Document Detail

MRI analysis of structural changes in skeletal muscles and surrounding tissues following long-term walking exercise with training equipment.
MedLine Citation:
PMID:  18599678     Owner:  NLM     Status:  MEDLINE    
Muscular recovery after exercise is an important topic in sports medicine, and accurate and quantitative measurements of changes in muscle are required to assess muscular recovery. In the present study, we report a new analytical method to measure muscular changes quantitatively. The technique consists of three independent methods: image processing of two-dimensional MR images, morphological analysis using three-dimensional MR images, and diffusion tensor MRI. Using this method, we investigated changes in the quadriceps and biceps femoris and gluteus maximus muscles and surrounding tissues before and after 1 mo of exercise wearing training equipment. The subjects were 21 healthy adult female volunteers, 14 of whom wore training equipment and 7 who wore normal equipment. The percentage of adipose tissue in muscle after exercise in subjects who wore training equipment was on average 4.4% (P < 0.001) lower than that before exercise, and the peak point of the dorsal hip after exercise with use of the equipment was on average 10.8 mm higher than that before exercise. Further, the fractional anisotropy of water diffusion in muscles increased by an average of 0.039 (P < 0.001) after exercise with use of training equipment. In contrast, there was no significant difference before and after exercise in subjects who wore normal equipment. These results show that walking exercise while wearing training equipment thickens and tightens the muscular fiber tissues. This noninvasive measurement approach may allow quantitation of the athletic ability of the muscles, which is not measured conventionally, and is an effective method for analyzing skeletal muscles.
Ryusuke Nakai; Takashi Azuma; Mai Sudo; Shin-Ichi Urayama; Osamu Takizawa; Sadami Tsutsumi
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Publication Detail:
Type:  Journal Article     Date:  2008-07-03
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  105     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-09-09     Completed Date:  2008-10-03     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  958-63     Citation Subset:  IM    
Department of Medical Simulation Engineering, Kyoto UNiversity53 Kawahara-cho Syogoin, Sakyo-ku, Kyoto 606-8507, Japan.
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MeSH Terms
Adipose Tissue / anatomy & histology
Body Water / metabolism
Exercise / physiology*
Hip / physiology
Image Processing, Computer-Assisted
Imaging, Three-Dimensional
Magnetic Resonance Imaging*
Muscle, Skeletal / anatomy & histology*,  metabolism
Quadriceps Muscle / anatomy & histology
Recovery of Function
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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