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 × 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.
Publication types
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Clinical Trial
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Randomized Controlled Trial
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Research Support, Non-U.S. Gov't
MeSH terms
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Adenosine Triphosphate / analysis
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Adenosine Triphosphate / metabolism
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Adult
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Analysis of Variance
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Arm / physiology
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Biopsy, Needle
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Glycogen / analysis
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Glycogen / metabolism*
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Humans
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Hydrogen / metabolism
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Lactic Acid / biosynthesis*
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Lactic Acid / blood
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Male
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Muscle Contraction / physiology
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Muscle Fatigue / physiology
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Muscle, Skeletal / chemistry
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Muscle, Skeletal / metabolism*
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Phosphocreatine / analysis
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Phosphocreatine / metabolism*
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Weight Lifting / physiology*
Substances
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Phosphocreatine
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Lactic Acid
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Hydrogen
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Adenosine Triphosphate
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Glycogen