NASM Personal Trainer

Answer - A - The performance of over an hour of endurance exercise would benefit the most from caffeine. High-intensity short-duration exercises lasting approximately 5 minutes have also been shown to be enhanced by caffeine. The most effective dose for an ergogenic response is about 3 to 6 mg of caffeine per kilogram of bodyweight, which is essentially a 16-ounce cup of black coffee for a 150 pound person.