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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-64256

Knechtle, Beat; Knechtle, Patrizia; Wirth, Andrea; Alexander Rüst, Christoph; Rosemann, Thomas (2012). A faster running speed is associated with a greater body weight loss in 100-km ultra-marathoners. Journal of Sports Sciences, 30(11):1131-1140.

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Abstract

Abstract In 219 recreational male runners, we investigated changes in body mass, total body water, haematocrit, plasma sodium concentration ([Na(+)]), and urine specific gravity as well as fluid intake during a 100-km ultra-marathon. The athletes lost 1.9 kg (s = 1.4) of body mass, equal to 2.5% (s = 1.8) of body mass (P < 0.001), 0.7 kg (s = 1.0) of predicted skeletal muscle mass (P < 0.001), 0.2 kg (s = 1.3) of predicted fat mass (P < 0.05), and 0.9 L (s = 1.6) of predicted total body water (P < 0.001). Haematocrit decreased (P < 0.001), urine specific gravity (P < 0.001), plasma volume (P < 0.05), and plasma [Na(+)] (P < 0.05) all increased. Change in body mass was related to running speed (r = -0.16, P < 0.05), change in plasma volume was associated with change in plasma [Na(+)] (r = -0.28, P < 0.0001), and change in body mass was related to both change in plasma [Na(+)] (r = -0.36) and change in plasma volume (r = 0.31) (P < 0.0001). The athletes consumed 0.65 L (s = 0.27) fluid per hour. Fluid intake was related to both running speed (r = 0.42, P < 0.0001) and change in body mass (r = 0.23, P = 0.0006), but not post-race plasma [Na(+)] or change in plasma [Na(+)] (P > 0.05). In conclusion, faster runners lost more body mass, runners lost more body mass when they drank less fluid, and faster runners drank more fluid than slower runners.

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Institute of General Practice
DDC:610 Medicine & health
Language:English
Date:2012
Deposited On:17 Aug 2012 07:21
Last Modified:12 Dec 2013 11:40
Publisher:Taylor & Francis
ISSN:0264-0414
Additional Information:This is an electronic version of an article published in Knechtle, Beat; Knechtle, Patrizia; Wirth, Andrea; Alexander Rüst, Christoph; Rosemann, Thomas (2012). A faster running speed is associated with a greater body weight loss in 100-km ultra-marathoners. Journal of Sports Sciences, 30(11):1131-1140. Journal of Sports Sciences is available online at: www.tandfonline.com/10.1080/02640414.2012.692479
Publisher DOI:10.1080/02640414.2012.692479
PubMed ID:22668199
Citations:Web of Science®. Times Cited: 4
Google Scholar™
Scopus®. Citation Count: 5

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