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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-33316

Knechtle, B; Baumann, B; Wirth, A; Knechtle, P; Rosemann, T (2010). Male ironman triathletes lose skeletal muscle mass. Asia Pacific Journal of Clinical Nutrition, 19(1):91-97.

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We investigated whether male triathletes in an Ironman triathlon lose body mass in the form of fat mass or skeletal muscle mass in a field study at the Ironman Switzerland in 27 male Caucasian non-professional Ironman triathletes. Pre- and post-race body mass, fat mass and skeletal muscle mass were determined. In addition, total body water, hematological and urinary parameters were measured in order to quantify hydration status. Body mass decreased by 1.8 kg (p< 0.05), skeletal muscle decreased by 1.0 kg (p< 0.05) whereas fat mass showed no changes. Urinary specific gravity, plasma urea and plasma volume increased (p< 0.05). Pre- to post-race change (Delta) in body mass was not associated with ? skeletal muscle mass. Additionally, there was no association between Delta plasma urea and Delta skeletal muscle mass; Delta plasma volume was not associated with Delta total body water (p< 0.05). We concluded that male triathletes in an Ironman triathlon lose 1.8 kg of body mass and 1 kg of skeletal muscle mass, presumably due to a depletion of intramyocellular stored glycogen and lipids.


17 citations in Web of Science®
20 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Institute of General Practice
Dewey Decimal Classification:610 Medicine & health
Date:March 2010
Deposited On:09 Apr 2010 11:40
Last Modified:05 Apr 2016 14:05
Publisher:HEC Press
Additional Information:2 Jahre Sperrfrist
Free access at:Official URL. An embargo period may apply.
Official URL:http://apjcn.nhri.org.tw/
PubMed ID:20199992

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