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Published in: Sports Medicine 4/2017

Open Access 01-04-2017 | Original Research Article

Cross-Sectional Associations of Objectively-Measured Physical Activity and Sedentary Time with Body Composition and Cardiorespiratory Fitness in Mid-Childhood: The PANIC Study

Authors: Paul J. Collings, Kate Westgate, Juuso Väistö, Katrien Wijndaele, Andrew J. Atkin, Eero A. Haapala, Niina Lintu, Tomi Laitinen, Ulf Ekelund, Soren Brage, Timo A. Lakka

Published in: Sports Medicine | Issue 4/2017

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Abstract

Background

The minimum intensity of physical activity (PA) that is associated with favourable body composition and cardiorespiratory fitness (CRF) remains unknown.

Objective

To investigate cross-sectional associations of PA and sedentary time (ST) with body composition and CRF in mid-childhood.

Methods

PA, ST, body composition and CRF were measured in a population-based sample of 410 children (aged 7.6 ± 0.4 years). Combined heart-rate and movement sensing provided estimates of PA energy expenditure (PAEE, kJ/kg/day) and time (min/day) at multiple fine-grained metabolic equivalent (MET) levels, which were also collapsed to ST and light PA (LPA), moderate PA (MPA) and vigorous PA (VPA). Fat mass index (FMI, kg/m2), trunk fat mass index (TFMI, kg/m2) and fat-free mass index (FFMI, kg/m2.5) were derived from dual-energy X-ray absorptiometry. Maximal workload from a cycle ergometer test provided a measure of CRF (W/kg FFM). Linear regression and isotemporal substitution models were used to investigate associations.

Results

The cumulative time above 2 METs (221 J/min/kg) was inversely associated with FMI and TFMI in both sexes (p < 0.001) whereas time spent above 3 METs was positively associated with CRF (p ≤ 0.002); CRF increased and adiposity decreased dose-dependently with increasing MET levels. ST was positively associated with FMI and TFMI (p < 0.001) but there were inverse associations between all PA categories (including LPA) and adiposity (p ≤ 0.002); the magnitude of these associations depended on the activity being displaced in isotemporal substitution models but were consistently stronger for VPA. PAEE, MPA and to a greater extent VPA, were all positively related to CRF (p ≤ 0.001).

Conclusions

PA exceeding 2 METs is associated with lower adiposity in mid-childhood, whereas PA of 3 METs is required to benefit CRF. VPA was most beneficial for fitness and fatness, from a time-for-time perspective, but displacing any lower-for-higher intensity may be an important first-order public health strategy.
Clinical trial registry number (website): NCT01803776 (https://​clinicaltrials.​gov/​ct2/​show/​NCT01803776).
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Metadata
Title
Cross-Sectional Associations of Objectively-Measured Physical Activity and Sedentary Time with Body Composition and Cardiorespiratory Fitness in Mid-Childhood: The PANIC Study
Authors
Paul J. Collings
Kate Westgate
Juuso Väistö
Katrien Wijndaele
Andrew J. Atkin
Eero A. Haapala
Niina Lintu
Tomi Laitinen
Ulf Ekelund
Soren Brage
Timo A. Lakka
Publication date
01-04-2017
Publisher
Springer International Publishing
Published in
Sports Medicine / Issue 4/2017
Print ISSN: 0112-1642
Electronic ISSN: 1179-2035
DOI
https://doi.org/10.1007/s40279-016-0606-x

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