Purpose To examine the levels of PA in children and adolescents in relation to published recommendations. Methods total of 439 nine-year-olds (202 boys and 237 girls) and 364 fifteen-year-olds (156 boys and 208 girls) agreed to participate. Amount of PA was measured during four consecutive days (two weekdays and two weekend days) with an activity monitor (...
Background Atherosclerosis develops from early childhood; physical activity could positively affect this process. This study’s aim was to assess the associations of objectively measured physical activity with clustering of cardiovascular disease risk factors in children and derive guidelines on the basis of this analysis. Methods We did a cross-sectional ...
Background Changes in sedentary behavior may be related to changes in energy intake. Objective The purpose of this study was to investigate how experimental changes in the amount of sedentary behaviors influence energy intake. Design Sixteen non-overweight 12—16-yr-old youth were studied in a within-subject crossover design with three 3-wk phases: ...
The purpose of this study was to investigate the influence of physical activity on radius and tibia quantitative ultrasound measurements in peripubertal girls. Methods Participants were 174 peri-pubertal girls ages 9.2 to 13.1 yrs, divided into three groups according Tanner stage of puberty, namely, group II (age: 10.8+/-0.9 yrs; bone age: 10.5+/-1.1 yrs; ...
This study examines energy expenditure and physical activity levels for a sample of 40 adolescent girls of the Sereer ethnic group of rural Senegal. The girls were 13.3 +/- 0.5 years at the start of the study (June 1997) and were followed annually for the next 2 years during puberty. Data collected during each round ...
Purpose To evaluate the differences between Caucasians and non-Caucasians with regard to cardiorespiratory fitness, physical activity and obesity measures. Methods Four hundred and ten 9-year old children and 347 15-year old youths participated in a cross-sectional study as a part of the European Youth Heart Study. The non-Caucasians constituted 17% of the ...
Objective To describe the levels of physical activity and energy intake in a sample of Bolivian Adolescents. Setting La Paz, September-October 2004. Methodology: 45 secondary school students (19 males; 26 females; mean age 15.6 SD 1.25) wear accelerometers (Actigraph-7164; http://www.theactigraph.com) during three days. Anthropometric measurements were registered. A semi-quantitative food frequency-questionnaire was used ...
This study compared the determinants of physical activity in active and low-active African-American sixth grade students (N = 108, 57 F, 51 M). Objective assessments of physical activity over a seven-day period were obtained using the CSA 7164 accelerometer. Students were classified as active if they exhibited three or more 20-minute bouts of moderate to ...
Objective To evaluate the theory of reasoned action (TRA) and planned behavior (TPB) In predicting moderate-to-vigorous physical activity (MVPA) in sixth-grade youth. Methods One hundred ninety-eight students completed a questionnaire measuring attitudes, subjective norms, perceived behavioral control, and intentions to be active. MVPA was measured using the CSA 7,164 accelerometer. Results ...
Purpose To derive a regression equation that estimates metabolic equivalent (MET) from accelerometer counts, and to define thresholds of accelerometer counts that can be used to delineate sedentary, light, moderate, and vigorous activity in adolescent girls. Methods Seventy-four healthy 8th grade girls, age 13-14 yr, were recruited from urban areas ...