A1 Journal article (refereed)
Physical activity scaled to preferred walking speed as a predictor of walking difficulty in older adults : a 2-year follow-up (2021)


Karavirta, L., Leppä, H., Rantalainen, T., Eronen, J., Portegijs, E., & Rantanen, T. (2021). Physical activity scaled to preferred walking speed as a predictor of walking difficulty in older adults : a 2-year follow-up. Journals of Gerontology Series A : Biological Sciences and Medical Sciences, Advance Article. https://doi.org/10.1093/gerona/glab277


JYU authors or editors


Publication details

All authors or editors: Karavirta, Laura; Leppä, Heidi; Rantalainen, Timo; Eronen, Johanna; 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: 2021

Volume: Advance Article

Publisher: Oxford University Press (OUP)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1093/gerona/glab277

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/78016


Abstract

Background
The usual accelerometry-based measures of physical activity (PA) are dependent on physical performance. We investigated the associations between PA relative to walking performance and the prevalence and incidence of early and advanced walking difficulties compared to generally used measures of PA.

Methods
Perceived walking difficulty was evaluated in 994 community-dwelling participants at baseline (age 75, 80 or 85 years) and two years later over two kilometers (early difficulty) and 500 meters (advanced difficulty). We used a thigh-mounted accelerometer to assess moderate-to-vigorous PA, daily mean acceleration and relative PA as movement beyond the intensity of preferred walking speed in a 6-minute walking test (PArel). Self-reported PA was assessed using questionnaires.

Results
The prevalence and incidence were 36.2 % and 18.9 % for early, and 22.4 % and 14.9 % for advanced walking difficulty, respectively. PArel was lower in participants with prevalent (mean 42 (SD 45) vs. 69 (91) mins/week, p<0.001) but not incident early walking difficulty (53 (75) vs. 72 (96) mins/week, p=0.15) compared to those without difficulty. The associations between absolute measures of PA and incident walking difficulty were attenuated when adjusted for preferred walking speed.

Conclusions
The variation in habitual PA may not explain the differences in the development of new walking difficulty. Differences in physical performance explain a meaningful part of the association of PA with incident walking difficulty. Scaling of accelerometry to preferred walking speed demonstrated independence on physical performance and warrants future study as a promising indicator of PA in observational studies among older adults.


Keywords: senior citizens; physical disabilities; forecasts; physical activeness; walking (motion); pedometers

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


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Ministry reporting: No, publication in press

Preliminary JUFO rating: 3


Last updated on 2021-04-10 at 15:05