Body mass change and ultraendurance performance: a decrease in body mass is associated with an increased running speed in male 100-km ultramarathoners.

@article{Rst2012BodyMC,
  title={Body mass change and ultraendurance performance: a decrease in body mass is associated with an increased running speed in male 100-km ultramarathoners.},
  author={Christoph Alexander R{\"u}st and Beat Knechtle and Patrizia Knechtle and A. Wirth and Thomas Rosemann},
  journal={Journal of strength and conditioning research},
  year={2012},
  volume={26 6},
  pages={
          1505-16
        }
}
We investigated, in 50 recreational male ultrarunners, the changes in body mass, selected hematological and urine parameters, and fluid intake during a 100-km ultramarathon. The athletes lost (mean and SD) 2.6 (1.8) % in body mass (p < 0.0001). Running speed was significantly and negatively related to the change in body mass (p < 0.05). Serum sodium concentration ([Na⁺]) and the concentration of aldosterone increased with increasing loss in body mass (p < 0.05). Urine-specific gravity increased… CONTINUE READING
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