While is is well-known that exercise is a necessity for effective weight loss, there is quite a bit of conflicting information as to what kind of exercise and how much of it will produce optimal fat burning. Experts often disagree as to what the “correct” exercise is for maximum weight loss. This disagreement is often due to a misinterpretation of research that only gives a part of the whole story. In addition, different individuals will actually benefit from different exercise programs, so universal exercise recommendations really cannot be made.
Let’s begin with what the current research on exercise physiology tells us. It is well-established that it takes approximately 30 minutes of any kind of exercise for the body to burn off its glycogen (stored sugar) reserves and begin burning fat. So, most experts recommend at least 30 minutes of exercise, and generally 60 minutes or more may be recommended to get a good amount of fat burning. Now, if you are going to be exercising for 30 to 60 minutes, or maybe more, what type of exercise would you be able to do for that length of time? It probably would have to be low to medium intensity. In other words, you’re probably not going to be able to run full speed or do any other type of high-intensity exercise for 30 to 60 minutes without a rest, unless you happen to be an elite athlete, and even then you’d be struggling. So, by default, the common recommendation for exercise to lose weight has been 30 to 60 minutes of low to medium intensity aerobic exercise. Aerobic translates to “in the presence of oxygen”, which in common language means that aerobic exercise is any type of activity that you can do without gasping for breath.
In recent years, some experts have changed their recommendations to using a more intense anaerobic (“without oxygen”) exercise program for weight loss. This would include things like intense weight lifting, and something called “interval training”. Interval training involves brief bursts of high intensity activity with periods of rest or low intensity activity in between. For instance, your could sprint at full speed for 30 to 60 seconds and once you were winded, you could walk at an easy pace for a couple of minutes until you could catch your breath, then repeat the cycle several more times.. Since this type of exercise is much more physically demanding, it is done over a much shorter overall workout period – perhaps 20 to 40 minutes (with half or more of that time being rest or low intensity activity), as compared to the 30 to 60 minutes of continuous activity as recommended for aerobic exercise. The question is, how do the two types of exercise compare in terms of their ability to promote fat burning?
