Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine ( 2004 ) 03 , 50 - 55

Young Investigator Special Issue 1: Research article
Exercise-Induced Hypervolemia may not be Consequential to Dehydration During Exercise
Bartholomew Kay, Brendan J. O’Brien , Nicholas D. Gill
Author Information
Waikato Institute of Technology, Centre for Sport and Exercise Science, Hamilton, New Zealand

Brendan J. O’Brien
✉ Waikato Institute of Technology, Centre for Sport and Exercise Science, Private Bag 3036, Hamilton 2020, New Zealand
Email: Brendan.obrine@wintec.ac.nz
Publish Date
Received: 06-05-2004
Accepted: 04-10-2004
Published (online): 01-11-2004
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ABSTRACT

The purpose of this investigation was to determine whether the increase in plasma volume (PV) frequently observed 24 hours after exercise is proportional to the magnitude of dehydration occurring during exercise. Seven males (age 21.6 ± 4.4 y, body mass 71.5 ± 8.5 kg; VO2peak 43 ± 7 mL·kg·minute-1, peak 60-second cycling power output 282 ± 16 W) completed three cycling sessions at 50% of peak power output in an ambient environment of 35oC, 50% relative humidity; with the exercise lasting either 30, 60 or 90 minutes (in random order) to elicit varying levels of dehydration (assessed by body mass changes). The percent change in PV was calculated 24 hours after each exercise session. All exercise sessions were separated by 7-days. Participants’ body mass (means ± SD) decreased by 1.03 ± 0.22% in the 30-minute exercise protocol; 1.43 ± 0.26% in the 60-minute protocol; and 1.59 ± 0.37% in the 90-minute protocol. Significant PV expansions were not evident 24 hours after any protocol (0.76 ± 4.58% in the 30-minute protocol; 1.40 ± 4.58% in the 60-minute protocol, and 2.92 ± 3.2% in the 90-minute protocol). Regression analysis revealed a poor correlation between percent dehydration and percent change in plasma volume (r = 0.24). Our study revealed that the magnitude of dehydration elicited during this study was insufficient to stimulate a significant expansion in PV.

Key words: Exercise, dehydration, fluid volume, blood volume


           Key Points
  • It may be advantageous to prolong or accentuate the hypotension following exercise by postural manipulation or delaying hydration to evoke a significant and observable increase in PV.
  • A greater understanding of the stimulus of exercise-induced hypervolemia is required by exercise physiologists if they are to prescribe appropriate strategies to evoke hypervolemia.
 
 
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