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Phlebotomy eliminat...
Phlebotomy eliminates the maximal cardiac output response to six weeks of exercise training
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Bonne, T. C. (author)
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Doucende, G. (author)
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Fluck, D. (author)
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Jacobs, R. A. (author)
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Nordsborg, N. B. (author)
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Robach, P. (author)
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Walther, G. (author)
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- Lundby, Carsten (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kost- och idrottsvetenskap,Department of Food and Nutrition, and Sport Science
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(creator_code:org_t)
- American Physiological Society, 2014
- 2014
- English.
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In: American Journal of Physiology-Regulatory Integrative and Comparative Physiology. - : American Physiological Society. - 0363-6119 .- 1522-1490. ; 306:10
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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Abstract
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- With this study we tested the hypothesis that 6 wk of endurance training increases maximal cardiac output (Q(max)) relatively more by elevating blood volume (BV) than by inducing structural and functional changes within the heart. Nine healthy but untrained volunteers (Vo(2max) 47 +/- 5 ml.min(-1).kg(-1)) underwent supervised training (60 min; 4 times weekly at 65% Vo(2max) for 6 wk), and Q(max) was determined by inert gas rebreathing during cycle ergometer exercise before and after the training period. After the training period, blood volume (determined in duplicates by CO rebreathing) was reestablished to pretraining values by phlebotomy and Q(max) was quantified again. Resting echography revealed no structural heart adaptations as a consequence of the training intervention. After the training period, plasma volume (PV), red blood cell volume (RBCV), and BV increased (P < 0.05) by 147 +/- 168 (5 +/- 5%), 235 +/- 64 (10 +/- 3%), and 382 +/- 204 ml (7 +/- 4%), respectively. Vo(2max) was augmented (P < 0.05) by 10 +/- 7% after the training period and decreased (P < 0.05) by 8 +/- 7% with phlebotomy. Concomitantly, Q(max) was increased (P < 0.05) from 18.9 +/- 2.1 to 20.4 +/- 2.3 l/min (9 +/- 6%) as a consequence of the training intervention, and after normalization of BV by phlebotomy Q(max) returned to pretraining values (18.1 +/- 2.5 l/min; 12 +/- 5% reversal). Thus the exercise training-induced increase in BV is the main mechanism increasing Q(max) after 6 wk of endurance training in previously untrained subjects.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Hälsovetenskap -- Idrottsvetenskap (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Health Sciences -- Sport and Fitness Sciences (hsv//eng)
Keyword
- adaptations
- blood
- cardiac output
- Q
- training
Publication and Content Type
- ref (subject category)
- art (subject category)
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