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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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A MULTI-STAGE ULTRA-ENDURANCE RUN OVER 1,200 KM LEADS TO A CONTINUOUS ACCUMULATION OF TOTAL BODY WATER |
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Beat Knechtle1,2  ,
Brida Duff1, Ingo Schulze3 and Götz Kohler4 |
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1Gesundheitszentrum St. Gallen, St. Gallen, Switzerland, 2Department of General Practice, University of Zürich, Zürich, Switzerland, 3Deutschlandlauf, Horb-Nordstetten, Germany, 4Division of Biophysical Chemistry, Biozentrum, University of Basel, Basel, Switzerland |
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© Journal of Sports Science and Medicine (2008) 7, 357 - 364 Search Google Scholar for Citing Articles |
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| 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.
Key words: Body fat - body mass - dehydration - skeletal muscle mass. |
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