Correlation of measured and self-reported physical activity and association of anthropometric factors with measured and self-reported moderate-to-vigorous physical activity among older Finnish men.
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Background: Monitoring of physical activity (PA) is based on physical activity questionnaires and device-based measurements, but their comparability is challenging especially among older adults. The present study investigated the correlation of a simple physical activity questionnaire compared to accelerometer-data and individual-related anthropometric factors which affect measured and self-reported physical activity and overreporting of moderate-to-vigorous activity.
Methods: This study is based on the data of the Promic-study. Older men (n = 298, average age 67) with clinically suspected prostate cancer completed a physical activity survey and wore a triaxial accelerometer for seven consecutive days. Correlation between measured and self-reported physical activity was determined using Spearman’s rank correlation. Associations of individual-related factors were determined separately for measured and self-reported physical activity.
Results: The physical activity questionnaire had a weak but significant correlation against the accelerometry data for light physical activity (ρ = 0.26-0.30, p < 0.001) and moderate-to-vigorous physical activity (MVPA) (ρ = 0.21-0.26, p < 0.001-0.001). Accelerometer-based step count and MVPA had a strong positive and significant correlation (ρ = 0.76, p < 0.001). Age (OR = 0.84, p < 0.001) and active smoking (OR = 0.12, p = 0.004) had a significant negative association with accelerometer-based MVPA. We didn’t find significant association with accelerometer-based MVPA for BMI, total morbidity, educational level or alcohol consumption. Active smoking and high alcohol consumption were associated with increased overreporting of MVPA.
Conclusions: Among older men, simple physical activity questionnaire performed poorly for identifying physical activity. Active smoking and high alcohol consumption were associated with overreporting of MVPA. Objectively measured step count could be a valid tool for assessing MVPA of older men.