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Related Experiment Videos

Plasma volume responses to consecutive anaerobic exercise tests

M J Whittlesey1, C M Maresh, L E Armstrong

  • 1University of Connecticut, Department of Sport, Leisure and Exercise Science, Storrs 06269-1110, USA.

International Journal of Sports Medicine
|May 1, 1996
PubMed
Summary

Consecutive Wingate tests caused significant plasma volume reduction (hemoconcentration). An initial test

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Physiology

Background:

  • Plasma volume changes are critical indicators of hydration status and exercise response.
  • Understanding fluid shifts during repeated high-intensity exercise is vital for performance optimization.

Purpose of the Study:

  • To investigate the impact of consecutive Wingate tests on plasma volume changes.
  • To determine if initial hemoconcentration affects subsequent exercise-induced fluid shifts.

Main Methods:

  • Twelve active males performed two Wingate tests (30-second anaerobic power tests) separated by 10 minutes.
  • Blood samples were collected pre- and post-exercise to measure plasma volume (% delta PV).
  • Tests were repeated across three sessions, two weeks apart, with consistent exercise resistance.

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Main Results:

  • A significant hemoconcentration occurred after the first Wingate test (-17.4% delta PV).
  • A further hemoconcentration was observed after the second Wingate test (-8.2% delta PV).
  • Total plasma volume change across both tests was -20.1% delta PV.

Conclusions:

  • Initial hemoconcentration from the first Wingate test may attenuate the plasma volume response to a second, subsequent test.
  • Repeated bouts of supramaximal exercise induce cumulative fluid shifts within the body.