BACKGROUND: Pedometer step-frequency thresholds (120 steps·min-1, SPM) corresponding to moderate-to vigorous intensity physical activity (MVPA) have been proposed for youth. Pedometers now have internal mechanisms to record time spent at or above a user-specified SPM. If pedometers provide comparable MVPA (P-MVPA) estimates to those from accelerometry, this would have broad application for research and the general public. The purpose of this study was to examine the convergent validity of P-MVPA to accelerometer-MVPA for youth. METHODS: Youth (N = 149, average 8.6 years, range 5 to 14 years, 60 girls) wore an accelerometer (5-sec epochs) and a pedometer for an average of 5.7 ± 0.8 hours·day-1. The following accelerometer cutpoints were used to compare P-MVPA: Treuth (TR), Mattocks (MT), Evenson (EV), Puyau (PU), and Freedson (FR) child equation. Comparisons between MVPA estimates were performed using Bland-Altman plots and paired t tests. RESULTS: Overall, P-MVPA was 24.6 min ± 16.7 vs. TR 25.2 min ± 16.2, MT 18.8 min ± 13.3, EV 36.9 min ± 21.0, PU 22.7 min ± 15.1, and FR 50.4 min ± 25.5. Age-specific comparisons indicated for 10 to 14 year-olds MT, PU, and TR were not significantly different from P-MVPA; for the younger children (5-8 year- olds) P-MVPA consistently underestimated MVPA. CONCLUSIONS: Pedometer-determined MVPA provided comparable estimates of MVPA for older children (10-14 year-olds). Additional work is required to establish age appropriate SPM thresholds for younger children.
BACKGROUND: Pedometer step-frequency thresholds (120 steps·min-1, SPM) corresponding to moderate-to vigorous intensity physical activity (MVPA) have been proposed for youth. Pedometers now have internal mechanisms to record time spent at or above a user-specified SPM. If pedometers provide comparable MVPA (P-MVPA) estimates to those from accelerometry, this would have broad application for research and the general public. The purpose of this study was to examine the convergent validity of P-MVPA to accelerometer-MVPA for youth. METHODS: Youth (N = 149, average 8.6 years, range 5 to 14 years, 60 girls) wore an accelerometer (5-sec epochs) and a pedometer for an average of 5.7 ± 0.8 hours·day-1. The following accelerometer cutpoints were used to compare P-MVPA: Treuth (TR), Mattocks (MT), Evenson (EV), Puyau (PU), and Freedson (FR) child equation. Comparisons between MVPA estimates were performed using Bland-Altman plots and paired t tests. RESULTS: Overall, P-MVPA was 24.6 min ± 16.7 vs. TR 25.2 min ± 16.2, MT 18.8 min ± 13.3, EV 36.9 min ± 21.0, PU 22.7 min ± 15.1, and FR 50.4 min ± 25.5. Age-specific comparisons indicated for 10 to 14 year-olds MT, PU, and TR were not significantly different from P-MVPA; for the younger children (5-8 year- olds) P-MVPA consistently underestimated MVPA. CONCLUSIONS: Pedometer-determined MVPA provided comparable estimates of MVPA for older children (10-14 year-olds). Additional work is required to establish age appropriate SPM thresholds for younger children.
Authors: Keith Brazendale; Michael W Beets; R Glenn Weaver; Jessica L Chandler; Allison B Randel; Gabrielle M Turner-McGrievy; Justin B Moore; Jennifer L Huberty; Dianne S Ward Journal: Am J Prev Med Date: 2017-02-16 Impact factor: 5.043
Authors: R Glenn Weaver; Keith Brazendale; Jessica L Chandler; Gabrielle M Turner-McGrievy; Justin B Moore; Jennifer L Huberty; Dianne S Ward; Michael W Beets Journal: PLoS One Date: 2017-03-28 Impact factor: 3.240
Authors: Keith Brazendale; Michael W Beets; R Glenn Weaver; Gabrielle M Turner-McGrievy; Justin B Moore; Jennifer L Huberty; Dianne S Ward Journal: Prev Med Rep Date: 2020-01-14
Authors: Rafael M Tassitano; R Glenn Weaver; Maria Cecília M Tenório; Keith Brazendale; Michael W Beets Journal: Int J Behav Nutr Phys Act Date: 2020-12-04 Impact factor: 6.457
Authors: Travis John Saunders; Casey Ellen Gray; Michael Marc Borghese; Allison McFarlane; Afekwo Mbonu; Zachary Michael Ferraro; Mark Stephen Tremblay Journal: BMC Public Health Date: 2014-05-28 Impact factor: 3.295