During brief high-intensity exercise, your muscles rely on their glycogen stores and to a lesser extent blood glucose, but relatively little fat. Shorter, intense activities such as sprinting or power lifting are mostly anaerobic activities that cause your muscles to rapidly use high-energy phosphate compounds (ATP and more), and, if they last longer
During physical activity, how much energy your muscles expend increases substantially, supported by fuels like glucose and fats in your bloodstream, as well as glycogen and triglycerides stored within your muscles. The intensity and duration of any exercise are
A study released the first week of February 2008 hit the media headlines hard. “Diabetes Study Partially Halted After Deaths” was the title of the version I read in the NY Times. The introductory paragraph was quite shocking: “For decades, researchers believed that if people with diabetes lowered their blood sugar to normal levels, they [...]