0801586a - International Journal of Obesity (2001) 25,...

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PAPER Determining the amount of physical activity needed for long-term weight control LT Wier 1 *, GW Ayers 1 , AS Jackson 2 , AC Rossum 3 , WS Carlos Poston 4 and JP Foreyt 5 1 Health-Related Fitness, NASA = Johnson Space Center, Houston, Texas, USA; 2 Department of Health and Human Performance, University of Houston, Houston, Texas, USA; 3 Kelsey Seybold Clinic, NASA = Johnson Space Center, Houston, Texas, USA; 4 University of Missouri at Kansas City, Kansas City, Missouri, USA; and 5 Behavioral Medicine Research Center, Baylor College of Medicine, Houston, Texas, USA OBJECTIVE : To evaluate prospectively the influence of habitual physical activity on body weight of men and women and to develop a model that defines the role of physical activity on longitudinal weight change. DESIGN AND SETTING : Occupational cohort study conducted for a mean of 5.5 y. SUBJECTS : A total of 496 (341 male and 155 female) NASA = Johnson Space Center employees who completed the 3 month education component of the employee health-related fitness program and remained involved for a minimum of 2 y. MEASUREMENTS : Body weights were measured at baseline (T1) and follow-up (T2), and habitual physical activity was obtained from the mean of multiple ratings of the 11-point (0 – 10) NASA Activity Scale (NAS) recorded quarterly between T1 and T2. Other measures included age, gender, VO 2 max obtained from maximal treadmill testing, body mass index (BMI), and body fat percentage. RESULTS : Multiple regression demonstrated that mean NAS, T1 weight, aging and gender all influence long-term T2 weight. T1 age was significant for the men only. Independently, each increase in mean NAS significantly ( P < 0.01) reduced T2 weight in men ( b ± 7 0.91 kg; 95% CI : 7 1.4 to 7 0.42 kg) and women ( ± 7 2.14 kg; 95% CI : 7 2.93 to 7 1.35 kg). Mean NAS had a greater effect on T2 weight as T1 weight increased, and the relationship was dose-dependent. CONCLUSIONS : Habitual physical activity is a significant source of long-term weight change. The use of self-reported activity level is helpful in predicting long-term weight changes and may be used by health care professionals when counseling patients about the value of physical activity for weight control. International Journal of Obesity (2001) 25, 613 – 621 Keywords: weight control; body weight; physical activity; aging; gender Introduction Adult Americans tend to gain weight 1 and become increas- ingly overweight as they age. 2 While gaining a slight amount of weight with increasing age has been associated with a longer life-span, 3 large weight gains elevate the risks for disease and shorten life expectancy. 4 When the body weight rises from normal to increasingly severe obesity, there is a parallel rise in the rate and relative incidence of serious medical conditions 5 and mortality.
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This note was uploaded on 03/02/2012 for the course XV 123 taught by Professor Fwsf during the Spring '12 term at St. Johns Duplicate.

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0801586a - International Journal of Obesity (2001) 25,...

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