Article: Leisure-time physical activity, sedentary behavior, and physical fitness among adolescents: varying definitions yield differing results in fitness research.

A number of relationships involving physical activity and health are well-documented in the literature. Physical inactivity is associated with overweight and weight gain (Tremblay et al., 1990; Williamson et al., 1993) and with relative risk for coronary heart disease, the leading cause of death in North America (Sallis, Patterson, Buono, & Nader, 1988; Sandvik et al., 1993). Obesity among young children and adolescents has increased in the past 20+ years, with the rates of obesity ranging between six and 33 percent (Dietz, 1986; Kerner et al., 2001; Troiano, Flegal, Kuczmarski, Campbell, & Johnson, 1995). Additionally, childhood physical inactivity may exacerbate other ...

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