Abstract

From Wistar rats, maintained on a meat-free diet the 24-hour urine was collected after single exercises as well as during and after various periods of daily exercises. Six or 10 hours swimming as well as continuous running at moderate speed and repeated dashes, resulted in increased 3-methylhistidine excretion during the recovery period. The 3-methylhistidine excretion response to swimming was more pronounced but less prolonged in trained than in untrained animals. During a 8-week training period an overall decrease of 3-MH excreation was obreserved in spite of an increase during the first days of recovery. Following exercise, performed until exhaustion, a pronounced increase of 3-MH excretion was common in rats specifically adapted to given forms of muscular activity. Repetition of short-term dashes until exhaustion caused a more prolonged period of elevated excretion of 3-MH than did continous exercise of moderate intensity and maximal duration. Verf.-Referat