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A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers

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Published on: April 21, 2017

Time- vs Step-Based Physical Activity Metrics for Health.

Rikuta Hamaya^1,2, Eric J Shiroma³, Christopher C Moore⁴

¹Division of Preventive Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts.

JAMA Internal Medicine

|May 20, 2024

Summary

Physical activity guidelines may benefit from including step counts alongside moderate to vigorous physical activity (MVPA) time. Both MVPA and daily steps are associated with reduced mortality and cardiovascular disease risk in older women.

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Area of Science:

Gerontology
Epidemiology
Cardiovascular Health

Background:

Current US physical activity guidelines recommend 150 minutes of moderate to vigorous physical activity (MVPA) weekly.
A step-based recommendation is lacking due to insufficient evidence.
Older adults represent a key demographic for physical activity interventions.

Purpose of the Study:

To investigate the association between MVPA time and daily step counts with all-cause mortality and cardiovascular disease (CVD).
To compare the effectiveness of MVPA time versus step counts in predicting health outcomes.

Main Methods:

A cohort study analyzed data from 14,399 women aged 62 years and older from the Women's Health Study.
Physical activity was measured using accelerometers over 7 consecutive days.
Cox proportional hazards regression and survival analysis were used to assess associations with mortality and CVD over a median follow-up of 9 years.

Main Results:

Higher MVPA time and step counts were associated with reduced all-cause mortality and CVD.
Each 1 SD increase in MVPA time and step counts corresponded to a significant reduction in mortality risk (HR 0.82 and 0.74, respectively).
Both metrics showed similar predictive ability for all-cause mortality (AUC 0.55 for both).

Conclusions:

MVPA time and step counts demonstrate similar associations with all-cause mortality and CVD in older women.
Step count goals should be considered for future physical activity guidelines.
Incorporating step-based goals can offer flexibility and accommodate personal preferences in activity tracking.