期刊
SPORTS MEDICINE
卷 47, 期 4, 页码 769-780出版社
ADIS INT LTD
DOI: 10.1007/s40279-016-0606-x
关键词
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资金
- Ministry of Social Affairs and Health of Finland
- Ministry of Education and Culture of Finland
- University of Eastern Finland
- Finnish Innovation Fund Sitra
- Social Insurance Institution of Finland
- Finnish Cultural Foundation
- Juho Vainio Foundation
- Foundation for Paediatric Research
- Paulo Foundation
- Paavo Nurmi Foundation
- Diabetes Research Foundation
- city of Kuopio
- Kuopio University Hospital [5031343]
- Research Committee of the Kuopio University Hospital Catchment Area for the State Research Funding
- UK Medical Research Council [MC_UU_12015/3]
- Wellcome Trust [074296/Z/04/Z]
- British Heart Foundation [Intermediate Basic Science Research Fellowship] [FS/12/58/29709]
- UK Clinical Research Collaboration Public Health Research [RES-590-280002]
- British Heart Foundation [FS/12/58/29709] Funding Source: researchfish
- Medical Research Council [MC_UP_1001/2, MC_U106179473, MC_UU_12015/7, MC_UU_12015/3] Funding Source: researchfish
- MRC [MC_U106179473, MC_UU_12015/3, MC_UU_12015/7, MC_UP_1001/2] Funding Source: UKRI
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 finegrained 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/ m(2)), trunk fat mass index (TFMI, kg/m(2)) and fat-free mass index (FFMI, kg/m(2.5)) 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.
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