William F Riner

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PURPOSE The purpose of this study was to evaluate the validity of the CSA activity monitor as a measure of children's physical activity using energy expenditure (EE) as a criterion measure. METHODS Thirty subjects aged 10 to 14 performed three 5-min treadmill bouts at 3, 4, and 6 mph, respectively. While on the treadmill, subjects wore CSA (WAM 7164)(More)
OBJECTIVE The purpose of this study was to identify the psychosocial and environmental correlates of objectively measured physical activity behavior in a diverse sample of sixth-grade students. DESIGN Cross-sectional. PARTICIPANTS AND SETTINGS One hundred ninety-eight sixth-grade students from 4 public middle schools in Columbia, South Carolina. The(More)
PURPOSE This study was conducted to determine if fifth-grade students who walked or bicycled to school on a regular basis were more physically active than those that did not. METHODS The sample consists of 219 fifth-grade students (10.3 +/- 0.6 yr, 44% male, 58% minority) from eight randomly selected urban and suburban elementary schools. Students wore an(More)
Young adults are often in periods of transition, and lifestyle changes such as a decline in physical activity can occur during this period. The purpose of this study was to determine the relationships between demographic, biologic, lifestyle, social support index, environmental factors, and physical activity in young adults. The participants were 4,152(More)
The present study tested the hypothesis that TV viewing habits and overweight would be associated among 4-year-old children. A convenience sample of Head Start students was enrolled (N=148). Parents were asked to complete a questionnaire on their children's TV viewing habits for a typical weekday, and for Saturday and Sunday. Height and weight of the(More)
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(More)
The purpose of this study was to compare the physiological responses of highly trained middle (MD) and long distance (LD) runners during treadmill running. The oxygen uptake (VO2) of 74 elite runners (42 MD and 32 LD) was measured during treadmill running at several speeds (201, 241, 282, and 322 m/min at 0% grade) and at maximal effort. The mean VO2max(More)
OBJECTIVE To assess the association between vigorous physical activity, participation on sport teams and in exercise programs, television watching, family environment, and weight status in youth. DESIGN Cross-sectional data from the Third National Health and Nutrition Examination Survey. PARTICIPANTS A group of 2791 youth between the ages of 8 and 16(More)
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