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Med Sci Sports Exerc. 2010 May;42(5):1004-12. doi: 10.1249/MSS.0b013e3181c0a818.

Potent protective effect conferred by four bouts of low-intensity eccentric exercise.

Author information

1
Department of Physical Education, National Chiayi University, Chiayi County, Taiwan. trevorchen@mail.ncyu.edu.tw

Abstract

PURPOSE:

It is known that submaximal eccentric exercise does not confer as strong a protective effect as maximal eccentric exercise. This study tested the hypothesis that four bouts of submaximal eccentric exercise would confer a similar protective effect to one bout maximal eccentric exercise.

METHODS:

Thirty untrained men were placed into 4 x 40% (40%) or control (CON) groups (n = 15 per group) by matching preexercise maximal voluntary isometric contraction strength (MVC). The 40% group performed 30 eccentric contractions with a load of 40% MVC (40% ECC) every 2 wk for four times followed 2 wk later by 30 maximal eccentric exercise (100% ECC) of the elbow flexors of the nondominant arm. The CON group performed two bouts of the 100% ECC separated by 2 wk. MVC at six angles, optimum angle (OA), concentric isokinetic strength (30 degrees x s(-1) and 300 degrees x s(-1)), range of motion, upper arm circumference, plasma creatine kinase activity and myoglobin concentration, muscle soreness, and echo intensity of B-mode ultrasound images were taken before to 5 d after each exercise.

RESULTS:

No significant differences in the changes in any measures were evident between the 100% ECC of the 40% group and the second 100% ECC of the CON group. Changes in all measures except for OA and upper arm circumference after the second to the fourth 40% ECC bouts were significantly smaller than those after the first 40% ECC bout. The changes in the measures after any of the 40% ECC bouts were significantly (P < 0.05) smaller than those after the first 100% ECC bout of the CON group.

CONCLUSIONS:

These results suggest that repeating submaximal eccentric exercise confers the same magnitude of protective effect as one bout of maximal eccentric exercise against the subsequent maximal eccentric exercise.

PMID:
19997007
DOI:
10.1249/MSS.0b013e3181c0a818
[Indexed for MEDLINE]

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