Vit D Reduces Belly Fat, Increases Muscle Strength
A recent study on overweight and obese adults investigated the impact of vitamin D supplementation during strength training on their body composition, muscle function, and glucose tolerance.
Investigators recruited 23 overweight and obese adults to participate in a double-blind, placebo-controlled trial. The average age of the volunteers was 26 years, with an average body mass index of 31.3 kg/m2. They were randomly divided into two groups, where one group, composed of 5 males and females, was given a daily dose of vitamin D at 4000IU, and another group, composed of 7 females and 6 males, was given a placebo. All participants completed 12weeks of resistance training. Levels of vitamin D, parathyroid hormone, body composition (including waist circumference), and glucose tolerance were assessed at before treatment and after 12weeks. Muscle function in terms of strength and power was evaluated before, and after 4, 8, and 12weeks of training.
Results of the study showed that during the treatment, vitamin D levels increased and parathyroid hormone decreased in the vitamin D group. Peak muscle power was significantly increased at 4weeks in the group receiving vitamin D. The increase in vitamin D levels was associated with a decrease in waist-to-hip ratio by the end of the study. No other changes were observed with supplementation.
Adequate levels of vitamin D are necessary for optimal metabolism and body weight, but the precise mechanisms of its function are still unclear. It must be noted that he dose of vitamin D used in this study is 10 times as much the government recommendation for daily intake (400IU).
It is suggested that insulin resistance occurs in the muscles of overweight and obese individuals, reducing their strength and power to perform well. It appears that vitamin D helps improve muscle function in response to exercise, as well as reduce weight and waist circumference.
Richards, B. Vitamin D Improves Strength While Reducing Abdominal Fat. Wellness Resources.
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