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Excerpt — Physical Activity Epidemiology-2nd Edition

Physical activity and breast cancer: the evidence

Approximately three-quarters of these studies classified women according to three or more levels of physical activity, allowing assessment of a dose–response relation (Lee and Oguma 2006).

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Inferring cause in epidemiologic studies

The epidemiologic models previously described provide a framework for considering the association among variables in an attempt to determine cause and effect.

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Etiology of overweight and obesity: set point or settling point?

Weight gain resulting from excess storage of fat is ultimately explained by an intake of calories that exceeds those expended.

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Individual barriers to physical activity influence behavior

Costs and barriers associated with a behavior have been recognized as important influences on that behavior since theories about how people make decisions began to proliferate in the 1950s (Janis and Mann 1977).

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