1. While the runners are at a slow and steady pace they are relying on aerobic metabolism. This uses both glucose and fatty acids to produce ATP. The trained runner will have an increased aerobic capacity as a result of their intensive training. They can generate more ATP and store more glycogen. When the pace is quickened, anaerobic metabolism (fueled by glucose) takes over to get the additional ATP that the muscles need. The untrained runner has a lesser amount of glycogen stored and a lesser ability to generate more ATP. Their stored glycogen depletes quicker and they tire faster.
2. Eating an hour before a soccer match will not be enough time for food to digest and absorb. This can result in nausea, cramps, diarrhea, etc... A meal
2. Eating an hour before a soccer match will not be enough time for food to digest and absorb. This can result in nausea, cramps, diarrhea, etc... A meal