Accumulation of Physical activity in primary school children: The Healthy Lifestyles Programme (HeLP)

Transcription

1 Accumulation of Physical activity in primary school children: The Healthy Lifestyles Programme (HeLP) Dr. Lisa Price, Dr. Jenny Lloyd, Dr. Katrina Wyatt, Dr. Melvyn Hillsdon

2 Background All children and young people should engage in moderate to vigorous intensity physical activity for at least 60 minutes and up to several hours every day. DoH 2011

3 How is it accumulated Multiple short burst Continuous bouts Aim 1 : Examine accumulation of physical activity in bout lengths for males and females

4 How do we assess meeting the guidelines Average time Each day Van Sluijs et al., 2008 Esliger & Hall, 2008 Aim 2 : Examine % of children meeting DoH guidelines using two different methods of assessment

5 Method 887 children randomised to receive GENEActiv 8 days (1 familiarisation day) Collected at 85.7 Hz Processed using GGIR package in R (van Hees et al.,) 4 days (inc 1 weekend day) 10 hours of valid wear Cuts from Phillips et al., 2013 Analysed in Stata 14.0

6 Outcome variables ENMO (mg) - x 2 + y 2 + z 2-1 Time in PA intensities Total time in activity MVPA Bursts 1 second epochs Bouts 1min, 5 mins, 10 mins Meeting activity guidelines Daily / average

7 Compliance 887 randomised to receive GENEActiv 852 files available to analyse 830 met the inclusion criteria 10 hours on 4 days Criteria 10 hours on: Compliance 4 days % 5 days % 6 days % 7 days %

8 Results Time (mins) spent in activity intensities (n=830) Mean (SD) Median (IQR) ENMO (mg) 49.3 (11.1) 47.8 (14.2) Total PA ( light) (mins) (35.7) (48.9) Light PA (mins) (24.4) (32.1) Mod PA (mins) 40.2 (11.7) 39.0 (15.5) Vig PA (mins) 13.4 (6.17) 12.1 (7.7) MVPA (mins) 53.6 (16.5) 51.4 (21.8)

9 Time (minutes) Time (minutes) Median time spent in total activity by bout length (n=830) second 1 minute 5 minutes 10 minutes Bout length Median time spent in MVPA by bout length (n=830) second 1 minute 5 minutes 10 minutes Bout length

10 Time (mins) Median time spent in total activity by bout length by gender ** Males 200 Females ** ** ** 0 1 second 1 minute 5 minute 10 minute Bout length

11 Median time (minutes) spent in MVPA activity by bout length by gender N Median IQR Z p 1 second Males Females < minute Males Females < minute Males Females <0.001

12 Meeting DoH guidelines Inclusion criteria: participants with 7 days of data (10hours) Total Males Females n % n % n % Average 60 mins mins on each day

13 Conclusions High compliance with wear time criteria Better estimation of children s habitual PA Most PA accumulated in < 1 minute bouts Boys have higher total and bouted PA Previous estimate of % meeting guidelines may have over estimated

14 Where next? Consensus on interpretation of DoH guidelines? Do accumulation patterns change across different groups of children? Overweight SES Do accumulation patterns have different relationships to health outcomes? What patterns are most beneficial?

15 Dr Jenny Lloyd Dr Katrina Wyatt Gen Cook Ali Hurst Dr Lisa Price Senior Research Associate HeLP Data Manager Physical Activity Fellow Professor Administrator Coordinator Helen Eke Camilla McHugh Jackie Minton Chloe Thomas HeLP Coordinator HeLP Coordinator HeLP Coordinator HeLP Coordinator

16 Thank you Department of Health (2011). Start active, Stay Active, A report on physical activity for health from the four home countries Chief Medical Officers. Phillips, L.R.S., Parfitt, G., & Rowlands, A.V. (2013). Calibration of the GENEA accelerometer for assessment of physical activity intensity in children. Journal of Science and Medicine in Sport, 16 (2), doi: /j.jsams Esliger, D. & Hall, J. (2008). Accelerometry in children. In R.Craig, J. Mindell & V. Hirani (Eds) Health survey forengland 2008: Physical activity and fitness (volume 1). London, UK: The NHS Information Centre for health and social care. Van Sluijs, E., Skidmore, P.M.L., Jones, A., Callaghan, A.M., Ekelund, U., Harrison, F., Harvey, I., Panter, J., Wareham, N., Cassidy, A. & Griffin, S.J. (2008). Physical activity and dietary behaviour in a population-based sample of British 10-year old children: the SPEEDY study (Sport, Physical activity and Eating behaviour: Environmental Determinants in Young people). BMC Public health, 8, 388 VT van Hees ZF, JH Zhao, S Package GGIR. In.; 2015: A package to process multi-day raw accelerometer data.