Objective To study the relation between sleep habits, nutritional status, growth and maturation in a group of African adolescent girls. The main hypothesis to be tested was that sleep length could be an effective way to spare energy, and thus malnourished girls sleep longer than normal girls. Design Three repeated ...
Objective To examine the relationship between pubertal timing and physical activity. Study Design A longitudinal sample of 143 adolescent girls was assessed at ages 11 and 13 years. Girls' pubertal development was assessed at age 11 with blood estradiol levels, Tanner breast staging criteria, and parental report of pubertal development. Girls were classified as ...
Objective To examine how travel by walking before and after school contributes to total physical activity of adolescent girls. Design Cross-sectional sample. Setting 36 middle schools from Arizona, Maryland, Minnesota, New Orleans, San Diego and South Carolina participating in the Trial of Activity for Adolescent Girls (TAAG). Participants—1721 6th grade girls ...
Self-report measures remain the most popular tool for measuring the habitual physical activity of large samples of children The Multimedia Activity Recall for Children and Adolescents (MARCA) is a computer delivered questionnaire which requires children to recall the previous 24-h in 5 min segments The MARCA retains the key features of ...
We examined the ability of the Computer Science Applications (CSA) accelerometer to predict energy expenditure during treadmill walking and stair stepping in nine children and adolescents with cystic fibrosis (CF) (mean age 12.1 yr, SD + 2.8) and ten healthy controls (mean age 10.8 yr. SD + 2.2). The accelerometer was attached above the hip and ...
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 ...