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Int J Environ Res Public Health. 2011 Sep;8(9):3747-58. doi: 10.3390/ijerph8093747. Epub 2011 Sep 19.

Sitting time and Body Mass Index in diabetics and pre-diabetics willing to participate in a lifestyle intervention.

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Department of Health Promotion, Maastricht University, School for Nutrition, Toxicology and Metabolism (NUTRIM), 6211 LK, The Netherlands.


This cross-sectional study examined the relationship between Body Mass Index (BMI), total sitting time and total physical activity time in a generally overweight or obese population of type 2 diabetics or pre-diabetics willing to participate in a lifestyle intervention [n = 221, 55.1% male, mean age (SD) 62.0 (9.9), mean BMI (SD) 31.4 (5.0)]. In addition, we aimed to identify demographic and psychosocial associates of the motivation to become more physically active. The measurement instrument was a self-report questionnaire. Results showed that total sitting time was more closely related to BMI than total physical activity time. Subjects with a higher weight status were more sedentary, but they were also more motivated to be physically active. On the other hand, their self-efficacy to be physically active was lower than subjects with a lower weight status. Lifestyle interventions to decrease the risk of obesity and type 2 diabetes should aim not only at increasing total physical activity time, but also at reducing the total sitting time. Despite generally high levels of motivation among these obese participants, intervention designers and intermediaries should be aware of their low level of self-efficacy towards being physically active.


Body Mass Index; lifestyle intervention; motivation to be physically active; physical activity; sitting time; type 2 diabetes

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