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Updated: Apr 27, 2026

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption

Published on: June 20, 2025

Accelerometer Derived Activity Counts and Oxygen Consumption between Young and Older Individuals.

Lucas Whitcher¹, Charilaos Papadopoulos²

¹Department of Applied Arts and Sciences, University of Montana-Missoula College, Missoula, MT 95812, USA.

Journal of Aging Research

|July 10, 2014

Summary

Accelerometer activity counts are similar between young and elderly individuals, despite older adults having higher exercise oxygen consumption. This suggests activity counts may not fully reflect energy expenditure differences in aging populations.

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Area of Science:

Exercise Physiology
Gerontology
Biomedical Engineering

Background:

Understanding age-related differences in physical activity and energy expenditure is crucial for health.
Accelerometer-based activity monitors are widely used to estimate physical activity levels.
Metabolic rate and oxygen consumption can vary significantly with age.

Purpose of the Study:

To compare accelerometer activity counts and oxygen consumption between young and elderly adults.
To investigate the relationship between activity counts, oxygen consumption, and age during walking exercise.
To determine if standard resting metabolic rate assumptions are appropriate for different age groups.

Main Methods:

Sixteen young (mean age 21.3 yrs) and sixteen elderly (mean age 66.6 yrs) participants were recruited.
Resting oxygen consumption was measured to determine resting metabolic rate.
Participants completed four 6-minute walking trials at varying intensities (27–94 m·min⁻¹).
Accelerometer data and oxygen consumption were recorded during exercise.

Main Results:

Elderly participants had significantly lower resting oxygen uptake but higher exercise oxygen consumption compared to young participants.
No significant differences in accelerometer activity counts were observed between age groups at any exercise intensity.
Activity counts associated with moderate physical activity (3 METs) differed when using measured versus standard resting metabolic rates, but remained similar across age groups for each RMR method.

Conclusions:

Accelerometer activity counts do not appear to differ significantly between young and elderly individuals during walking.
Despite similar activity counts, elderly individuals exhibit higher oxygen consumption during exercise, indicating a potential underestimation of energy expenditure by activity counts alone in this population.
Age-specific calibration or interpretation of accelerometer data may be necessary to accurately assess physical activity energy expenditure in older adults.