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Acute responses of bone specific and related markers to maximal eccentric exercise of the knee extensors and flexors in young men

OBJECTIVES: The present study determined time-course changes in plasma bone-specific and -related markers following a bout of maximal eccentric contractions (MaxEC) of bilateral knee extensors (KE) and flexors (KF). METHODS: Sedentary young men (n=30) performed a bout of 10 sets of 10 MaxEC (30°/s)...

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Detalles Bibliográficos
Autores principales: Huang, Tsang-Hai, Lin, Jung-Charng, Ma, Mi-Chia, Yu, Tsung, Chen, Trevor C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Society of Musculoskeletal and Neuronal Interactions 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7288386/
https://www.ncbi.nlm.nih.gov/pubmed/32481236
Descripción
Sumario:OBJECTIVES: The present study determined time-course changes in plasma bone-specific and -related markers following a bout of maximal eccentric contractions (MaxEC) of bilateral knee extensors (KE) and flexors (KF). METHODS: Sedentary young men (n=30) performed a bout of 10 sets of 10 MaxEC (30°/s) of KE and KF with each leg, respectively. Maximal voluntary isometric contraction (MVC) torque, muscle soreness (SOR), plasma creatine kinase (CK) activity, insulin, leptin, tumor necrosis factor-α (TNF-α), undercarboxylated-osteocalcin (ucOCN), carboxy-terminal crosslinking telopeptide of type I collagen (CTX-1) and procollagen type I N-terminal propeptide (P1NP) concentrations were measured from before to 7 days after MaxEC. RESULTS: Significant changes in MVC (KE:-28%,KF:-38%), SOR and plasma CK activity (peak: 39,163 IU/L) following MaxEC were evident (P<0.05) compared to baseline. Plasma leptin (17%) concentrations decreased at 1 day after MaxEC. In bone related markers, plasma ucOCN concentrations (20%) increased at 7 days after MaxEC, and plasma CTX-1 concentrations decreased at 2, 4 and 7 days after MaxEC (6~7%; P<0.05). CONCLUSION: These results demonstrate that a lean effect of bone generation and an enhanced energy anabolism can be induced by a single bout of MaxEC.