Related Experiment Video
Updated: Oct 19, 2025
08:45
Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption
Published on: June 20, 2025
239
Triaxial Accelerometry-Based Moderate to Vigorous Physical Activity in Older Adults Using Four Different Methods
Anna Hall1, Madisen Hillebrant-Openshaw2, Sierra Baca-Zeff2
1Braveheart Solutions, LLC, Pocatello, ID,USA.
Journal of Aging and Physical Activity
|September 22, 2021
Summary
Physical activity measurement using accelerometry varies by method. Older adults often don't meet guidelines with bouted moderate to vigorous physical activity (MVPA) calculations, unlike sporadic methods.
Area of Science:
- Gerontology
- Exercise Physiology
- Biomedical Engineering
Background:
- Accurate measurement of physical activity is crucial for public health.
- Accelerometry is a common tool, but reporting methods can influence results.
- Older adults have unique considerations for physical activity assessment.
Purpose of the Study:
- To investigate variability in moderate to vigorous physical activity (MVPA) calculation methods.
- To compare bouted versus sporadic MVPA reporting in older adults.
- To identify lifestyle correlates of physical activity in this demographic.
Main Methods:
- Utilized ActiGraph wGT3X-BT monitors for accelerometry data collection (n=111, age 70.3±6.3).
- Analyzed MVPA using 10-min bouted and sporadic methods.
- Applied cut-points calibrated for both older and younger adults.
Main Results:
- Bouted MVPA methods, regardless of cut-point, showed the sample did not meet 150 min/week guidelines.
- Sporadic MVPA calculations resulted in meeting national physical activity recommendations.
- Higher physical activity was associated with having multiple physical hobbies; social behavior showed no association.
Conclusions:
- Accelerometry reporting methods significantly impact physical activity volume and guideline adherence rates.
- Sporadic MVPA calculation may provide a more favorable view of activity levels in older adults.
- Understanding methodological variability is key for interpreting physical activity research and public health recommendations.
