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A multi-stage ultra-endurance run over 1,200 km leads to a continuous accumulation of total body water


Knechtle, B; Duff, B; Schulze, I; Kohler, G (2008). A multi-stage ultra-endurance run over 1,200 km leads to a continuous accumulation of total body water. Journal of Sports Science and Medicine, 7(3):357-364.

Abstract

We determined whether ultra-runners in a multi-stage ultra-endurance run lose body mass, fat mass, skeletal muscle mass or total body water in a descriptive field study at the 'Deutschlandlauf' 2007 a 1,200 km run within 17 consecutive days with 10 male non-professional Caucasian ultra-runners (mean +/- SD, 43.8 +/- 6.2 years, 73.8 +/- 6.0 kg body mass, 1.77 +/- 0.05 m body height, BMI 23.3 +/- 1.8 kg.m(-2)). Body mass, fat mass, skeletal muscle mass, lean body mass and percent total body water were determined using bioelectrical impedance analysis and the anthropometric method before the race and after each stage. In addition, urinary specific gravity was measured in order to quantify hydration status. Fat mass (bioelectrical impedance analysis) decreased by 3.9 kg (p < 0.05), skeletal muscle mass (anthropometric method) decreased by 2.0 kg (p < 0.05) whereas percent total body water increased by 6.1 % (p < 0.05) by the end of the race. Ultra-runners in a multi-stage ultra-endurance event over 1,200 km, with 17 consecutive stages, showed a cumulative increase in percent total body water, a decrease in skeletal muscle mass and a decrease in fat mass, depending upon the method used. We presume that the eccentric component of running leads to damage of skeletal muscle, leading to rhabdomyolysis, with impaired renal function.

Abstract

We determined whether ultra-runners in a multi-stage ultra-endurance run lose body mass, fat mass, skeletal muscle mass or total body water in a descriptive field study at the 'Deutschlandlauf' 2007 a 1,200 km run within 17 consecutive days with 10 male non-professional Caucasian ultra-runners (mean +/- SD, 43.8 +/- 6.2 years, 73.8 +/- 6.0 kg body mass, 1.77 +/- 0.05 m body height, BMI 23.3 +/- 1.8 kg.m(-2)). Body mass, fat mass, skeletal muscle mass, lean body mass and percent total body water were determined using bioelectrical impedance analysis and the anthropometric method before the race and after each stage. In addition, urinary specific gravity was measured in order to quantify hydration status. Fat mass (bioelectrical impedance analysis) decreased by 3.9 kg (p < 0.05), skeletal muscle mass (anthropometric method) decreased by 2.0 kg (p < 0.05) whereas percent total body water increased by 6.1 % (p < 0.05) by the end of the race. Ultra-runners in a multi-stage ultra-endurance event over 1,200 km, with 17 consecutive stages, showed a cumulative increase in percent total body water, a decrease in skeletal muscle mass and a decrease in fat mass, depending upon the method used. We presume that the eccentric component of running leads to damage of skeletal muscle, leading to rhabdomyolysis, with impaired renal function.

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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
Language:English
Date:September 2008
Deposited On:06 Feb 2009 09:22
Last Modified:05 Apr 2016 12:57
Publisher:University of Uludag
ISSN:1303-2968
Official URL:http://www.jssm.org/vol7/n3/7/v7n3-7abst.php

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