Erratum: Kim, Y., et al. Comparison of Polar Active Watch and Waist- and Wrist-Worn ActiGraph Accelerometers for Measuring Children’s Physical Activity Levels during Unstructured Afterschool Programs. Int. J. Environ. Res. Public Health 2018, 15, 2268

Young children’s activity and sedentary time were simultaneously measured via the Actical method (i.e., Actical accelerometer and specific cut-points) and the ActiGraph method (i.e., ActiGraph accelerometer and specific cut-points) at both 15-s and 60-s epochs to explore possible differences between these 2 measurement approaches. For 7 consecutive days, participants (n = 23) wore both the Actical and ActiGraph side-by-side on an elastic neoprene belt. Device-specific cut-points were applied. Paired sample t tests were conducted to determine the differences in participants’ daily average activity levels and sedentary time (min/h) measured by the 2 devices at 15-s and 60-s time sampling intervals. Bland-Altman plots were used to examine agreement between Actical and ActiGraph accelerometers. Regardless of epoch length, Actical accelerometers reported significantly higher rates of sedentary time (15 s: 42.7 min/h vs 33.5 min/h; 60 s: 39.4 min/h vs 27.1 min/h). ActiGraph accelerometers captured significantly higher rates of moderate-to-vigorous physical activity (15 s: 9.2 min/h vs 2.6 min/h; 60 s: 8.0 min/h vs 1.27 min/h) and total physical activity (15 s: 31.7 min/h vs 22.3 min/h; 60 s: = 39.4 min/h vs 25.2 min/h) in comparison with Actical accelerometers. These results highlight the present accelerometry-related issues with interpretation of datasets derived from different monitors.

Download Full-text

Impact of parents’ physical activity on preschool children’s physical activity: a cross-sectional study

PeerJ ◽

10.7717/peerj.4405 ◽

2018 ◽

Vol 6 ◽

pp. e4405 ◽

Cited By ~ 8

Author(s):

Chang Xu ◽

Minghui Quan ◽

Hanbin Zhang ◽

Chenglin Zhou ◽

PeiJie Chen

Keyword(s):

Physical Activity ◽

Sedentary Behavior ◽

Vigorous Physical Activity ◽

Cross Sectional Study ◽

Maternal Influence ◽

Activity Levels ◽

Cross Sectional ◽

Physical Activity Levels ◽

Paternal Influence ◽

Children’S Physical Activity

Purpose This study examined the associations of physical activity levels between parents and their pre-school children based on gender and weekday/weekend. Method A total of 247 parent-preschool child triads from Shanghai, China were analyzed. The children had a mean age of 57.5 ± 5.2 months. Both sedentary behavior and physical activity were measured in all participants using an ActiGraph GT3X+ accelerometer over seven consecutive days from Monday through the following Sunday. A multivariate regression model was derived to identify significant relationships between parental and child physical activity according to gender and weekday/weekend. Results There was a significant correlation between mothers’ and girls’ moderate-to-vigorous physical activity (MVPA) and total physical activity (TPA) on weekdays. Fathers’ MPVA levels correlated significantly with those of boys and girls, with paternal influence appearing to be stronger than maternal influence. However, there was not a significant correlation between fathers’ and children’s TPA. TPA levels of both mothers and fathers correlated with those of girls, but not with those of boys. Parental sedentary levels on the weekend correlated significantly with girls’ levels, but not with boys’ levels. Children’s physical activity levels on weekends were influenced more by fathers’ activity levels than by mothers’, while the opposite was observed on weekdays. Conclusion Sedentary behavior and physical activity levels of parents can strongly influence those of their preschool children, with maternal influence stronger during the weekdays and paternal influence stronger on the weekends. Parents’ activity levels influence girls’ levels more strongly than they influence boys’ levels.

Download Full-text

Physical Activity in Preschool Children With the Transition to Outdoors

Journal of Physical Activity and Health ◽

10.1123/jpah.10.2.170 ◽

2013 ◽

Vol 10 (2) ◽

pp. 170-175 ◽

Cited By ~ 22

Author(s):

Russell R. Pate ◽

Marsha Dowda ◽

William H. Brown ◽

Jonathan Mitchell ◽

Cheryl Addy

Keyword(s):

Physical Activity ◽

Time Course ◽

Outdoor Play ◽

Activity Levels ◽

Physically Active ◽

Minute Period ◽

Physical Activity Levels ◽

Trained Observers ◽

Children’S Physical Activity ◽

Observation Period

Background:It is known that children are more physically active outdoors than indoors. However, few previous studies have observed the time course for physical activity as young children transition from indoor to outdoor activities.Methods:Participants were 3- to 5-year-old children enrolled in the Children’s Activity and Movement in Preschool Study (CHAMPS). Trained observers used the Observational System for Recording Physical Activity in Children-Preschool Version (OSRAC-P) to record children’s physical activity levels over 20 minutes in outdoor settings. The 20-minute outdoor observational period began immediately following the transition from indoors to outdoors.Results:Children’s activity levels were moderately high at the time of transition and declined over the 20-minute observation period. Different patterns, however, were observed for boys and girls. Overall, boys were more active than girls. Boys’ activity levels declined in a linear fashion over the 20-minute period, while girls’ activity levels increased slightly, decreased, and then increased slightly again.Conclusions:These data indicate that physical activity levels decline with increased duration of outdoor play. The frequency and duration of outdoor play should be investigated for the purpose of optimizing physical activity levels.

Download Full-text

Application and Validation of Activity Monitors’ Epoch Lengths and Placement Sites for Physical Activity Assessment in Exergaming

Journal of Clinical Medicine ◽

10.3390/jcm7090268 ◽

2018 ◽

Vol 7 (9) ◽

pp. 268 ◽

Cited By ~ 14

Author(s):

Jungyun Hwang ◽

Austin Fernandez ◽

Amy Lu

Keyword(s):

Physical Activity ◽

Heart Rate ◽

Intraclass Correlation ◽

Activity Levels ◽

Physical Activity Intensity ◽

Activity Monitors ◽

Epoch Length ◽

Activity Intensity ◽

Physical Activity Levels ◽

Rate Sensor

We assessed the agreement of two ActiGraph activity monitors (wGT3X vs. GT9X) placed at the hip and the wrist and determined an appropriate epoch length for physical activity levels in an exergaming setting. Forty-seven young adults played a 30-min exergame while wearing wGT3X and GT9X on both hip and wrist placement sites and a heart rate sensor below the chest. Intraclass correlation coefficient indicated that intermonitor agreement in steps and activity counts was excellent on the hip and good on the wrist. Bland-Altman plots indicated good intermonitor agreement in the steps and activity counts on both placement sites but a significant intermonitor difference was detected in steps on the wrist. Time spent in sedentary and physical activity intensity levels varied across six epoch lengths and depended on the placement sites, whereas time spent from a 1-s epoch of the hip-worn monitors most accurately matched the relative exercise intensity by heart rate. Hip placement site was associated with better step-counting accuracy for both activity monitors and more valid estimation of physical activity levels. A 1-s epoch was the most appropriate epoch length to detect short bursts of intense physical activity and may be the best choice for data processing and analysis in exergaming studies examining intermittent physical activities.

Download Full-text