| Energetics of walking in elderly people: factors related to gait speed. | |
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MedLine Citation:
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PMID: 20679072 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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Wesley M Fiser; Nicholas P Hays; Sarah Clary Rogers; Oumitana Kajkenova; Ann Elizabeth Williams; Christopher M Evans; William J Evans |
Publication Detail:
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Type: Comparative Study; Journal Article Date: 2010-08-01 |
Journal Detail:
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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:
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Created Date: 2010-11-24 Completed Date: 2011-01-04 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9502837 Medline TA: J Gerontol A Biol Sci Med Sci Country: United States |
Other Details:
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Languages: eng Pagination: 1332-7 Citation Subset: AIM; IM |
Affiliation:
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Muscle Metabolism DPU, Research and Development, GlaxoSmithKline, Research Triangle Park, NC 27709, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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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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