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Title: Effects of reallocating time in different activity intensities on health and fitness: a cross sectional study
Authors: Aggio, Daniel
Smith, Lee
Hamer, Mark
Keywords: Sedentary behaviour
Physical activity
Isotemporal substitution
Issue Date: 2015
Publisher: ©The authors. Published by Biomed Central LTD
Citation: AGGIO, D., SMITH, L. and HAMER, M., 2015. Effects of reallocating time in different activity intensities on health and fitness: a cross sectional study. International Journal of Behavioral Nutrition and Physical Activity, 12:83.
Abstract: Background: The effects of replacing time in specific activity categories for other categories (e.g. replacing sedentary time with light activity) on health and fitness are not well known. This study used isotemporal substitution to investigate the effects of substituting activity categories in an equal time exchange fashion on health and fitness in young people. Methods: Participants were drawn from schools in Camden, London (n = 353, mean age 9.3 ± 2.3 years). Time sedentary, in light and in moderate-to-vigorous activity (MVPA) was measured via accelerometry. The effects of substituting time in activity categories (sedentary, light and MVPA) with equivalent time in another category on health and fitness were examined using isotemporal substitution. Results: In single and partition models, MVPA was favourably associated with body fat %, horizontal jump distance and flexibility. Time sedentary and in light activity were not associated with health and fitness outcomes in these models. In substitution models, replacing one hour of sedentary time with MVPA was favourably associated with body fat % (B = −4.187; 95 % confidence interval (CI), −7.233, −1.142), horizontal jump distance (B = 16.093; 95 % CI, 7.476, 24.710) and flexibility (B = 4.783; 95 % CI, 1.910, 7.656). Replacing time in light activity with MVPA induced similar benefits but there were null effects for replacing sedentary with light intensity. Conclusion: Substituting time sedentary and in light activity with MVPA was associated with favourable health and fitness. Time in sedentary behaviour may only be detrimental to health and fitness when it replaces time in MVPA in young people.
Description: This is an Open Access Article. It is published by BioMed Central Ltd. under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: This work was supported by a grant from the Economic Social Research Council [grant number ES/M003795/1].
Version: Published
DOI: 10.1186/s12966-015-0249-6
URI: https://dspace.lboro.ac.uk/2134/19092
Publisher Link: http://dx.doi.org/10.1186/s12966-015-0249-6
ISSN: 1479-5868
Appears in Collections:Published Articles (Sport, Exercise and Health Sciences)

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