Abstract des Autors

A study was conducted to determine the changes in urinary 3-methylhistidine (3-ME), urea-nitrogen (Urea-N) and creatinine (CR) in the initial period of weight training. The urinary excretion of 3-ME, Urea-N and CR over a 24-h period in nine human subjects was determined before and during (at one-day intervals) a weight training period of 11 days. Two periods of weight training at different work intensities were performed; experiment A (Exp. A): three sets of 8 repetitions at 60% of maximal voluntary contraction (MVC); experiment B (Exp. B): one set of 48 repetitions at 30% of MVC. Subjects in both Exp. A and Exp. B performed five kinds of weight lifting exercise (hyper extension, sit-up, bench press, leg curl, leg extension) every day during the weight training period. The main results obtained were as follows: 1) Urine volume and urinary CR showed no clear changes ineither Exp. A or Exp. B. 2) In Exp. A, urinary 3-ME increased significantly, and Urea-N tended to decrease during the weight training period. 3) After the weight training period, girth of the chest, upper arm and thigh tended to be increased after Exp. A in comparison with those before the weight training period. These results suggest that whole-body protein catabolism in the initial period of weight training is dependent on the aim and type of weight training. Verf.-Referat