4 time-use clusters were found in children: ‘Studious Actives’ had the best and ‘Potterers’ the worst Health Related Quality of Life - ‘Techno Actives’ and ‘Stay-home Screenies’ were in the middle.
- Wong M, Olds T, Gold L, Lycett K, Dumuid D, Muller J, et al. Time-Use patterns and health-related quality of life in adolescents. Pediatrics. 2017;140(1). DOI: 10.1542/peds.2016-3656
In early adolescence, each additional hour of moderate-vigorous physical activity (MVPA) is associated with small increases in bone size and strength; and sedentary activity had little impact on bone.
- Osborn W, Simm P, Olds T, Lycett K, Mensah FK, Muller J, et al. Bone health, activity and sedentariness at age 11-12 years: Cross-sectional Australian population-derived study. Bone. 2018;112(153-160). DOI: 10.1016/j.bone.2018.04.011
Decreasing MVPA by 15 minutes had larger impacts on body composition than increasing MVPA by 15 minutes; body composition changes were not symmetrical.
- Dumuid D, Wake M, Clifford S, Burger D, Carlin JB, Mensah FK, et al. The association of the body composition of children with 24-hour activity composition. Journal of Pediatrics. Published online 4 February 2019. DOI:10.1016/j.jpeds.2018.12.030
While most parents and children show adequate sleep duration, poor quality (low efficiency) sleep is common.
- Matricciani L, Fraysse F, Grobler AC, Muller J, Wake M, and Olds T. Sleep: population epidemiology and concordance in Australian children aged 11-12 years and their parents.BMJ Open. 2019. 9(Suppl 3): p. 127-135. DOI: 10.1136/bmjopen-2017-020895.
More parents than children met physical activity guidelines, despite parents having lower mean activity counts, indicating a need to coordinate meaningful definitions across age groups.
- Fraysse F, Grobler AC, Muller J, Wake M, and Olds T. Physical activity and sedentary activity: population epidemiology and concordance in Australian children aged 11-12 years and their parents. BMJ Open. 2019. 9(Suppl 3): p. 136-146. DOI: 10.1136/bmjopen-2018-023194.
Adverse sleep characteristics may play a limited role in shortening of telomeres in generally healthy populations up to at least
- Nguyen MT, Lycett K, Olds T, Matricciani L, Vryer R, Ranganathan S, et al. Objectively measured sleep and telomere length in a population-based cohort of children and midlife adults. Sleep.2019; pii: zsz200. DOI: 10.1093/sleep/zsz200.
This study describes the Goldilocks “just right” daily durations of physical activity (moderate-to-vigorous and light intensities), sedentary time and sleep that are associated with the best skeletal health in children.
- Dumuid D, Simm P, Wake M, Burgner D, Juonala M, Wu F, et al. The "Goldilocks Day" for Children's Skeletal Health: Compositional Data Analysis of 24-Hour Activity Behaviors. J Bone Miner Res. 2020 Jul 30. doi: 10.1002/jbmr.4143. Epub ahead of print. PMID: 32730680.
MVPA is 2 to 6 times as potent as sleep or sedentary time for children’s health: a 0.1SD decrease in adiposity is associated with 52 minutes more sleep or 56 minutes less sitting, which is equivalent to just 17 minutes more MVPA.
- Ng E, Wake M, Olds T, Lycett K, Edwards B, Le H, Dumuid D. Equivalence Curves for Healthy Lifestyle Choices. Pediatrics. 2021 Mar 26:e2020025395. doi: 10.1542/peds.2020-025395. Epub ahead of print. PMID: 33771915.