Vrieling, L. (2012) Examining physical activity in children aged 8-12 years old: triaxial and uniaxial accellerometry. thesis, Human Movement Sciences.
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Abstract
Purpose: The purpose of the present study was threefold: 1) to describe children's physical activity using triaxial vector magnitude (VM) and to compare these data with uniaxial counts, 2) to characterize children's physical activity across week and weekend days and in boys and girls, and 3) to establish the number of children that met the recommendation of 60 minutes of moderate-to-vigorous physical activity (MVP A) per day. Methods: A total of 86 children (M=9.34±1.13; 43 boys, 43 girls) from two primary schools in northern Netherlands participated in the present study and were asked to wear the GT3X + Actigraph accelerometer for seven consecutive days. Children were included if 9 hours of valid data per day were measured between 6 am and 12 pm for five days in the week including one weekend day. Results: Forty-eight children (M=9.19±1.14; 20 boys, 28 girls) met the inclusion criteria and were included in the analyses. Results showed that triaxial VM counts were significantly higher compared uniaxial counts. The triaxial mean counts per minute was minimal 2 times higher than uniaxial mean counts per minute. Furthermore, children were more active in the weekend compared to the weekdays. Boys spent significantly more time in MVP A and were more active than girls during the week days. Finally, 2.4% of the children met the guideline of 60 minutes MVP A per day. Conclusion: Triaxial accelerometers provide more accurate information of children's physical activity compared to uniaxial accelerometers. In addition, children in the present sample engage in insufficient physical activity and are in need of a health promoting physical activity program during schooldays to decrease sedentary behavior and to increase time spent in MVPA.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Hartman Dr. E. and and Smith, Dr. J. and Centre for Human Movement Sciences, University of Groningen |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 10:44 |
| Last Modified: | 25 Jun 2020 10:44 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/552 |
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