title: Effect of swimming on protein degradation: 3-methylhistidine and creatinine excretion.
abstract: The effect of 5-km noncompetitive swimming (moderate exercise) and 2-km competitive speed swimming (intensive exercise) on protein breakdown was studied in a group of young male volunteers (16-20 years old) who followed a 3-MH-free diet throughout the study. Urinary 3-MH and creatinine were determined over a period of 24 and 48 hr as an index of protein degradation. Basal 3-MH levels in the two groups of swimmers were 2.85 and 3.07 mumole X kg-1 X day-1. Mean rates of 3-MH excretion were, respectively, 1.54 and 1.94 mumole X kg-1 X day-1 for the 48 hr after moderate exercise and the 24 hr after intensive exercise. The decrease in 3-MH urinary excretion was still evident when calculated as the urinary 3-MH-to-creatinine ratio.
mesh_terms: D000293:Adolescent; D000328:Adult; D003404:Creatinine / Q000652:urine*; D006639:Histidine / Q000031:analogs & derivatives*; D006801:Humans; D008297:Male; D008762:Methylhistidines / Q000652:urine*; D005082:Physical Exertion; D011506:Proteins / Q000378:metabolism*; D013550:Swimming; D013997:Time Factors
chemical_list: D008762:Methylhistidines; D011506:Proteins; D006639:Histidine; D003404:Creatinine; C028118:3-methylhistidine