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Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption
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Light-intensity physical activity derived from count or activity types is differently associated with adiposity
Charlotte Lund Rasmussen1,2, Melker Staffan Johansson3, Patrick Crowley1
1National Research Center for the Working Environment, Copenhagen, Denmark.
Scandinavian Journal of Medicine & Science in Sports
|June 10, 2020
Summary
Different ways of defining light-intensity physical activity (LIPA) impact associations with body fat. Researchers recommend caution when comparing LIPA study results due to varying definitions.
Area of Science:
- Exercise Physiology
- Public Health
- Biostatistics
Background:
- Accurate measurement of physical activity is crucial for understanding its relationship with health outcomes.
- Light-intensity physical activity (LIPA) is often defined using different criteria, potentially leading to varied research findings.
- Adiposity markers like BMI are key indicators of metabolic health and are influenced by physical activity levels.
Purpose of the Study:
- To compare how different definitions of light-intensity physical activity (LIPA) correlate with adiposity markers.
- To investigate the impact of count-based versus activity type-based LIPA definitions on body composition.
- To analyze the association between LIPA and adiposity using compositional data analysis.
Main Methods:
- Utilized accelerometer data from 516 Danish workers over 1-4 days.
- Derived three distinct LIPA definitions based on accelerometer counts per minute (CPM) and activity types (moving, slow walking, standing).
- Employed compositional regression models to analyze the association between LIPA definitions and adiposity markers (BMI, body fat percentage, waist circumference).
Main Results:
- Daily LIPA time varied significantly across definitions (LIPA 1: 326 min/day, LIPA 2: 102 min/day, LIPA 3: 274 min/day).
- The association between LIPA and adiposity markers differed in direction and strength depending on the LIPA definition used.
- Reallocating 30 minutes from moderate-to-vigorous physical activity (MVPA) to LIPA showed varying effects on BMI, with LIPA 1 showing an increase and LIPA 2/3 showing a decrease.
Conclusions:
- The choice of LIPA definition significantly influences the observed associations with adiposity markers.
- Findings underscore the importance of clearly defining LIPA in research to ensure comparability and accurate interpretation of results.
- Researchers should exercise caution when comparing studies that employ different methodologies for defining and measuring LIPA.
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