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Lisa Price, Katrina Wyatt, Jenny Lloyd, Charles Abraham, Siobhan Creanor, Sarah Dean and Melvyn Hillsdon

Purpose: The purpose of this study was to assess children’s compliance with wrist-worn accelerometry during a randomized controlled trial and to examine whether compliance differed by allocated condition or gender. Methods: A total of 886 children within the Healthy Lifestyles Programme trial were randomly allocated to wear a GENEActiv accelerometer at baseline and 18-month follow-up. Compliance with minimum wear-time criteria (≥10 h for 3 weekdays and 1 weekend day) was obtained for both time points. Chi-square tests were used to determine associations between compliance, group allocation, and gender. Results: At baseline, 851 children had usable data, 830 (97.5%) met the minimum wear-time criteria, and 631 (74.1%) had data for 7 days at 24 hours per day. At follow-up, 789 children had usable data, 745 (94.4%) met the minimum wear-time criteria, and 528 (67%) had complete data. Compliance did not differ by gender (baseline: χ2 = 1.66, P = .2; follow-up: χ2 = 0.76, P = .4) or by group at follow-up (χ2 = 2.35, P = .13). Conclusion: The use of wrist-worn accelerometers and robust trial procedures resulted in high compliance at 2 time points regardless of group allocation, demonstrating the feasibility of using precise physical activity monitors to measure intervention effectiveness.

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Lisa Price, Katrina Wyatt, Jenny Lloyd, Charles Abraham, Siobhan Creanor, Sarah Dean and Melvyn Hillsdon

Background: Physical activity guidelines state that children should achieve at least 60 minutes of moderate to vigorous physical activity (MVPA) on each day of the week. Accurate assessment of adherence to these guidelines should, ideally, include measurement over 7 days. When less than 7 days of data are available, researchers often report the average minutes of MVPA per day as a proxy for 7-day measurement. The aim of this study was to compare prevalence estimates generated by average MVPA per day versus MVPA assessed over 7 days. Methods: Data were collected as part of the Healthy Lifestyles Programme. One class from each school was randomized to wear a GENEActiv accelerometer for 8 days. The percentages of children achieving an average of ≥60 minutes of MVPA per day and those achieving ≥60 minutes of MVPA on each of 7 days were calculated. Results: A total of 807 children provided 7 days of data. When the average MVPA per day was calculated, 30.6% (n = 247) of children accumulated ≥60 minutes of MVPA per day. Only 3.2% (n = 26) accumulated ≥60 minutes of MVPA on every day of the week. Conclusion: Previous studies utilizing average MVPA per day are likely to have overestimated the percentage of children meeting recommendations.

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Simani M. Price, Judith McDivitt, Deanne Weber, Lisa S. Wolff, Holly A. Massett and Janet E. Fulton

Background:

Despite the potential benefits of reducing the risk of osteoporosis in later life, research on adolescent girls’ weight-bearing physical activity (WBPA) is limited. This study explores correlates for WBPA in this population.

Methods:

A nationally representative telephone survey sponsored by the National Bone Health Campaign was conducted with 1000 girls age 9 to 12 years and a parent. Girls’ physical activities were coded as weight bearing or not and correlated with cognitive, social, and environmental variables.

Results:

Regression analysis revealed that WBPA was significantly associated with self-reported parents’ education, parental self-efficacy, girls’ normative beliefs about time spent in physical activity, being physically active with a parent, having physically active friends, and perceived availability of after-school physical activities.

Conclusions:

Interventions encouraging parents to participate in WBPA with their daughters and increasing parents’ positive attitudes and self-efficacy in getting their daughters to be physically active should be tested.