Difference in the magnitude of muscle damage between maximal and submaximal eccentric loading.
This study compared maximal (MAX-ECC) and submaximal (50%-ECC) eccentric exercise of the elbow flexors. Untrained male students (n = 8) performed 3 sets of 10 repetitions of MAX-ECC with one arm and 50%-ECC with the other arm, separated by 4 weeks. In MAX-ECC, the elbow joint was forcibly extended from a flexed (90 degrees ) to a full-extended position (180 degrees ) in 3 seconds while producing maximal force. For 50%-ECC, a dumbbell set at 50% of the maximal isometric strength at 90 degrees of the elbow joint was lowered from the flexed to the extended position in 3 seconds. Changes in indicators of muscle damage were compared between the bouts by a 2-way repeated-measures analysis of variance. Changes in isometric strength, range of motion, upper arm circumference, and plasma creatine kinase activity were significantly smaller and the recovery was significantly faster for 50%-ECC compared with MAX-ECC, although the differences in the changes immediately after exercise were small. It appeared that the magnitude of initial muscle damage was similar between the bouts; however, secondary damage was less after 50%-ECC.
Nosaka
Kazunori
K
Exercise and Sports Science, Graduate School of Integrated Science, Yokohama City University, Yokohama, Japan. nosaka@yokohama-cu.ac.jp
Newton
Mike
M
D000293:Adolescent; D000328:Adult; D000886:Anthropometry; D003402:Creatine Kinase / Q000097:blood; D004550:Elbow / Q000503:physiopathology; D015444:Exercise / Q000502:physiology*; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D008297:Male; D018482:Muscle, Skeletal / Q000000981:diagnostic imaging / Q000503:physiopathology*; D010146:Pain / Q000503:physiopathology; D014463:Ultrasonography; D014891:Weight Lifting / Q000502:physiology*; D016474:Weight-Bearing / Q000502:physiology
D003402:Creatine Kinase