Document Detail

Comparative effects of high- and low-intensity resistance training on thigh muscle strength, fiber area, and tissue composition in elderly women.
MedLine Citation:
PMID:  8842574     Owner:  NLM     Status:  MEDLINE    
The effects of 52 weeks resistance training at one of two exercise intensities on thigh muscle strength, fiber cross-sectional area (CSA), and tissue composition were studied in healthy 65-79-year-old women. Subjects were assigned to either a control (CO), high-intensity (HI) or low-intensity (LO) training group. Exercise regimens consisted of three sets of leg press, knee extension, and knee flexion exercises, 3 days/week, at either 80% of one-repetition maximum (1-RM) for seven repetitions (HI) or 40% of 1-RM for 14 repetitions (LO). Dynamic muscle strength was evaluated by 1-RM, thigh lean tissue mass (LTM), fat mass, and bone mineral density (BMD, g/cm2) by dual energy X-ray absorptiometry, and fiber CSA of vastus lateralis m. by histomorphometry. Muscle strength increased, on average (+/- SEM), by 59.4 +/- 7.9% and 41.5 +/- 7.9% for HI and LO, respectively, compared to 1.3 +/- 4.8% in CO (P = 0.0001). Type I fiber CSA increased over time (P < 0.05) in both exercise groups, with a trend for increased type II area (HI, P = 0.06; LO, P = 0.11). There was no significant effect of either exercise program on thigh tissue composition, except for BMD at the 1/3 site (middle third of the femur), where LO and CO groups experienced a decline (P < 0.05) of -2.2 +/- 0.5% and -1.8 +/- 0.6%, respectively, while HI maintained BMD (+1.0 +/- 1.0%). Both training programs produced significant gains in thigh muscle strength, which were associated with fiber hypertrophy, although these did not translate into appreciable alterations in thigh tissue composition.
D R Taaffe; L Pruitt; G Pyka; D Guido; R Marcus
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Clinical physiology (Oxford, England)     Volume:  16     ISSN:  0144-5979     ISO Abbreviation:  Clin Physiol     Publication Date:  1996 Jul 
Date Detail:
Created Date:  1996-12-26     Completed Date:  1996-12-26     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8309768     Medline TA:  Clin Physiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  381-92     Citation Subset:  IM; S    
Musculoskeletal Research Laboratory, Veterans Affairs Medical Center, Palo Alto, California, USA.
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MeSH Terms
Absorptiometry, Photon
Aging / physiology*
Analysis of Variance
Body Composition
Bone Density
Bone and Bones / metabolism
Exercise / physiology*
Exercise Tolerance / physiology
Muscle Fibers, Skeletal / cytology,  physiology*
Muscle, Skeletal / cytology,  physiology*

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