Physical activity patterns and prevention of weight gain in premenopausal women - PubMed (original) (raw)

Physical activity patterns and prevention of weight gain in premenopausal women

R A Mekary et al. Int J Obes (Lond). 2009 Sep.

Abstract

Background: Studies of the association between physical activity (PA) and weight maintenance have been inconsistent.

Methods: We prospectively examined the association between PA patterns and prevention of weight gain among 46 754 healthy premenopausal women, aged 25-43 years in 1989. Participants reported their PA and weight in 1989 and 1997. The primary outcome was gaining >5% of baseline weight by 1997 (62% of the population).

Results: Compared with women who maintained <30 min d(-1) of total discretionary activity over 8 years, women were less likely to gain weight if they sustained 30+ min d(-1) (odds ratio (OR)=0.68, 95% confidence interval (CI) 0.64-0.73) or increased to 30+ min d(-1) in 1997 (OR=0.64, 95%CI=0.60-0.68). Among women whose only reported activity was walking, risk of gaining weight was lower in those who sustained 30+ min d(-1) over 8 years (OR=0.66, 95%CI=0.49-0.91), and brisk walking pace independently predicted less weight gain. For a 30 min d(-1) increase between 1989 and 1997, jogging/running was associated with less weight gain than brisk walking or other activities. Greater duration of PA was associated with progressively less weight gain, but even an 11-20 min d(-1) increase was beneficial; the benefits appeared stronger among those who were initially overweight. Sedentary behavior independently predicted weight gain.

Conclusions: Sustained PA for at least 30 min d(-1), particularly if more intense, is associated with a reduction in long-term weight gain, and greater duration is associated with less weight gain. Sedentary women of any baseline weight who increase their PA will benefit, but overweight women appear to benefit the most.

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Figures

Figure 1

Figure 1

Figures 1A–B–C. The reference category (Ref) reflects women who were initially low in physical activity in 1989 and who remained in this low category in 1997.

Figure 2

Figure 2. Association of 8-year change in total discretionary activity with 8-year weight change, stratified by 3 levels of 1989 BMI

Figure 2A includes only women who were initially low in physical activity (<10 min/d) at baseline (1989), (n=11,353). The figure reflects the slope of weight change if women remained in the low physical activity category in 1997 (reference), or if they increased their activity in 1997 to 11–20 min/d or more, for each BMI category Figure 2B includes only women who were initially high in physical activity (61+ min/d) at baseline (1989), (n=8,831). The figure reflects the slope of weight change if women remained in the high physical activity category in 1997 (reference), or if they decreased their activity in 1997 to 31–60 min/d or less, for each BMI category.

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