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Individual physical activity profiling in older adults: Reforming the assessment of dose-response relationship (PA-REFORM)

Reassessment of the exercise dose-response relationship in the era of wearables

Our understanding of older peoples’ physical activity in relation to recommendations is based on flawed models that don’t account for an individual’s ability to move. Methods based on movement speed or volume may underestimate the actual load experienced by an older person. In this project we are using wearable technology and machine learning methodology to examine physical activity and internal load of exercise in older people.

Initial data collection in 2017-2018 was done in the AGNES study with 75-, 80- and 85-year-old people, and involved physical activity surveillance for one week using two wearable sensors: an accelerometer and a heart rate monitor. We are repeating the activity assessments in 2021-2022 and following participant health until 2025.

We will develop a new method for quantifying physical activity in older people, which takes into account individual differences in physical capacity, and will make it possible to develop individualised physical activity recommendations.


Research group

Project leader

Laura Karavirta, Academy Research Fellow, PhD,,

Research group

Timo Aittokoski, Postdoctoral researcher, PhD

Joona Neuvonen, Doctoral researcher, MSc

Associate Investigators

Taina Rantanen, Professor, Gerontology and Public Health, University of Jyväskylä, Finland

Timo Rantalainen, Academy Research Fellow, University of Jyväskylä, Finland

Neil Cronin, Professor, University of Jyväskylä, Finland

Søren Brage, Associate Professor, Leader of the Physical Activity Epidemiology group,

University of Cambridge



Academy of Finland 2021–2026, 339391, 346462

Yrjö Jahnsson Foundation 2020, 17.12.2019

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