Energy Sports Drinks
By Gene Bruno, MS, MHS – Dean of Academics, Huntington College of Health Sciences
The longer an event lasts, the greater impact nutritional factors have on performance. In events lasting less than an hour, there is little need to consume extra fluid, electrolytes or calories during the physical activity. However, in longer events, problems such as glycogen depletion and hydration can occur.1
Glycogen depletion
When liver and muscle stores of glycogen are depleted, any demanding physical activity comes to a halt. This is primarily due to a lack of readily available calories necessary to maintain blood sugar levels. As blood sugar levels drop, fatigue sets in. Low blood sugar is not immediately life threatening like dehydration but it does slow down performance.2 Carbohydrate loading in the days prior to the event will help store extra glycogen, but in long term events this must also be supplemented with some immediate form of calories 2-4 hours before exercise.3