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The Effect of Exercise on Glucose ControlWhat is the problem and what is known about it so far?A bout of exercise can influence the body’s ability to handle glucose and insulin. Some have suggested that exercising on an empty stomach may be more beneficial than exercising after a meal, with effects that may last for later meals. But little is known about when exercise may be most beneficial, and how it affects people with different health issues. Why did the researchers do this particular study?The researchers wanted to compare the effects of exercise before and after meals on the ability to control glucose and insulin in people with metabolic syndrome — a cluster of symptoms including high blood pressure, a large waist size, high levels of fats in the blood, and poor glucose control. Who was studied?The study included seven sedentary males with metabolic syndrome. How was the study done?Each participant tried three patterns of exercise: before meals, after meals, and no exercise. The meals were standardized, so every participant ate the same amount and type of food. Blood was drawn to measure levels of glucose and insulin. What did the researchers find?Exercising on an empty stomach tended to use energy from fat, while exercising after the meal tended to reduce the rise of glucose after a meal. While both are beneficial effects, neither persisted for meals later in the day. What were the limitations of the study?The number of participants was small, and only included males. A larger study with a more diverse group of participants may reach different results. What are the implications of the study?Exercise is healthful, but the effects do not last all day. More study is needed to assess the timing of exercise and meals.
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