Document Detail

Differences in the neuromuscular capacity and lean muscle tissue in old and older community-dwelling adults.
MedLine Citation:
PMID:  11382799     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: This study investigated whether there was a worsening of the neuromuscular capacity of older adults after the seventh decade of life. METHODS: Fifteen healthy community-dwelling old (< 70 years of age) and 15 older adults (> or = 70 years of age) were assessed for maximal isometric strength (MVC) and force production characteristics, a one-repetition maximum (1-RM) performance, electromyographic (EMG) activity, and bone-free lean tissue (BFLT) mass of the lower extremity. RESULTS: The isometric MVC, 1-RM, and BFLT mass values in the old group were significantly greater than in the older group. In addition, the individual BFLT mass values correlated significantly with the isometric MVC values (r = .85) and the 1-RM scores of the thigh muscle groups (r = .54-.80). The old group generated significantly greater isometric maximal rate of torque development than the older group and performed significantly better at all intervals of the absolute and relative force-time curves. The voluntary muscle activation of the knee extensors of the old group produced significantly higher integrated EMG (iEMG) activity at each epoch in the early iEMG-time curve compared with the old group. CONCLUSIONS: The results suggest that the age-related deterioration in maximal strength measures and rapid force production characteristics in older adults could be related to a reduction in the mass and neural activation of the thigh muscles. The deterioration of the neuromuscular system of community-dwelling older adults may contribute to an increased difficulty in performing daily activities and may increase their risks of tripping and falling.
E L Lamoureux; W A Sparrow; A Murphy; R U Newton
Related Documents :
8532449 - Variations in several mechanical parameters associated with elbow flexion during practi...
24405749 - Body-worn sensors capture variability, but not decline, of gait and balance measures in...
18953529 - Precision in isometric precision grip force is reduced in middle-aged adults.
23500479 - Graphene nanosheets-supported ag nanoparticles for ultrasensitive detection of tnt by s...
10726429 - The effects of rest interval on quadriceps torque and perceived exertion in healthy males.
8919439 - The effect of age, speed, and arm dominance on shoulder function in untrained men.
19168339 - Neutrophilic asthma has different radiographic features to copd and smokers.
507479 - Serum ige levels in healthy black american children: a case for environmental influence...
833079 - Fluid and electrolyte shifts in women during +gz acceleration after 15 days' bed rest.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The journals of gerontology. Series A, Biological sciences and medical sciences     Volume:  56     ISSN:  1079-5006     ISO Abbreviation:  J. Gerontol. A Biol. Sci. Med. Sci.     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-05-30     Completed Date:  2001-06-28     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9502837     Medline TA:  J Gerontol A Biol Sci Med Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  M381-5     Citation Subset:  AIM; IM    
School of Health Sciences, Deakin University, Melbourne, Australia.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Aging / physiology*
Isometric Contraction
Middle Aged
Muscle, Skeletal / anatomy & histology*,  physiology*
Neuromuscular Junction / physiology*
Time Factors

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

Previous Document:  The recommended dietary allowance for protein may not be adequate for older people to maintain skele...
Next Document:  Effect of age on ocular microtremor activity.