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Relationships between sleep duration, physical activity and body mass index in young New Zealanders: an isotemporal substitution analysis

del Pozo-Cruz, Borja, Gant, Nicholas, del Pozo-Cruz, Jesús and Maddison, Ralph 2017, Relationships between sleep duration, physical activity and body mass index in young New Zealanders: an isotemporal substitution analysis, PLoS one, vol. 12, no. 9, pp. 1-12, doi: 10.1371/journal.pone.0184472.

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Title Relationships between sleep duration, physical activity and body mass index in young New Zealanders: an isotemporal substitution analysis
Author(s) del Pozo-Cruz, Borja
Gant, Nicholas
del Pozo-Cruz, Jesús
Maddison, RalphORCID iD for Maddison, Ralph orcid.org/0000-0001-8564-5518
Journal name PLoS one
Volume number 12
Issue number 9
Article ID e0184472
Start page 1
End page 12
Total pages 12
Publisher Public Library of Science
Place of publication San Francisco, Calif.
Publication date 2017-09-12
ISSN 1932-6203
Keyword(s) sedentary behaviour
obesity
children
physical activity
body mass index
BMI
New Zealand children
science and technology
Summary BACKGROUND: The evidence regarding the unique effect of sedentary behaviour on obesity among children is unclear. Moreover, the effect of substituting sedentary behaviour with physical activity of different intensities on the body composition of children has received limited empirical study.

OBJECTIVE: To examine the mathematical effects on Body Mass Index (BMI) of substituting sedentary behaviours with physical activities of different intensities on children and youth aged 5-14 years old in New Zealand.

METHODS: Secondary analysis of accelerometer data from the National Survey of Children and Young People's Physical Activity and Dietary Behaviours in New Zealand (2008/09) was conducted. A total of 1812 children and youth aged 5-24 years provided accelerometer-derived data on daily sedentary time (SB), light intensity physical activity (LPA) and moderate to vigorous physical activity (MVPA). Sleep time was assessed with a validated computerised use-of-time tool. BMI was assessed using anthropometric measurements. Multiple linear regression models were used to examine the independent associations of SB, Sleep time, LPA, and MVPA on BMI. The isotemporal substitution approach was used to ascertain the mathematical effect of substituting each of the other behaviours on BMI. Analyses were stratified by age groups.

RESULTS: SB showed a unique (inverse) association with BMI across all age groups (p<0.05) but 20-24 years (p>0.05). Similarly, MVPA was positively associated (p<0.001) across all age groups. Among age groups 5-9 years, 10-14 years and 15-19 years, the estimated impact of replacing 60 min/day of SB with the same amount of MVPA time resulted in decreased BMI for all age groups (p<0.001), ranging from -1.26 (5-9 years) to -1.43 units (15-19 years). Similar results were achieved when SB was replaced with LPA or sleeping time for children (5-19 years). In young people (age group 20-24), the impact of replacing 30 min/day of SB with MVPA resulted in an estimated -1 BMI units decrease (p<0.001).

CONCLUSION: MVPA and SB have a unique effect on BMI. Further, substituting SB with LPA or MVPA was associated with a favourable effect on BMI across all age groups; with MVPA having the strongest association.
Language eng
DOI 10.1371/journal.pone.0184472
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
MD Multidisciplinary
Socio Economic Objective 920401 Behaviour and Health
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2017, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30102671

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.