Although, all of the information that is presented in this article is geared toward the benefits and/or effectiveness of anaerobic high intensity interval training (HIIT) vs. low intensity aerobic training with regards to fat utilization, there is an understanding that some reasons for aerobic training supersede the outcomes. For the sake of pure enjoyment, personal goal setting (training for a triathlon, marathon, road race, etc), and the challenge of competition are all viable and respectable reasons for interacting with long slow distance (LSD) activities. For many people these types of activities are suitable for their lifestyle and enjoyable means of living an active life. The goal of this article is not to discount or diminish the value of physical activity in all its modalities, but to merely present data with regards to optimum fat loss, hormonal indicators, and other factors of cardiovascular and cardio respiratory markers as they pertain to exercise intensity prescription.
In the world of endurance, it seems that you cannot discuss fitness without discussing VO2 max. Ask any endurance athlete about it, and you will hear epic stories with names like Indurain, and LeMond. Many of you, however, may find yourselves wondering what exactly VO2 max is and why is it so important. To better understand this concept; let’s take a little trip back to school, specifically back to physiology class. According to the Essentials of Strength Training and Conditioning textbook, VO2 max is the maximum amount of oxygen in millilitres one can use in one minute per kilogram of body weight (ml/kg/min). In other words, maximal oxygen uptake (VO2 max) is the greatest amount of oxygen that can be used at the cellular level for the entire body. VO2 max has been found to correlate well with an individual’s degree of physical conditioning and has been accepted as an index of total body fitness. Numerous studies show that one can increase his/her VO2 max by working out at an intensity that raises the heart rate to between 65 and 85 percent of its maximum, for at least 20 minutes, three to five times per week. The estimated mean value of VO2 max for male athletes is about 3.5 liters/minute and for female athletes is about 2.7 liters/minute.