Document Detail

Effects of strenuous exercise with eccentric muscle contraction: physiological and functional aspects of human skeletal muscle.
MedLine Citation:
PMID:  21187687     Owner:  NLM     Status:  In-Process    
PURPOSE: we used magnetic resonance (MR) imaging and ultrasonography in combination with a dynamometer to assess physiological and functional aspects of the skeletal muscles after strenuous exercise that included eccentric contraction.
METHODS: seven male subjects (mean age, 21.7 years) performed ankle plantar flexion that included eccentric contraction and underwent diffusion-weighted MR imaging for calculation of the apparent diffusion coefficient (ADC) of the triceps surae muscles. We used ultrasonography combined with a dynamometer to measure the displacement of the myotendinous junction (MTJ) of the medial gastrocnemius and maximal isometric force during ankle plantar flexion. We also assessed the level of muscle soreness of the calf using a visual analogue scale. We measured these parameters before exercise and one, 2, 3, 5, and 8 days after exercise and examined significant changes from the pre-exercise value using repeated-measures analysis of variance with Dunnett's test for each measurement parameter.
RESULTS: one day after exercise, we observed increased muscle soreness (P<0.001) and decreased MTJ displacement (P<0.05); isometric force generation tended to decrease, but the change was not significant. Muscle soreness peaked 2 days after exercise (P<0.001) and remained significantly increased until 5 days after exercise (P<0.005). The medial gastrocnemius exhibited increased ADC value 3 days after exercise (P<0.005), but the lateral gastrocnemius and the soleus showed no significant changes throughout this study.
CONCLUSION: our findings suggest that muscle damage induced by eccentric contraction manifests as muscle soreness and dysfunction early after exercise and later increases water diffusion within damaged muscle.
Osamu Yanagisawa; Toshiyuki Kurihara; Koji Okumura; Toru Fukubayashi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Magnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine     Volume:  9     ISSN:  1880-2206     ISO Abbreviation:  Magn Reson Med Sci     Publication Date:  2010  
Date Detail:
Created Date:  2010-12-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101153368     Medline TA:  Magn Reson Med Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  179-86     Citation Subset:  IM    
Faculty of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan.
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