Isotemporal substitution paradigm for physical activity epidemiology and weight change.

Authors:
Rania A Mekary
Rania A Mekary
MCPHS University
Boston | United States
Walter C Willett
Walter C Willett
Harvard T.H. Chan School of Public Health
Boston | United States
Frank B Hu
Frank B Hu
Harvard T.H. Chan School of Public Health
United States
Eric L Ding
Eric L Ding
Harvard School of Public Health
Boston | United States

Am J Epidemiol 2009 Aug 7;170(4):519-27. Epub 2009 Jul 7.

Department of Nutrition, Harvard School of Public Health, Boston, Massachusetts 02115-1204, USA.

For a fixed amount of time engaged in physical activity, activity choice may affect body weight differently depending partly on other activities' displacement. Typical models used to evaluate effects of physical activity on body weight do not directly address these substitutions. An isotemporal substitution paradigm was developed as a new analytic model to study the time-substitution effects of one activity for another. In 1991-1997, the authors longitudinally examined the associations of discretionary physical activities, with varying activity displacements, with 6-year weight loss maintenance among 4,558 healthy, premenopausal US women who had previously lost >5% of their weight. Results of isotemporal substitution models indicated widely heterogeneous relations with each physical activity type (P < 0.001) depending on the displaced activities. Notably, whereas 30 minutes/day of brisk walking substituted for 30 minutes/day of jogging/running was associated with weight increase (1.57 kg, 95% confidence interval: 0.33, 2.82), brisk walking was associated with lower weight when substituted for slow walking (-1.14 kg, 95% confidence interval: -1.75, -0.53) and with even lower weight when substituted for TV watching. Similar heterogeneous relations with weight change were found for each activity type (TV watching, slow walking, brisk walking, jogging/running) when displaced by other activities across these various models. The isotemporal substitution paradigm may offer new insights for future public health recommendations.

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http://dx.doi.org/10.1093/aje/kwp163DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2733862PMC

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August 2009
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References

(Supplied by CrossRef)
Article in American Journal of Clinical Nutrition
Kayman et al.
American Journal of Clinical Nutrition 1990
Article in International journal of obesity
Holden et al.
International journal of obesity 1992
Article in American Journal of Clinical Nutrition
Klem et al.
American Journal of Clinical Nutrition 1997
Article in American Journal of Clinical Nutrition
Schoeller et al.
American Journal of Clinical Nutrition 1997
Article in International journal of obesity
Field et al.
International journal of obesity 2001
Article in International journal of obesity
Sarlio-L  hteenkorva et al.
International journal of obesity 2000
Article in Journal of consulting and clinical psychology
McGuire et al.
Journal of consulting and clinical psychology 1999
Article in American Journal of Epidemiology
WILLETT et al.
American Journal of Epidemiology 1986
Article in American Journal of Clinical Nutrition
American Journal of Clinical Nutrition 1997
Article in International Journal of Epidemiology
WOLF et al.
International Journal of Epidemiology 1994
Article in JAMA
Hu et al.
JAMA 2003

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