04/07/2026
Happy World Health Day!
In honor of World Health Day, it is prudent to discuss one of the most important metrics of health and longevity, VO2 max. A person's VO2 max is defined as the maximum rate at which the body can consume oxygen. VO2 max is reached during a bout of maximal exercise, it is measured in mL/kg/min, and is the strongest predictor of all-cause mortality.
The best way to increase VO2 max is through endurance exercise. By effectively combining low intensity and high intensity cardio at about a 4:1 ratio respectively you can optimize performance and cardiac health.
The low intensity consists of easy work at a Zone 2 intensity (50-65% of max heart rate). At this intensity, you are primarily using fat as a fuel source. This builds an aerobic base and increases mitochondrial mass, allowing the body to become more oxygen efficient.
The high intensity work should consist of high-intensity interval training (HIIT). These are shorter intervals (2-5 minutes) followed by a rest period (2-5 minutes). Each interval is performed at over 85% max heart rate and places the body under high metabolic stress. This primarily uses glycogen as a fuel but burns high amounts of fat post-exercise. This is very effective for increasing VO2 max and additionally, sprint intervals (about 20 seconds each) can be used to increase the body's ability to regenerate ATP and phosphocreatine.
Combining all of these factors will contribute to a higher VO2 max and with it, a longer and healthier life.