英文摘要
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Introduction: The high tension generated by eccentric exercise is likely to cause significant damage to the muscle fibers, which further causes the protein (e.g. creatine kinase, CK) originally located within the muscles to be released into the blood circulation. CK is one of the common blood biochemical markers used to evaluate the magnitude of eccentric exercise-induced muscle damage (EIMD). Previous studies reported elevation of blood CK after eccentric exercise demonstrated huge individual differences, which was liable to affect the evaluative results of EIMD. However, the relationship between CK and other EIMD indices (e.g. muscular strength) following ECC is remained unknown. Therefore, the purpose of the present study is to test the variability in blood CK after maximal isokinetic eccentric exercise (ECC) and the hypothesis that whether variability in blood CK following ECC is relevant with other EIMD indices. Methods: Two hundred college-aged male performed 5 sets of 6 ECC (30°/s) elbow flexors applying the non-dominant arm. Blood CK, maximal voluntary isometric contraction strength (MVC), range of motion (ROM), upper arm circumference (CIR), and muscle soreness (SOR) were taken instantly or within 5 days, both before and after the ECC tests. Afterwards, peak-CK values post-ECC for all subjects were ranked, then selected top and bottom 20% of the whole samples (n = 40/group) as high (HR) and low responders (LR) groups. Data were analyzed by a two-way ANOVA and multiple regression analysis. Results: 1. Compared to the baseline level, significant (p < .05) changes were found in all dependent variables after ECC in ALL subjects, HR and LR groups. 2. The HR group has greater (p < .05) changes in variables than the LR group after ECC tests. 3. Peak CK values in the ALL subjects group had correlation (p < .05) with maximal changes in MVC (r = -.42), ROM (r = -.73), CIR (r = .65) and SOR (r = .43) after ECC; Peak CK values in the HR group had correlation (p < .05) with maximal changes in SOR (r = .38), ROM (r = -.63) and CIR (r = .68) post-ECC. 4. Maximal changes in ROM (R^2 = .52) and CIR (R^2 = .57) for all subjects group, and maximal changes in CIR (R^2 = .45) and ROM (R^2 = .54) for the HR group had the effect of predicting peak CK values. Conclusions: These results showed changes in CK and all EIMD markers post-ECC were higher in HR than LR. Thus, these findings of the present study can be provided as reference for trainees or sport scientists of variability in EIMD for general public.
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