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The VO2 Max test involves a graded exercise test on any stationary exercise machine. The test starts at a very easy level and increases intensity in oneminute stages until the you cannot continue. Your nose and mout are covered and you will be primarily breathing through your mouth. This mask is connected to the metabolic analyzer that measures the volume and percentage of carbon dioxide and oxygen in the expired gas. You will also be wearing a heart-rate monitor. From the data aquired it is then possible for us to calulate the following thresholds.

AEROBIC THRESHOLD: Aerobic threshold is the intensity or heart-rate at which an individual burns the most fat. Using fat for fuel, more oxygen is required to release a given amount of energy than when carbohydrate is the main fuel. This means that at low intensities, when plenty of oxygen is available to the muscle, fat is the preferred fuel. As intensity increases, at some point the cardiovascular system will not be able to transport proportionally more oxygen the muscles. This is the aerobic threshold. Above this point, increased intensity will reduce fat burning.

ANAEROBIC THRESHOLD: Known as the red-line to endurance athletes, this threshold is the highest intensity, as measured by heart rate, at which the body can remove lactic acid as quickly as it is produced. Just below anaerobic threshold (AT), an athlete is working hard, but feels no burning in the muscles and is breathing heavily, but controlled. Above AT, lactic acid is building up in the muscles and will cause premature fatigue. Knowing one’s threshold allows one to achieve a very high level of cardiovascular conditioning without the discomfort and muscle damage of lactic acid buildup.

VO₂ MAX: For those who take the test to completion (so that we are able to determine VO2 Max), VO2 Max is the volume of oxygen the body uses during one minute of maximal exercise. Expressed as liters of oxygen per minute or milliliters of oxygen per kilogram of bodyweight per minute, this data tells your potential for endurance athletics. While anaerobic threshold is the best predictor of current endurance performance, VO2 Max indicates the potential of an athlete after several years of systematic, structured training.