Document Detail


Energetics of walking in elderly people: factors related to gait speed.
MedLine Citation:
PMID:  20679072     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Slow walking speed in elderly people predicts increased morbidity and mortality. We examined factors that may be associated with decreased habitual walking speed in older men and women.
METHODS: Older (range: 60-88 years, mean = 72.5 years) men (n = 25) and women (n = 24) were recruited. The Short Physical Performance Battery, body composition, VO(₂peak) on a treadmill, VO₂ and rated perceived exertion during 10 minutes of walking at habitual gait speed and at a walking speed of 0.9 m/s, muscle strength, and level of physical activity were measured.
RESULTS: VO(₂peak) was strongly related to habitual gait speed (r = .744, p < .001) and remained significant even after controlling for age, muscle strength, and gender. Compared with the tertile of fastest walkers (mean gait speed, 1.37 ± 0.04 m/s), the tertile of slowest walkers (0.87 ± 0.02 m/s) were older (p < .001), shorter (p = .026), had lower lean body mass (p = .011), lower strength ( p < .001), less self-reported daily physical activity (p = .102), and higher relative (to VO(₂peak)) intensity during walking at their habitual speed (65.3% ± 3.9% vs 54.3% ± 2.1% of VO(₂peak), p = .013).
CONCLUSIONS: VO(p₂eak) was strongly associated with habitual walking speed, suggesting that as aerobic capacity declines with age, the exertion associated with habitual gait speed increases. A slowing of walking speed may be a response to increased perception of exertion. The extent to which exercise training affects habitual gait speed and fatigue is not clear.
Authors:
Wesley M Fiser; Nicholas P Hays; Sarah Clary Rogers; Oumitana Kajkenova; Ann Elizabeth Williams; Christopher M Evans; William J Evans
Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2010-08-01
Journal Detail:
Title:  The journals of gerontology. Series A, Biological sciences and medical sciences     Volume:  65     ISSN:  1758-535X     ISO Abbreviation:  J. Gerontol. A Biol. Sci. Med. Sci.     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-11-24     Completed Date:  2011-01-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9502837     Medline TA:  J Gerontol A Biol Sci Med Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1332-7     Citation Subset:  AIM; IM    
Affiliation:
Muscle Metabolism DPU, Research and Development, GlaxoSmithKline, Research Triangle Park, NC 27709, USA.
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MeSH Terms
Descriptor/Qualifier:
Age Factors*
Aged
Aged, 80 and over
Body Composition
Body Height
Body Weight
Energy Metabolism*
Female
Gait / physiology*
Habits
Humans
Leg / physiology
Male
Middle Aged
Motor Activity
Muscle Strength
Oxygen Consumption
Physical Exertion
Physical Fitness / physiology
Speech / physiology
Time Factors
Walking / physiology*

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


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