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Related Experiment Videos

Oxygen uptake-work rate relationship during two consecutive ramp exercise tests.

A M Jones1, H Carter

  • 1Department of Exercise and Sport Science, Manchester Metropolitan University, Alsager, United Kingdom. a.m.jones@mmu.ac.uk

International Journal of Sports Medicine
|September 4, 2004
PubMed
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Prior exhaustive ramp exercise improves oxygen uptake efficiency during a second exercise bout. This finding suggests exercise economy is influenced by preceding muscle activity, similar to constant work rate studies.

Area of Science:

  • Exercise Physiology
  • Human Performance
  • Cardiorespiratory Fitness

Background:

  • Prior high-intensity constant work rate (CWR) exercise impacts oxygen uptake (VO2) response during subsequent exercise.
  • The effect of prior exhaustive ramp exercise on subsequent exercise VO2 kinetics is not well understood.

Purpose of the Study:

  • To investigate if a prior bout of exhaustive ramp exercise enhances VO2 kinetics during a subsequent ramp exercise test.
  • To determine if exercise economy, measured by the VO2-work rate (DeltaVO2/DeltaWR) slope, is altered by prior ramp exercise.

Main Methods:

  • Nine healthy males completed two exhaustive ramp exercise tests on a cycle ergometer.
  • Tests were separated by 10 minutes of low-intensity cycling (20 W).
  • Pulmonary VO2, mean response time (MRT), and DeltaVO2/DeltaWR slopes (S1, S2, ST) were measured.

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Main Results:

  • Blood lactate was significantly higher at the start of the second test.
  • No significant difference in baseline VO2 or MRT between tests.
  • The DeltaVO2/DeltaWR slope was significantly steeper in the second ramp test for both the above gas exchange threshold (S2) and total (ST) regions.

Conclusions:

  • Prior exhaustive ramp exercise increases the VO2-work rate slope during subsequent ramp exercise.
  • This demonstrates that exercise economy is sensitive to the prior activity of the engaged muscles.
  • Findings align with previous CWR studies, indicating a consistent effect of prior exercise on VO2 kinetics.