AIM: This study aimed to investigate the effects of eccentric contractions (ECs) of the biceps brachii muscle on bone metabolism markers.
METHODS: Eight untrained subjects (20.0±0.5 years) performed 5 sets of 6 maximal ECs of the elbow flexors with a 2-min rest interval between each set. Blood samples were collected at 6 time points: before (Pre) ECs, immediately after (Post) ECs, and two hours (2 hours), 1 (day 1), 3 (days 3), and 5 days (days 5) after ECs. We measured the levels of the bone formation marker osteocalcin (OC) and the resorption marker tartrate-resistant acid phosphatase 5b (TRACP-5b). In addition, we measured the isometric tetanic torque and the levels of myoglobin (Mb), creatine kinase (CK), blood lactate, and insulin-like growth factor-1 (IGF-1).
RESULTS: The results showed 1) CK and Mb levels increased significantly by days 3 and 5 (P
CONCLUSION: We conclude that a single bout of ECs of the biceps has a negative effect on bone metabolism in the acute phase.
|Number of pages||7|
|Journal||The Journal of sports medicine and physical fitness|
|Publication status||Published - Oct 1 2014|
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