A1 Journal article (refereed)
Individual scaling of accelerometry to preferred walking speed in the assessment of physical activity in older adults (2020)


Karavirta, Laura; Rantalainen, Timo; Skantz, Heidi; Lisko, Inna; Portegijs, Erja; Rantanen, Taina (2020). Individual scaling of accelerometry to preferred walking speed in the assessment of physical activity in older adults. Journals of Gerontology Series A : Biological Sciences and Medical Sciences, 75 (9), e111-e118. DOI: 10.1093/gerona/glaa142


JYU authors or editors


Publication details

All authors or editors: Karavirta, Laura; Rantalainen, Timo; Skantz, Heidi; Lisko, Inna; Portegijs, Erja; Rantanen, Taina

Journal or series: Journals of Gerontology Series A : Biological Sciences and Medical Sciences

ISSN: 1079-5006

eISSN: 1758-535X

Publication year: 2020

Volume: 75

Issue number: 9

Pages range: e111-e118

Publisher: Oxford University Press; Gerontological Society of America

Publication country: United States

Publication language: English

DOI: http://doi.org/10.1093/gerona/glaa142

Open Access: Publication channel is not openly available

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/69881


Abstract

Background
Walking forms a large portion of physical activity (PA) of older adults. We assessed free-living PA using acceleration corresponding to preferred walking speed as a relative cut-point, and studied how it relates to age. We compared the relative cut-point to a common absolute cut-point of moderate-to-vigorous PA (MVPA).

Methods
444 community-dwelling adults aged 75, 80 and 85 wore an accelerometer on the thigh during a PA surveillance period and a modified six-minute walking test (6MWT) at preferred speed. Each individual’s mean acceleration (g) during the 6MWT was used as a cut-point for relative PA. Acceleration corresponding to three metabolic equivalents (METs) was used as the cut-point for absolute MVPA.

Results
When using the acceleration of preferred walking speed as a cut-point, 62 (SD 82) minutes a week of relative PA was detected, compared to 228 (163) minutes of absolute MVPA. For 96 % of the participants, the acceleration generated by their preferred walking speed exceeded the common absolute cut-point for MVPA. Absolute MVPA was lower in the older age groups, and 6MWT speed explained 22 % of its variation (p<0.001), whereas relative PA was independent of walking speed and age.

Conclusions
Preferred walking speed was a significant contributor to absolute MVPA, and those who walked the slowest accumulated the least MVPA. Assessing relative PA using the intensity of preferred walking speed as a cut-point eliminated the dependency of PA on age and walking speed, and may be a feasible scaling option to evaluate relative PA among older people.


Keywords: physical activeness; walking (motion); senior citizens; performance (physical capacity); measurement

Free keywords: exercise intensity; physical performance; accelerometer; cut-point


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Last updated on 2020-28-10 at 08:51