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Can J Appl Physiol. 1999 Jun;24(3):209-15.

Muscle substrate utilization and lactate production.

Author information

1
Department of Kinesiology, McMaster University, Hamilton, ON L8S 4K1 Canada.

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 mmol &times kg-1, respectively, after 1 and 3 sets. Fatigue was probably partially caused by decreased [PCr] and increased [H+] (first set) and by decreased [H+] in subsequent sets.

PMID:
10364416
[Indexed for MEDLINE]

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