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Induced lactacidemia does not affect postexercise O2 consumption.

D A Roth1, W C Stanley, G A Brooks

  • 1Department of Physical Education, University of California, Berkeley 94720.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|September 1, 1988
PubMed
Summary
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Circulatory occlusion during exercise significantly increased blood lactate and altered oxygen consumption (VO2) kinetics. However, it did not affect the overall recovery VO2, suggesting lactate accumulation doesn't impact the slow component of postexercise oxygen uptake.

Area of Science:

  • Exercise Physiology
  • Metabolic Responses
  • Cardiovascular Regulation

Background:

  • Postexercise oxygen consumption (VO2) and blood lactate are key indicators of metabolic recovery.
  • Understanding the influence of circulatory dynamics on these responses is crucial for exercise science.

Purpose of the Study:

  • To investigate the impact of circulatory occlusion on the time course and magnitude of postexercise VO2 and blood lactate.
  • To determine if elevated blood lactate levels due to occlusion affect the recovery VO2 kinetics.

Main Methods:

  • Nine male subjects performed cycle ergometry with and without leg blood flow occlusion during exercise.
  • Blood lactate and respiratory gas exchange (VO2) were measured during rest, exercise, and recovery.
  • Occlusion was applied for 2 minutes during a 12-minute exercise bout.

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Main Results:

  • Circulatory occlusion significantly elevated blood lactate levels during and after exercise compared to control.
  • VO2 was lower during exercise with occlusion but transiently higher immediately post-exercise.
  • Neither total nor excess recovery VO2 was significantly different between occlusion and control conditions.

Conclusions:

  • While circulatory occlusion alters VO2 and lactate kinetics, it does not significantly change the overall recovery VO2.
  • The slow component of recovery VO2 is not significantly affected by exercise-induced elevations in blood lactate.