Physical activity, sedentary time, and fatness in a biethnic sample of young children Dr Paul Collings British Heart Foundation Immediate Postdoctoral Basic Science Research Fellow

PA patterns in preschoolers Sporadic & challenging to measure

PA patterns in preschoolers There are many viable objective devices… …but historically they have been seldom used in young children  data are limited

Limited data… …particularly in non-white and deprived populations

Limited data… …particularly in non-white and deprived populations Aim: to examine cross-sectional associations of physical activity with adiposity in young South Asian and White British children from a deprived setting

Methods Measures and analyses LEAP 333 children (55% SA origin) of mean age 3y No ethnic difference in activity profiles 4.5 h/day sedentary; 4 h/day light activity; 50 m/day MVPA Outcomes: Multilevel models (repeated-measures  participant  study) adjusted for: IMD

Results Physical activity intensity & BMI Fig 1. Associations between the cumulative awake time above vector magnitude intervals and body mass index. Statistical analyses performed using multilevel models adjusted for age, sex, ethnicity, index of multiple deprivation, monitor worn time, and season of assessment. All results are scaled to represent associations per 20 min difference in exposures. Light PA (820-3908 cpm) corresponds to the light shaded region and MVPA (≥3908 cpm) to the dark shaded region.

Results Physical activity intensity & waist circumference Fig 2. Associations between the cumulative awake time above vector magnitude intervals and waist circumference. Statistical analyses performed using multilevel models adjusted for age, sex, ethnicity, index of multiple deprivation, monitor worn time, season of assessment, and height. All results are scaled to represent associations per 20 min difference in exposures. Light PA (820-3908 cpm) corresponds to the light shaded region and MVPA (≥3908 cpm) to the dark shaded region.

Results Physical activity intensity & sum of skinfolds Fig 3. Associations between the cumulative awake time above vector magnitude intervals and sum of skinfolds. Statistical analyses performed using multilevel models adjusted for age, sex, ethnicity, index of multiple deprivation, monitor worn time, season of assessment, and height. All results are scaled to represent associations per 20 min difference in exposures. Light PA (820-3908 cpm) corresponds to the light shaded region and MVPA (≥3908 cpm) to the dark shaded region.

Sit Stand Walk Run < < < Conclusion Messages for policy and practice Inverse dose-dependent associations were found between physical activity and adiposity - first originating in the light activity region Physical activity guidelines grounded in dose-dependent relationships might be sensible and easily understood: any right-shift in the intensity distribution may be beneficial No evidence for effect modification by ethnicity suggests that physical activity is equally beneficial for adiposity levels in young South Asian and White British children Sit Stand Walk Run < < <

Med Sci Sports Exerc. 2017; 49(5): 930-938 Acknowledgements Collings PJ, Brage S, Bingham DD, et al. Physical activity, sedentary time and fatness in a biethnic sample of young children. Med Sci Sports Exerc. 2017; 49(5): 930-938