Abstract
Purpose: To evaluate the validity of the Previous Day Physical Activity Recall (PDPAR) as a physical activity diary in adolescents using two accelerometer intensity classifications. Methods: One hundred eighth graders (47 boys, 53 girls) used the PDPAR as a daily diary and wore MTI accelerometers for four consecutive days. Measured time spent in moderate (≥3 METs) and vigorous (≥6 METs) activity was based on two published MTI cut-point limits (that of Freedson et al./Trost et al. and that of Puyau et al.). Spearman rank order correlations and Bland-Altman plots were used to examine agreement between MTI and PDPAR diary estimates of activity. Results: MTI estimates of mean minutes per day of total moderate to vigorous physical activity (MVPA) were 65.2 (±43.2) using the Freedson et al./Trost et al. cutoffs and 17.5 (±18.5) using those of Puyau et al., while students self-reported 105.1 (±80.1) min·d-1. Significant relationships were observed between the diary and MTI for total MVPA using either the Freedson et al./Trost et al. (r = 0.42) or Puyau et al. (r = 0.41) cutoff as well as raw counts (r = 0.44). Plots showed reasonable agreement between the diary and Freedson et al./Trost et al. MTI estimates of MVPA for daily totals of ≤60 min, but the Puyau et al. estimates were consistently lower. Diaries overestimated activity as time increased when compared to either MTI cut point, especially on vigorous activity. Conclusions: Time estimates of MVPA differed by assessment tool, but diary estimates showed adequate association with the MTI. Diaries reflected intensity-specific activity, corresponding most closely with the Freedson et al./Trost et al. classification of moderate, but substantially overestimated vigorous activity regardless of cut-point method. This is likely due to the measurement characteristics of the PDPAR, which classifies activities in 30-min blocks, as well as the nature of common activities in which high levels of intensity are not sustained.
Original language | English (US) |
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Pages (from-to) | 1224-1230 |
Number of pages | 7 |
Journal | Medicine and science in sports and exercise |
Volume | 37 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2005 |
Keywords
- Log
- Measurement
- MTI
- Physical activity
- Reliability
ASJC Scopus subject areas
- Orthopedics and Sports Medicine
- Physical Therapy, Sports Therapy and Rehabilitation