A Look Inside a V02 Max Test: What It Is, Why It's Important, and What It Tells Us

For many years, exercise scientists have known that cardiorespiratory exercise — often called aerobic exercise — is essential for a healthy heart and weight management. 

However, it’s only been in the last ten years that aerobic fitness has emerged as a biomarker of longevity. Aerobic fitness is measured objectively as an individual’s VO2 max. The American Heart Association supports the use of aerobic fitness, or VO2 max, as a vital sign alongside other health markers like blood pressure, BMI, and blood sugar when assessing health and risk. 

Here, we’re diving into what VO2 max is, why it matters for longevity and performance, and how understanding your number can help you take a more informed approach to your health.

What is VO2 Max? 

VO2 max represents the maximum amount of oxygen your body uses during aerobic exercise. The “V” stands for volume, and “O2” for oxygen. It measures how efficiently your body takes in oxygen from the air and uses it at the cellular level. The more oxygen you can breathe in, the more energy your cells produce, allowing you muscles to move better. In other words, when you breathe in more oxygen (or have a high VO2 max), you can do harder things more easily. 

VO2 Max as a Marker of Longevity 

Over the last 30 years of exercise physiology research, VO2 max has consistently ranked among the strongest predictors of health and longevity as we age. It continues to be independently, inversely, and strongly correlated to better health outcomes. Individuals with lower levels of aerobic fitness are at a higher risk of cardiovascular disease, all-cause mortality, and mortality from certain cancers. VO2 max may also be a stronger predictor of mortality than smoking, high blood pressure, high cholesterol, and type 2 diabetes. Additionally, individuals with a high VO2 max experience less cognitive decline over time.  

The good news? It’s highly adaptable, and you don’t have to be an elite athlete to reap these benefits. 

How It’s Measured 

VO2 max is measured by indirect calorimetry during a 10–15-minute exercise test on a treadmill or a stationary cycle ergometer. The test requires you to wear a mask and a heart rate monitor. The mask measures your breathing — the amount of oxygen you breathe in and how much carbon dioxide you exhale. The test begins at an easy, warm-up intensity. Then, every 2–3 minutes, the intensity increases until you reach physiological max. This is the best and most accurate way to measure aerobic fitness. It also provides greater insight into how you should be training for your physiology. 

Many wearable devices, watches, straps, and rings may give an estimate of your VO2 max or a “cardio fitness score.” Although improving, these devices are generally not very accurate. They are, however, useful for tracking changes in your fitness over time. They more accurately reflect improvements or losses in fitness. So, we recommend following the trend over time rather than focusing on the exact number your device gives you. 

Improving Your VO2 Max 

VO2 max, or aerobic fitness, is very easy to influence. You can improve your fitness no matter how old you are or when you begin exercising. Of course, there are genetic components of fitness, but through smart training, VO2 max can be significantly improved by following these three tips: 

1. Choose an aerobic activity you enjoy! This may include things like dancing, hiking, swimming, cycling, jogging, or rowing. 

2. Aim for a goal of 75–150 minutes per week of this activity. 

3. Increase your heart rate moderately. Aim for 70–85% of your predicted maximum heart rate. If you don’t have a heart rate monitor, try a simple talk test: you should be able to talk but not sing. 

How Canyon Ranch Can Help 

At Canyon Ranch, we offer VO2 max testing as a stand-alone service and as part of several of our stay packages. For those looking to go even deeper, our LONGEVITY8™ program uses VO2 max alongside over 200 other biomarkers to create a truly personalized plan for extending both lifespan and healthspan. 

So, if you're ready to take your longevity seriously, VO2 max is your starting line, and Canyon Ranch is here to help you cross the finish.