Limits...
Sources and magnitude of variability in pedometer-determined physical activity levels of youth.

Kim SY, Park HS - J Exerc Rehabil (2015)

Bottom Line: Primary sources of variability were variance components of the person and person by day interaction.Minimum numbers of days required for estimating habitual physical activity levels using a pedometer were five during weekdays.However, estimating habitual physical activity levels during weekends, and weekdays and weekend days combined was impractical.

View Article: PubMed Central - PubMed

Affiliation: Department of Kinesiology and Physical Education, College of Education, Northern Illinois University, DeKalb, IL, USA.

ABSTRACT
This study examined sources of variability in habitual physical activity of children, and the minimum number of days required for estimating children's habitual physical activity levels using pedometers. A total of 31 children wore two pedometers during five weekdays and four weekend days. A two random facet completely crossed design was conducted with two-way analysis of variances across weekdays, weekends, and weekdays and weekend days combined. Moderate/high generalizability coefficients were estimated across all days. Primary sources of variability were variance components of the person and person by day interaction. Minimum numbers of days required for estimating habitual physical activity levels using a pedometer were five during weekdays. However, estimating habitual physical activity levels during weekends, and weekdays and weekend days combined was impractical.

No MeSH data available.


Estimated phi coefficients across days using one pedometer.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4697786&req=5

f1-jer-11-6-363: Estimated phi coefficients across days using one pedometer.

Mentions: To achieve sufficient reliability (G≥0.80, phi≥0.80) in the measurement of HPA during weekdays, measurements need to be obtained on at least five days using a pedometer. To determine HPA levels of children during weekend days, at least nine weekend days of measurement using a pedometer was estimated to be required. When data from weekdays and weekends were combined, at least 14 days of measurements using three pedometers were needed. Fig. 1 shows estimated phi coefficients across days using one pedometer.


Sources and magnitude of variability in pedometer-determined physical activity levels of youth.

Kim SY, Park HS - J Exerc Rehabil (2015)

Estimated phi coefficients across days using one pedometer.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4697786&req=5

f1-jer-11-6-363: Estimated phi coefficients across days using one pedometer.
Mentions: To achieve sufficient reliability (G≥0.80, phi≥0.80) in the measurement of HPA during weekdays, measurements need to be obtained on at least five days using a pedometer. To determine HPA levels of children during weekend days, at least nine weekend days of measurement using a pedometer was estimated to be required. When data from weekdays and weekends were combined, at least 14 days of measurements using three pedometers were needed. Fig. 1 shows estimated phi coefficients across days using one pedometer.

Bottom Line: Primary sources of variability were variance components of the person and person by day interaction.Minimum numbers of days required for estimating habitual physical activity levels using a pedometer were five during weekdays.However, estimating habitual physical activity levels during weekends, and weekdays and weekend days combined was impractical.

View Article: PubMed Central - PubMed

Affiliation: Department of Kinesiology and Physical Education, College of Education, Northern Illinois University, DeKalb, IL, USA.

ABSTRACT
This study examined sources of variability in habitual physical activity of children, and the minimum number of days required for estimating children's habitual physical activity levels using pedometers. A total of 31 children wore two pedometers during five weekdays and four weekend days. A two random facet completely crossed design was conducted with two-way analysis of variances across weekdays, weekends, and weekdays and weekend days combined. Moderate/high generalizability coefficients were estimated across all days. Primary sources of variability were variance components of the person and person by day interaction. Minimum numbers of days required for estimating habitual physical activity levels using a pedometer were five during weekdays. However, estimating habitual physical activity levels during weekends, and weekdays and weekend days combined was impractical.

No MeSH data available.