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Open AccessArticle

Physical Activity Level Using Doubly-Labeled Water in Relation to Body Composition and Physical Fitness in Preschoolers

1
Faculty of Sport and Health Sciences, University of Jyvaskyla, FI-40014 Jyvaskyla, Finland
2
Department of Biosciences and Nutrition, Karolinska Institutet, SE-141 83 Huddinge, Sweden
3
Department of Medical and Health Sciences, Linköping University, 581 83 Linköping, Sweden
4
Healthy Active Living and Obesity (HALO) Research Group, Children’s Hospital of Eastern Ontario Research Institute, Ottawa, ON K1H 8L1, Canada
5
Department of Physical Education and Sport, Faculty of Education, University of Sevilla c/ Pirotecnia, s/n, 41013 Sevilla, Spain
6
Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC), University of Cordoba, CIBERObn, Avda Menéndez Pidal s/n, 14004 Cordoba, Spain
*
Author to whom correspondence should be addressed.
Medicina 2019, 55(1), 2; https://doi.org/10.3390/medicina55010002
Received: 14 November 2018 / Revised: 9 December 2018 / Accepted: 20 December 2018 / Published: 27 December 2018
Background and objectives: There is a lack of studies investigating associations of physical activity level (PAL) and activity energy expenditure (AEE) using the doubly-labeled water (DLW) method with body composition and physical fitness in young children. Thus, we aimed to examine cross-sectional associations of PAL and AEE with body composition indices and physical fitness components in Swedish preschool children. Materials and methods: PAL was calculated as total energy expenditure measured using DLW divided by the predicted basal metabolic rate in 40 children aged 5.5 (standard deviation 0.2) years. AEE was calculated as total energy expenditure minus basal metabolic rate and the thermic effect of food, and divided by fat-free mass. Body composition was assessed using the 3-component model by combining measurements based on isotope dilution and air-displacement plethysmography. Physical fitness (muscular strength, motor fitness, and cardiorespiratory fitness) was evaluated using the PREFIT test battery. Multiple linear regression models were conducted. Results: PAL and AEE were negatively associated with body mass index, percent body fat, and fat mass index (PAL: standardized β −0.35, −0.41, and −0.45, all p < 0.036; AEE: standardized β −0.44, −0.44, and −0.47, all p < 0.006, respectively). Furthermore, PAL and AEE were positively associated with the standing long jump test (PAL: standardized β 0.37, p = 0.017; AEE: standardized β 0.38, p = 0.014). There were no statistically significant associations found regarding PAL or AEE with fat-free mass index or any other physical fitness test. Conclusions: Greater PAL and AEE at the age 5.5 were significantly associated with body fatness and improved lower-body muscular strength. Therefore, increasing physical activity, and thus energy expenditure, at young ages may be beneficial for preventing overweight/obesity. However, further studies with larger sample sizes are needed to confirm the results. View Full-Text
Keywords: energy expenditure; obesity; cardiorespiratory fitness; muscular strength; children energy expenditure; obesity; cardiorespiratory fitness; muscular strength; children
MDPI and ACS Style

Leppänen, M.H.; Henriksson, P.; Henriksson, H.; Delisle Nyström, C.; Llorente-Cantarero, F.J.; Löf, M. Physical Activity Level Using Doubly-Labeled Water in Relation to Body Composition and Physical Fitness in Preschoolers. Medicina 2019, 55, 2.

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