NDLI: Lower safety factor for old adults during walking at preferred velocity

Content Provider	PubMed Central
Author	Lida, Mademli Arampatzis, Adamantios
Abstract	Older adults are more prone to falls during walking than young adults, although they walk more slowly and demonstrate higher stability state. This paradox of higher stability state but less safe locomotion let us hypothesize that older people may move closer to their dynamic stability limits. In order to investigate this hypothesis, the present study examined the safety factor of dynamic stability in old and young individuals when walking at their preferred velocity. Twelve older and 12 young male participants walked at their (a) walk-to-run transition velocity (WRV, i.e., maximum capacity) and (b) preferred walking velocity (PWV, i.e., actual applied load). Whole body kinematic data and ground reaction forces were captured. Dynamic stability was assessed using the “margin of stability (MoS)” as a criterion for the stability state of the body (extrapolated center of mass concept). The safety factor was calculated as the ratio between MoS at WRV and MoS at PWV. We found that, although older participants walked slower and provided a higher stability state compared to young ones, they showed a significantly reduced safety factor during preferred walking. This confirmed our hypothesis. Old adults do not walk slowly enough in relation to their maximum walking velocity, resulting to a lower safety factor during normal locomotion. Apparently, the age-related muscle degeneration affects WRV more than PWV. The resulting lower safety factor for the older participants may partly explain the increased risk of falls in their daily life, in spite of slower locomotion.
Related Links	http://dx.doi.org/10.1007/s11357-014-9636-1
Starting Page	9636
File Format	PDF
ISSN	15744647
e-ISSN	15744647
Journal	Age
Issue Number	3
Volume Number	36
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-06-01
Access Restriction	Open
Rights Holder	Springer Netherlands
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Aging Geriatrics and Gerontology

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