Knechtle Beat, Baumann Barbara, Wirth Andrea, Knechtle Patrizia, Rosemann Thomas
Facharzt FMH fur Allgemeinmedizin, Gesundheitszentrum St. Gallen, Vadianstrasse 26, 9001 St. Gallen, Switzerland.
Asia Pac J Clin Nutr. 2010;19(1):91-7.
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.
在瑞士铁人三项赛的一项实地研究中，我们对27名男性白种人非职业铁人三项运动员进行了调查，以探究参加铁人三项赛的男性铁人三项运动员是以脂肪量还是骨骼肌量的形式减轻体重。测定了赛前和赛后的体重、脂肪量和骨骼肌量。此外，还测量了全身水、血液学和尿液参数，以量化水合状态。体重下降了1.8千克（p<0.05），骨骼肌下降了1.0千克（p<0.05），而脂肪量没有变化。尿比重、血浆尿素和血浆量增加（p<0.05）。赛前至赛后体重的变化（Delta）与骨骼肌量无关。此外，血浆尿素变化量（Delta）与骨骼肌量变化量之间没有关联；血浆量变化量与全身水变化量无关（p<0.05）。我们得出结论，参加铁人三项赛的男性铁人三项运动员体重减轻1.8千克，骨骼肌量减轻1千克，可能是由于肌细胞内储存的糖原和脂质耗尽所致。
