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Self-reported activity and accelerometry in 2 behavior-maintenance trials.

Meghan M Senso¹, Christopher P Anderson², A Lauren Crain²

¹HealthPartners Institute for Education and Research, Minneapolis, MN, USA meghan.m.senso@healthpartners.com.

American Journal of Health Behavior

|March 18, 2014

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Accelerometry and self-reported physical activity measurements differ significantly in intervention studies. Self-report may be influenced by bias, impacting validity for primary activity outcomes.

Area of Science:

Exercise Physiology
Behavioral Science

Background:

Objective measures like accelerometry (MVPA-A) and self-reported activity (MVPA-SR) are used to assess physical activity.
Comparing these measures is crucial for understanding intervention impacts on physical activity maintenance and weight loss.

Purpose of the Study:

To compare accelerometry (MVPA-A) and self-reported activity (MVPA-SR) in two distinct intervention trials: Keep Active Minnesota (KAM) and Keep It Off (KIO).
To examine how study, treatment, or time influences the association between MVPA-A and MVPA-SR.

Main Methods:

Linear regression was employed to analyze the associations between MVPA-A and MVPA-SR.
Moderation analyses were conducted to assess the influence of study, treatment, and time.

Main Results:

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MVPA-A showed no significant difference between KAM (119 min) and KIO (112 min).
MVPA-SR differed significantly between KAM (350 min) and KIO (87 min).
Study design moderated the correlation between MVPA-A and MVPA-SR, with MVPA-SR predicting MVPA-A better in KIO than KAM.

Conclusions:

Self-presentation bias may affect the validity of self-reported physical activity in intervention studies.
Researchers should consider the limitations of self-report for assessing activity dimensions poorly captured by objective measures.