Journal article

METABOLIC CHARACTERISTICS OF SKELETAL-MUSCLE DURING DETRAINING FROM COMPETITIVE SWIMMING

DL COSTILL, WJ FINK, M HARGREAVES, DS KING, R THOMAS, R FIELDING

MEDICINE AND SCIENCE IN SPORTS AND EXERCISE | WILLIAMS & WILKINS | Published : 1985

Abstract

After 5 months of intense training, eight male swimmers were studied during 4 wk of inactivity. Biopsy specimens from the deltoid muscle revealed that its respiratory capacity (QO2) decreased by 50% (5174 to 2559 microliter X h-1 X g-1) after 1 wk of inactivity. Subsequent weeks of detraining did not change the QO2. Although the trained swimmers' muscle phosphofructokinase and phosphorylase activities were significantly higher (P less than 0.05) than those from a group (N = 8) of untrained men, 4 wk of detraining had no effect on these enzyme activities. Mean (+/-SE) resting muscle glycogen concentrations were significantly higher (P less than 0.05) for the trained swimmers (153 +/- 3 mmol X..

View full abstract

University of Melbourne Researchers