There are several reasons why the coffee drink before training can increase weight loss. Caffeine is in a cup of coffee accelerate metabolism, providing a temporal energy increase may give as result harder training, and therefore, contribute to weight loss. But there are other factors to consider.
According to a study cited by the Australian Institute of Sport, caffeine can cause your muscles to use fat as an energy source instead of using sugars from carbohydrates, although this effect is short and inconsistent in some people. It is also believed that caffeine improves athletic performance during activities strengthening body enhancing skills to achieve additional energy fat reserves during an event. The cafe also has a diuretic effect that helps weight loss after exercise. But MayoClinic.com says that although caffeine may provide a slight weight loss or prevent weight gain, there is no evidence that increasing caffeine consumption can produce significant weight loss or permanent.
The International Olympic Committee considers that caffeine is an ergogenic aid to improve performance, and has limited athletes consumption to no more than 1,200 mg of caffeine before competition, the equivalent of 6 to 8 cups of coffee. A study by the University of Hiroshima in Japan, published in The American Journal of Cardiology, concluded that caffeine can also increase nitric oxide levels in the blood, giving as a result an increase in blood flow in the muscles. This can result in longer workouts and background that can cause an increase in weight loss.
A 2005 report published in Scandinavian Journal of Medicine & Science in Sports found that drinking coffee or any beverage that contains caffeine improves exercise performance by over 11%. Regression analysis found that the RPE, a subjective measure of exercise intensity levels used in private investigation, achieved during exercise may be a 29% of the variation in any improvement in exercise performance. According to this study, the results demonstrated that caffeine reduced RPE during exercise, providing a partial explanation for the ergogenic effects that caffeine has on exercise performance.
Restricted blood flow
But some studies suggest that drinking coffee before exercise can be bad for training, and thus prevent weight loss. According to a study published issue of the Journal of the American College of Cardiology , the equivalent of two cups of coffee reduces the body’s ability to increase blood flow to the heart during exercise. “When we exercise, myocardial blood flow must increase to fit the increased oxygen requirement,” wrote researcher Dr. Phillipp A. Kaufmann. “We found that caffeine affects this mechanism negatively. Partially reduces the need for increased flow.”