\) Exercise metabolism Trained athletes Gas exchange 

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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • Scott K. Powers
    • 1
  • Stephen Dodd
    • 1
  • Ralph E. Beadle
    • 1
  1. 1.Applied Physiology Laboratory, School of HPERDLouisiana State UniversityBaton RougeUSA

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