Journal
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
Volume 34, Issue 6, Pages 920-927Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00005768-200206000-00003
Keywords
maximal isometric force; upper-arm circumference; plasma CK activity; fatigue; eccentric exercise
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NOSAKA, K., M. NEWTON, and P. SACCO. Muscle damage and soreness after endurance exercise of the elbow flexors. Med. Sci. Sports Exerc., Vol. 34. No. 6, pp. 920-927 2002. Purpose: This study investigated changes in indirect markets of III muscle damage after endurance exercise of the elbow flexors and compared the changes with those after maximal eccentric actions (Max-ECC) of thee I bow flexors. Methods: Eighteen male students rhythmically lifted (1 s) and lowered (1 s) a light dumbbell (1.1-1.8 k,-: 9% of MIF) in 60-180degrees of elbow joint angle for 2 h (2-h Ex). Maximal isometric force (MIF). relaxed (RANG) and flexed elbow joint angles (FANG), upper-arm circumference (CIR), muscle soreness (SOR). B-mode ultrasound (US), and plasma creatine kinase (CK) activity were assessed before and immediately after, and up to 96 h after exercise. Results: All measures were altered significantly (P < 0.05) after 2-h Ex in a similar time course to Max-ECC; however, changes in RANG, FANG, CIR, US. and CK (peak: 356 +/- 121 (IUL-1)-L-.) were significantly (P < 0.05) smaller compared with those after Max-ECC. SOR developed immediately after 2-h Ex and peaked 24-48 h after exercise. MIF dropped to 44.1% of the preexercise level, which was significantly (P < 0.05) lower than that after Max-ECC (58.1%), immediately postexercise. MIF recovered to 79.8% at 24 h, and 97.8% at 96 h postexercise, which was a significantly (P < 0.05) faster recovery compared with that of Max-ECC (73.1% at 96 h). Conclusion: These results showed low-intensity continuous muscle contractions (3600 times) resulted in muscle damage: however, the magnitude of the muscle damage was less severe, and the recover), was faster compared with 12 maximal eccentric muscle actions.
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