OBJECTIVE: To study the effect of physical activity on whole body fat (BF), its regional deposition and the influence of body fatness on physical performance in prepubertal children. DESIGN: Cross-sectional study. SUBJECTS: A total of 114 boys (9.4+/-1.5 y, Tanner I-II), randomly sampled from the population of Gran Canaria (Spain), 63 of them physically active (PA, at least 3 h per week during the previous year) and 51 nonphysically active (non-PA). MEASUREMENTS: Body composition (DXA), anthropometric variables (body circumferences and skinfolds) and physical fitness were determined in all subjects. RESULTS: The PA obtained better results in maximal oxygen uptake, isometric leg extension force, vertical jump (muscular power), and 300 m (anaerobic capacity) and 30 m running tests (speed) than the non-PA. A lower percentage of body fat (% BF) (4 U less, P<0.05), whole BF mass (36% less, P<0.05) and regional fat mass (28, 25, and 30% less in the trunk, legs and arms, respectively, all P<0.05) was observed in the PA compared to the non-PA. The waist and hip circumferences correlated more closely with both the fat mass accumulated in the trunk region and the % BF (r=0.81-0.95, P<0.001) than the waist-to-hip ratio (WHR). The WHR correlated with the percentage of the whole fat mass accumulated in the trunk (PFT) (r=0.52-0.53, P<0.001). In both groups, the PFT increased curvilinearly with the % BF, regardless of the level of physical activity. ANCOVA analysis revealed that total and regional fat masses explained less than 40% of the difference in performance between the PA and non-PA group. The mean speed in the 30 m running test (V30), combined with the height and whole body mass, has predictive value for the BF mass (R=0.98, P<0.001). The % BF may be estimated from the body mass index (BMI) and V30 (% BF=8.09+2.44.BMI (kg m(-2))-5.8.V30 (m s(-1)), R=0.94, P<0.001) in prepubertal boys. CONCLUSIONS: Regular participation in at least 3 h per week of sports activities and competitions on top of the compulsory physical education program is associated with increased physical fitness, lower whole body and trunkal fat mass in prepubertal boys.
OBJECTIVE: To study the effect of physical activity on whole body fat (BF), its regional deposition and the influence of body fatness on physical performance in prepubertal children. DESIGN: Cross-sectional study. SUBJECTS: A total of 114 boys (9.4+/-1.5 y, Tanner I-II), randomly sampled from the population of Gran Canaria (Spain), 63 of them physically active (PA, at least 3 h per week during the previous year) and 51 nonphysically active (non-PA). MEASUREMENTS: Body composition (DXA), anthropometric variables (body circumferences and skinfolds) and physical fitness were determined in all subjects. RESULTS: The PA obtained better results in maximal oxygen uptake, isometric leg extension force, vertical jump (muscular power), and 300 m (anaerobic capacity) and 30 m running tests (speed) than the non-PA. A lower percentage of body fat (% BF) (4 U less, P<0.05), whole BF mass (36% less, P<0.05) and regional fat mass (28, 25, and 30% less in the trunk, legs and arms, respectively, all P<0.05) was observed in the PA compared to the non-PA. The waist and hip circumferences correlated more closely with both the fat mass accumulated in the trunk region and the % BF (r=0.81-0.95, P<0.001) than the waist-to-hip ratio (WHR). The WHR correlated with the percentage of the whole fat mass accumulated in the trunk (PFT) (r=0.52-0.53, P<0.001). In both groups, the PFT increased curvilinearly with the % BF, regardless of the level of physical activity. ANCOVA analysis revealed that total and regional fat masses explained less than 40% of the difference in performance between the PA and non-PA group. The mean speed in the 30 m running test (V30), combined with the height and whole body mass, has predictive value for the BF mass (R=0.98, P<0.001). The % BF may be estimated from the body mass index (BMI) and V30 (% BF=8.09+2.44.BMI (kg m(-2))-5.8.V30 (m s(-1)), R=0.94, P<0.001) in prepubertal boys. CONCLUSIONS: Regular participation in at least 3 h per week of sports activities and competitions on top of the compulsory physical education program is associated with increased physical fitness, lower whole body and trunkal fat mass in prepubertal boys.
Authors: Diego Moliner-Urdiales; Francisco B Ortega; Germán Vicente-Rodriguez; Juan P Rey-Lopez; Luis Gracia-Marco; Kurt Widhalm; Michael Sjöström; Luis A Moreno; Manuel J Castillo; Jonatan R Ruiz Journal: Eur J Appl Physiol Date: 2010-04-07 Impact factor: 3.078
Authors: José A L Calbet; Jorge Perez-Gomez; German Vicente-Rodriguez; Ignacio Ara; Hugo Olmedillas; Javier Chavarren; Juan José González-Henriquez; Cecilia Dorado Journal: Eur J Appl Physiol Date: 2008-07-08 Impact factor: 3.078
Authors: Rômulo A Fernandes; Felipe F Reichert; Henrique Luiz Monteiro; Ismael F Freitas Júnior; Jefferson R Cardoso; Enio Ricardo V Ronque; Arli R de Oliveira Journal: Int J Public Health Date: 2010-11-03 Impact factor: 3.380
Authors: Jordan J Smith; Narelle Eather; Philip J Morgan; Ronald C Plotnikoff; Avery D Faigenbaum; David R Lubans Journal: Sports Med Date: 2014-09 Impact factor: 11.136
Authors: José A Serrano-Sánchez; Safira Delgado-Guerra; Hugo Olmedillas; Amelia Guadalupe-Grau; Rafael Arteaga-Ortiz; Joaquín Sanchis-Moysi; Cecilia Dorado; José A L Calbet Journal: PLoS One Date: 2010-10-18 Impact factor: 3.240