What is Interval Training?

The term "interval training" has become quiet the buzz word over the past year. So what is it and how does it work? First off, interval training is not a new technique for athletic performance improvement. Athletes have made interval training a part of their training for many years. Fartlek training is a good example of a training technique based on the same principles. Interval training is simply combining periods of high intesity exercise with low intensity exercise. You can apply interval training no matter what your level of fitness.

Many studies indicate that the use of interval training with "untrained" individuals is more effective at decreasing a person body fat than long slow distance training like most people are used to doing. They also got in shape faster. Here is a personal example. Several years ago I was looking to supplement my income a little and decided that I would deliver newspapers in the early morning. Well, instead of driving my car to each individual house, getting out. letting the engine run, and move on, I decided I would park my car, grab as many papers as I could carry and run from one house to the next. I would then get in the car and drive to the next area. This short duration, high intensity exercise with rest in between is what interval training is all about. Within 3 or 4 weeks I noticed that my pants were a little loose and I wasn't quiete as out of breath coming back to the car.

So how does it work? Think of your body as having 3 different types of fuel, or energy systems, to use. I will use the metaphor of starting a fire to help illustrate. The first fuel is easily ignited and burns really quickly (think of a match). The second fuel takes a little more effort to get it going but will burn for a little longer than the first (think of the kindling). The third energy system takes quiete a bit of effort to get started and burns really slow and long (think of the oak log). Each of these systems has fancy scientific names attached to them. Maybe in another blog I will go into further detail.

When you are doing interval training you are burning matches like crazy and some of the kindling, depending on how long your exercise bout is. During your recovery period, which could last up to 3x the length of your exercise bout, your body uses energy from the oak log to rebuild your matches. The oak log uses fat for energy and to replace the energy used during the match phase and the kindling phase.

By using high intensity interval training you are training your body to use fat to replenish your emergency fuel sources.