Canadian Journal of Applied Physiology· 2005
Attenuation of Protective Effect Against Eccentric Exercise-Induced Muscle Damage
- 69citations
- 2005year
Short summary
The protective effect against muscle damage from eccentric exercise diminishes significantly after 8 weeks, and is further attenuated at 12 weeks, particularly for strength and biochemical markers.
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Key points
- Protective effect against eccentric exercise damage is reduced when the interval between exercise bouts increases.
- Significant attenuation observed at 8 weeks, with further reduction in strength and biochemical markers by 12 weeks.
- Measures of protection differ, with strength, soreness, CK, and Mb showing more pronounced attenuation at 12 weeks than other markers.
- Thirty young men participated, performing two bouts of 12 maximal eccentric actions of elbow flexors.
AI-generated from the title and abstract; the full text is not read.
Abstract
A single bout of eccentric exercise confers a long-lasting protective effect against subsequent bouts of the same exercise. This study investigated how the protective effect was lessened when the interval between the initial and secondary exercise bouts was increased from 4 to 12 weeks. Thirty young men performed two bouts of 12 maximal eccentric actions of the elbow flexors of the nondominant arm separated by either 4 (n = 9), 8 (n = 10), or 12 (n = 11) weeks. Maximal isometric strength, flexed and relaxed elbow joint angles, range of motion, upper arm circumference, muscle soreness, plasma creatine kinase (CK), and myoglobin (Mb) were measured before, immediately after, and for 4 days after exercise. Changes in criterion measures were compared between bouts for each group and among groups by two-way repeated-measures ANOVA. There were no significant differences among groups in the changes in all measures following the first bout. Significantly (p < 0.05) smaller responses in all measures were observed after the second bout as compared with first bout for the 4 and 8 weeks, but only in strength, muscle soreness, CK, and Mb for the 12 weeks. It was concluded that some aspects of the protective effect were attenuated after 8 weeks, and the factors responsible for the effect vary among the measures.
The authors' abstract, as published at the source. Canadian Journal of Applied Physiology, 2005 · DOI ↗
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Field: Rehabilitation
RehabilitationMedicine