Abstract
Aim: To examine cross-sectional associations of children's bone health (size, density, strength) with moderate-vigorous physical activity (MVPA) and sedentary behaviour by considering: (1) duration of activity, (2) fragmentation, and (3) duration/fragmentation combined. Methods: Design: Population-based cross-sectional study. Participants: 11–12 year-olds in the Longitudinal Study of Australian Children's Child Health CheckPoint. Exposures: MVPA and sedentary behaviour (7-day accelerometry), yielding (1) daily average durations (min/day) and (2) fragmentations (the parameter alpha, representing the relationship between activity bout frequency and bout length). Outcomes: Tibial peripheral quantitative computed tomography (bone density, geometry, strength). Analysis: Multivariable regression models including activity durations and fragmentations separately and combined. Results: Of 1357 children attending the CheckPoint, 864 (64%) provided both bone and accelerometry data (mean age 11.4 years (standard deviation (SD) 0.5); 49% male). Mean daily MVPA and sedentary behaviour durations were 34.4 min/day (SD 28.3) and 667.9 min/day (SD 71.9) respectively for boys and girls combined. Each additional daily hour of MVPA was associated with small bone health benefits comprising greater periosteal and endosteal circumference (standardised effect sizes 0.25, 95% CI 0.10 to 0.40 and 0.21, 95% CI 0.03 to 0.39, respectively) and bone strength (0.26, 95% CI 0.14 to 0.38). Sedentary duration and fragmentation of either MVPA or sedentary behaviour showed little association with bone health. Conclusions: In early adolescence, MVPA duration showed associations with better bone health that, while modest, could be of population-level importance. MVPA fragmentation and sedentary behaviour duration and fragmentation seemed less important.
| Language | English |
|---|---|
| Pages | 153-160 |
| Number of pages | 8 |
| Journal | Bone |
| Volume | 112 |
| DOIs | |
| Publication status | Published - 1 Jul 2018 |
Keywords
- Accelerometry
- Adolescents
- Bone health
- Physical activity
- Sedentary behaviour
- pQCT
ASJC Scopus subject areas
- Endocrinology, Diabetes and Metabolism
- Physiology
- Histology
Cite this
}
Bone health, activity and sedentariness at age 11–12 years : Cross-sectional Australian population-derived study. / Osborn, William; Simm, Peter; Olds, Tim; Lycett, Kate; Mensah, Fiona K.; Muller, Josh; Fraysse, Francois; Ismail, Najmi; Vlok, Jennifer; Burgner, David; Carlin, John B.; Edwards, Ben; Dwyer, Terence; Azzopardi, Peter; Ranganathan, Sarath; Wake, Melissa.
In: Bone, Vol. 112, 01.07.2018, p. 153-160.Research output: Contribution to journal › Article
TY - JOUR
T1 - Bone health, activity and sedentariness at age 11–12 years
T2 - Bone
AU - Osborn, William
AU - Simm, Peter
AU - Olds, Tim
AU - Lycett, Kate
AU - Mensah, Fiona K.
AU - Muller, Josh
AU - Fraysse, Francois
AU - Ismail, Najmi
AU - Vlok, Jennifer
AU - Burgner, David
AU - Carlin, John B.
AU - Edwards, Ben
AU - Dwyer, Terence
AU - Azzopardi, Peter
AU - Ranganathan, Sarath
AU - Wake, Melissa
PY - 2018/7/1
Y1 - 2018/7/1
N2 - Aim: To examine cross-sectional associations of children's bone health (size, density, strength) with moderate-vigorous physical activity (MVPA) and sedentary behaviour by considering: (1) duration of activity, (2) fragmentation, and (3) duration/fragmentation combined. Methods: Design: Population-based cross-sectional study. Participants: 11–12 year-olds in the Longitudinal Study of Australian Children's Child Health CheckPoint. Exposures: MVPA and sedentary behaviour (7-day accelerometry), yielding (1) daily average durations (min/day) and (2) fragmentations (the parameter alpha, representing the relationship between activity bout frequency and bout length). Outcomes: Tibial peripheral quantitative computed tomography (bone density, geometry, strength). Analysis: Multivariable regression models including activity durations and fragmentations separately and combined. Results: Of 1357 children attending the CheckPoint, 864 (64%) provided both bone and accelerometry data (mean age 11.4 years (standard deviation (SD) 0.5); 49% male). Mean daily MVPA and sedentary behaviour durations were 34.4 min/day (SD 28.3) and 667.9 min/day (SD 71.9) respectively for boys and girls combined. Each additional daily hour of MVPA was associated with small bone health benefits comprising greater periosteal and endosteal circumference (standardised effect sizes 0.25, 95% CI 0.10 to 0.40 and 0.21, 95% CI 0.03 to 0.39, respectively) and bone strength (0.26, 95% CI 0.14 to 0.38). Sedentary duration and fragmentation of either MVPA or sedentary behaviour showed little association with bone health. Conclusions: In early adolescence, MVPA duration showed associations with better bone health that, while modest, could be of population-level importance. MVPA fragmentation and sedentary behaviour duration and fragmentation seemed less important.
AB - Aim: To examine cross-sectional associations of children's bone health (size, density, strength) with moderate-vigorous physical activity (MVPA) and sedentary behaviour by considering: (1) duration of activity, (2) fragmentation, and (3) duration/fragmentation combined. Methods: Design: Population-based cross-sectional study. Participants: 11–12 year-olds in the Longitudinal Study of Australian Children's Child Health CheckPoint. Exposures: MVPA and sedentary behaviour (7-day accelerometry), yielding (1) daily average durations (min/day) and (2) fragmentations (the parameter alpha, representing the relationship between activity bout frequency and bout length). Outcomes: Tibial peripheral quantitative computed tomography (bone density, geometry, strength). Analysis: Multivariable regression models including activity durations and fragmentations separately and combined. Results: Of 1357 children attending the CheckPoint, 864 (64%) provided both bone and accelerometry data (mean age 11.4 years (standard deviation (SD) 0.5); 49% male). Mean daily MVPA and sedentary behaviour durations were 34.4 min/day (SD 28.3) and 667.9 min/day (SD 71.9) respectively for boys and girls combined. Each additional daily hour of MVPA was associated with small bone health benefits comprising greater periosteal and endosteal circumference (standardised effect sizes 0.25, 95% CI 0.10 to 0.40 and 0.21, 95% CI 0.03 to 0.39, respectively) and bone strength (0.26, 95% CI 0.14 to 0.38). Sedentary duration and fragmentation of either MVPA or sedentary behaviour showed little association with bone health. Conclusions: In early adolescence, MVPA duration showed associations with better bone health that, while modest, could be of population-level importance. MVPA fragmentation and sedentary behaviour duration and fragmentation seemed less important.
KW - Accelerometry
KW - Adolescents
KW - Bone health
KW - Physical activity
KW - Sedentary behaviour
KW - pQCT
UR - http://www.scopus.com/inward/record.url?scp=85046167389&partnerID=8YFLogxK
U2 - 10.1016/j.bone.2018.04.011
DO - 10.1016/j.bone.2018.04.011
M3 - Article
VL - 112
SP - 153
EP - 160
JO - Bone
JF - Bone
SN - 8756-3282
ER -