Key result
Water-based circuit training lowers fasting insulin ~44% in overweight women with impaired glucose tolerance.
Why the study?
Does a 12-week water-based exercise program improve glucose and insulin responses in overweight women?
Does a 12-week water-based exercise program improve glucose and insulin responses in overweight women?
A 12-week water-based exercise program improves glucose and insulin responses in overweight women with impaired glucose tolerance.
May support water-based exercise for glycemic control in overweight women; hypothesis-generating and requires randomized confirmation.
OBJECTIVE: The aim of this study was to investigate the effectiveness of a 12-week moderate intensity, water-based circuit-type training intervention on glucose and insulin responses in overweight women with normal or impaired glucose tolerance. METHODS: Fifteen overweight women (body mass index [BMI] > 25 kg/m(2)) with normal glucose tolerance (NGT; n = 7) or impaired glucose tolerance (IGT; n = 8) were recruited for this study. All women completed a 12-week training intervention utilizing a combination of aerobic and resistance exercises in an aquatic environment, 3 days per week and 60 min per session at 70-75% mode-specific maximum heart rate. A standard 75-g oral glucose tolerance test (OGTT) was administered pre- and post-intervention, from which fasting and post-load plasma insulin and glucose levels were assessed. RESULTS: Following the 12-week period, fasting insulin levels had decreased by 44% and 2-h glucose by 30.4% in the group with IGT. Waist circumference (WC) had decreased by 5.3% in this group at the end of the intervention. Only WC and waist-to-hip ratio (WHR) decreased (6.0% and 5.5%, respectively) following the intervention in the NGT group. CONCLUSIONS: Moderate intensity, water-based circuit-type exercises appear to be an effective exercise modality to improve glucose and insulin response to a glucose challenge in overweight women with IGT.
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Jones et al. (2009) studied Overweight with normal or impaired glucose tolerance (n=15). Moderate intensity, water-based circuit-type training vs. Pre-intervention baseline was evaluated on Fasting and post-load plasma insulin and glucose levels. A 12-week moderate intensity, water-based circuit-type training intervention decreased fasting insulin by 44% and 2-h glucose by 30.4% in overweight women with impaired glucose tolerance.
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