Cardiovascular and oxygen uptake kinetics during sequential heavy cycling exercises

Stéphane Perrey, Jodie Scott, Laurent Mourot, Jean Denis Rouillon

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The purpose of the present study was to assess the relationship between the rapidity of increased oxygen uptake (V̇O2) and increased cardiac output (CO) during heavy exercise. Six subjects performed repeated bouts on a cycle ergometer above the ventilatory threshold (∼80% of peak V̇O2) separated by 10-min recovery cycling at 35% peak V̇O2. V̇O2 was determined breath-by-breath and CO was determined continuously by impedance cardiography. CO and V̇O 2 values were significantly higher during the 2-min period preceding the second bout. The overall responses for V̇O2 and CO were significantly related and were faster during the second bout. Prior heavy exercise resulted in a significant increase in the amplitude of the fast component of V̇O2, with no change in the time constant and a decrease in the slow component. Under these circumstances, the amplitude of the fast component was more sensitive to prior heavy exercise than was the associated time constant.

Original languageEnglish
Pages (from-to)283-298
Number of pages16
JournalCanadian Journal of Applied Physiology
Volume28
Issue number2
DOIs
Publication statusPublished - 1 Jan 2003
Externally publishedYes

Keywords

  • Cardiac output
  • Exercise transitions
  • Impedance cardiography
  • Prior exercise

ASJC Scopus subject areas

  • Physiology
  • Orthopedics and Sports Medicine

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