From this article in the International Journal of Obesity, High-intensity intermittent exercise attenuates ad-libitum energy intake comes this conclusion: “High-intensity intermittent exercise suppresses subsequent ad-libitum energy intake in overweight inactive men. This format of exercise was found to be well tolerated in an overweight population.” The study compared a group of over-weight men who did moderate exercise to another over-weight group who did high intensity interval exercise (HIIT). Seventy minutes after they exercised the HIT group consumed fewer calories and also consumed fewer calories the next day. That has been my experience as well – at least directly after a workout. On the days I had planned to do a sprint session it is not usual that I am trying to get the session in before I eat. I don’t want to do this type of high intensity training on a full stomach. So it often turns out that just when I was feeling hungry I do my sprint training. It often happens that I don’t feel like eating after exercise, but it is more pronounced after any form of HIIT either sprint training or HIIT strength training. For me that lack appetite lasts hours. At Austin Personal Training and at New Orleans Fitness Trainers we can help you gradually build up to a high intensity strength training or an aerobic high intensity training program that is safe, effective, and efficient for your age and condition. You need not spend hours in the gym to feel better, look better, and perform better.