Muscle Substrate Utilization and Lactate Production During Weightlifting

Abstract

Biopsies (biceps) were examined in 8 bodybuilders across a typical arm-curl training session (80% 1-RM). [PCr] and [glycogen] decreased 62 and 12% after 1 set (n = 4), and 50 and 24% after 3 sets (n = 4). [Lactate] was 91 and 118 mm kg−1, respectively, after 1 and 3 sets. Fatigue was probably partially caused by decreased [PCr] and increased [H+] (first set) and by increased [H+] in subsequent sets. Key words: phosphagen utilization, glycogen depletion, biceps brachii