Our office will remain closed through Friday, September 18th as we continue to assess the damages caused by Hurricane Sally. ActiGraph team members are working remotely, however shipping delays should be expected at this time. We expect to resume regular business hours on Monday, September 21st. If you need immediate assistance, please contact us by email at email@example.com and we will respond as quickly as possible. Thank you for your continued support.
Validating two self-report physical activity measures in middle-aged adults completing a group exercise or home-based physical activity program
- Published on Nov. 19, 2013
Objectives: To compare self-reported physical activity recorded in physical activity diaries or the Active Australia Survey with objectively measured physical activity using accelerometry in sedentary middle-aged adults completing two physical activity interventions.
Design: Cross-sectional study
Methods: Sedentary 50-65 year olds were recruited to a non-randomized 6-month community group exercise program (G) or a physiotherapist-led home-based physical activity program (HB). Over 7-days, 76 participants (HB 39, G 37) wore an ActiGraph GT1M accelerometer (5s epochs), completed the Active Australia Survey (AAS) and a daily physical activity diary. Data were analysed using descriptive statistics and Spearman rank-order correlations.
Results: The two interventions had similar demographic and physical activity characteristics except that home-based participants were younger (p<0.01), more likely to be employed full time (p≤0.001) and reported less moderate-to-vigorous physical activity in the physical activity diaries compared to group exercise participants (HB 29±21mind-1 vs. G 57±35mind-1, p≤0.001). Home-based participants had fair-to-good agreement between the physical activity diaries and AAS or ActiGraph data (r=0.39-0.68, p<0.05). Group exercise physical activity diary data did not correlate significantly with either the AAS or ActiGraph data. In contrast, group exercise AAS data had good correlations with ActiGraph data (r=0.49-0.64, p≤0.001).
Conclusions: Physical activity diaries should be interpreted cautiously unless intervention participants have an adequate understanding of physical activity intensity. The AAS is the preferred self-report measure in middle-aged adults independent of intervention.