Abstract
Background
Recently developed absolute and body size normalized handgrip strength (HGS) cut-points could be used individually and collectively to predict mobility problems and falls.
Aims
We examined the associations of (1) each absolute and normalized weakness cut-point, (2) collective weakness categories, and (3) changes in weakness status on future falls in older Americans.
Methods
The analytic sample included 11,675 participants from the 2006–2018 waves of the Health and Retirement Study. Falls were self-reported. Men were classified as weak if their HGS was < 35.5-kg (absolute), < 0.45 kg/kg (body mass normalized), or < 1.05 kg/kg/m2 (body mass index normalized). While, women were considered weak if their HGS was < 20.0-kg, < 0.337 kg/kg, or < 0.79 kg/kg/m2. Collective weakness categorized those below 1, 2, or all 3 cut-points. The collective weakness categories were also used to observe changes in weakness status over time.
Results
Older Americans below each absolute and normalized cut-point had greater odds for future falls: 1.23 (95% confidence interval (CI): 1.15–1.32) for absolute weakness, 1.20 (CI 1.11–1.29) for body mass index normalized weakness, and 1.26 (CI 1.17–1.34) for body mass normalized weakness. Persons below 1, 2, or all 3 weakness cut-points had 1.17 (CI 1.07–1.27), 1.29 (CI 1.18–1.40), and 1.36 (CI 1.24–1.48) greater odds for future falls, respectively. Those in some changing weakness categories had greater odds for future falls: 1.26 (CI 1.08–1.48) for persistent and 1.31 (CI 1.11–1.55) for progressive.
Discussion
Collectively using these weakness cut-points may improve their predictive value.
Conclusion
We recommend HGS be evaluated in mobility and fall risk assessments.
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Data availability
Data from this investigation are publicly-available on the Health and Retirement Study website.
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Funding
Research reported in this publication was supported by the National Institute on Aging of the National Institutes of Health under Award Number R15AG072348 (to RM). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
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McGrath, R., Jurivich, D.A., Christensen, B.K. et al. Examining the role of different weakness categories for mobility and future falls in older Americans. Aging Clin Exp Res 35, 2491–2498 (2023). https://doi.org/10.1007/s40520-023-02516-6
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DOI: https://doi.org/10.1007/s40520-023-02516-6