If you're one of those people who never does anything half-way, you've no doubt discovered High Intensity Interval Training (HIIT). It's ideal for those who want to accomplish a lot in a relatively short period of time. A study published in the International Journal of Sport Nutrition and Exercise Metabolism suggests a supplementation strategy for improving time to exhaustion during back-to-back sessions.
Six male volunteers who performed glycogen-depleting HIIT were given either a 15% carbohydrate solution prepared as 1.2 grams per kg of body weight or a caffeine + carbs solution that included 8 mg of caffeine per kg of body weight. They enjoyed this performance beverage 1, 2 and 3 hours after exercise. At 4 hours after their original HIIT session, subjects exercised to exhaustion again. The caffeinated version improved performance more than carbohydrates alone. To see how many calories might be burned after an intense exercise session like this, check today's Breaking News post at Optimumnutrition.com