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Changes in plasma volume and baroreflex function following resistance exercise

L L Ploutz1, D L Tatro, G A Dudley

  • 1Bionetics Corporation, Florida.

Clinical Physiology (Oxford, England)
|July 1, 1993
PubMed
Summary
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Resistance exercise rapidly decreases plasma volume (PV) within 3 hours, then increases it by 24 hours. Baroreflex sensitivity remained unchanged, suggesting PV shifts occur independently of this response.

Area of Science:

  • Exercise Physiology
  • Cardiovascular Regulation

Background:

  • Previous research documented plasma volume (PV) and baroreflex changes for 24 hours after maximal aerobic exercise.
  • The impact of resistance exercise on these physiological parameters over a similar timeframe remains less understood.

Purpose of the Study:

  • To investigate the changes in plasma volume (PV) and baroreflex sensitivity for 24 hours following a bout of resistance exercise.
  • To determine if PV shifts occur independently of baroreflex alterations after resistance training.

Main Methods:

  • Eight healthy men underwent resistance exercise (bench press, leg press) or a control session.
  • Plasma volume was assessed using hematocrit, hemoglobin, and Evans blue dye at various time points (0-24 hours post-exercise).
  • Carotid baroreceptor-cardiac reflex responses were measured before and at multiple intervals after exercise (3-24 hours).
Keywords:
NASA Center KSCNASA Discipline CardiopulmonaryNASA Discipline Number 14-10NASA Program Space Physiology and Countermeasures

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Main Results:

  • Plasma volume decreased by 20% immediately post-resistance exercise, with rapid recovery within 3 hours.
  • A significant 20% increase in PV was observed 24 hours post-exercise compared to the control day.
  • No significant differences in baroreflex sensitivity were detected at any time point after resistance exercise.

Conclusions:

  • Resistance exercise induces rapid and transient changes in plasma volume.
  • Plasma volume alterations following resistance exercise do not appear to affect baroreflex sensitivity.
  • These findings suggest that cardiovascular adjustments to resistance exercise involve PV shifts independent of baroreflex modulation.