[Run across Switzerland--effect on body fat and muscle mass].

A long-distance runner has run approximately 320 km (Rorschach-Vevey) with almost 7000 meters of difference in altitude within 54 hours in cold environment. 15 000 kcal were taken in and more than 18000 kcal were consumed which resulted in a body weight loss of 0.400 kg, muscle mass was reduced by 1.020 kg and fat mass by 0.300 kg.