The inverse relationship between number of steps per day and obesity in a population-based sample - the AusDiab study

Dwyer, T., Hosmer, D., Hosmer, T., Venn, A. J., Blizzard, C. L., Blair, S. N., Granger, R. H., Shaw, J. E., Zimmet, P. Z., Cochrane, J. A. and Dunstan, D. W. 2007, The inverse relationship between number of steps per day and obesity in a population-based sample - the AusDiab study, International journal of obesity, vol. 31, no. 5, pp. 797-804.

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Title The inverse relationship between number of steps per day and obesity in a population-based sample - the AusDiab study
Author(s) Dwyer, T.
Hosmer, D.
Hosmer, T.
Venn, A. J.
Blizzard, C. L.
Blair, S. N.
Granger, R. H.
Shaw, J. E.
Zimmet, P. Z.
Cochrane, J. A.
Dunstan, D. W.
Journal name International journal of obesity
Volume number 31
Issue number 5
Start page 797
End page 804
Publisher Macmillan Press
Place of publication Hampshire, England
Publication date 2007
ISSN 0307-0565
1476-5497
Keyword(s) physical activity
pedometer
body mass index
waist circumference
Summary Background:
Physical activity (PA) is inversely associated with obesity but the effect has been difficult to quantify using questionnaires. In particular, the shape of the association has not yet been well described. Pedometers provide an opportunity to better characterize the association.

Methods:
Residents of households over the age of 25 years in randomly selected census districts in Tasmania were eligible to participate in the AusDiab cross-sectional survey conducted in 1999–2000. 1848 completed the AusDiab survey and 1126 of these (609 women and 517 men) wore a pedometer for 2-weekdays. Questionnaire data on recent PA, TV time and other factors were obtained. The outcomes were waist circumference (in cm) and body mass index (BMI) (kg/m2).

Results:
Increasing daily steps were associated with a decline in the obesity measures. The logarithmic nature of the associations was indicated by a sharper decline for those with lower daily steps. For example, an additional 2000 steps for those taking only 2000 steps per day was associated with a reduction of 2.8 (95% confidence interval (CI): 2.1,4.4) cm in waist circumference among men (for women; 2.2 (95% CI: 0.6, 3.9 cm)) with a baseline of only 2000, steps compared to a 0.7 (95% CI 0.3, 1.1) cm reduction (for women; 0.6 (95% CI: 0.2, 1.0)) for those already walking 10 000 steps daily. In the multivariable analysis, clearer associations were detected for PA and these obesity measures using daily step number rather than PA time by questionnaire.

Interpretation:
Pedometer measures of activity indicate that the inverse association between recent PA and obesity is logarithmic in form with the greatest impact for a given arithmetic step number increase seen at lower levels of baseline activity. The findings from this study need to be examined in prospective settings.
Language eng
Field of Research 111199 Nutrition and Dietetics not elsewhere classified
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2007, Nature Publishing Group
Persistent URL http://hdl.handle.net/10536/DRO/DU:30020827

Document type: Journal Article
Collection: School of Exercise and Nutrition Sciences
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