VO₂max – The Most Important Number in Health and Sports

Learn what VO₂max is, why it matters for your health, and how to measure and improve it safely with science-backed methods.

What is VO₂max?

VO₂max — or maximal oxygen uptake — is the amount of oxygen your body can absorb and use per minute of intense physical activity. It’s a direct measure of how powerful your heart is, and how efficiently your lungs, blood vessels, and muscles work together under stress. In simple terms: VO₂max reflects your endurance capacity.A higher VO₂max means your cardiovascular system is stronger, more elastic, and more capable of sustaining energy output. A lower VO₂max means reduced capacity — and greater risk of decline.

VO₂max decreases on average by 1% per years, accelerating in older age. This decline is associated with:• Increased risk of cardiovascular disease• Reduced energy and lower work capacity• Greater vulnerability to illness and longer recovery times.

VO₂max isn’t fixed — it’s trainable. With the right exercise, your body can increase its pumping capacity and effectively improve both performance and health outcomes.

The Metric That Defines Performance

VO₂max is the golden standard in endurance sports. It reflects how efficiently the body delivers and uses oxygen during high-intensity activity. The higher your VO₂max, the more energy your muscles receive, the longer you can maintain performance, and the faster you recover. VO₂max isn’t just a sports metric.Top athletes like Cristiano Ronaldo, Messi, and clubs such as Real Madrid, Barcelona, Celtic, as well as national sports federations and Olympic athletes have all focused on improving VO₂max to gain a competitive edge.‍

Increasing VO₂max in sport results in:

• Higher endurance and sustained power
• Faster recovery between high-intensity efforts
• Lower energy cost at every speed — making you more efficient

It’s measurable, trainable, and directly correlated with success in both individual and team sports.

The Strongest Predictor of Mortality and Life Quality

Outside of sports, VO₂max becomes even more critical. It reflects the pumping capacity of your heart and the elasticity of your vascular system. When these systems weaken, your body’s ability to deliver oxygen drops — and so does your ability to recover, resist illness, or maintain independence.“Your VO₂max says more about your physical health than any other parameter we know — a far stronger indicator of health than blood pressure, cholesterol, or BMI combined.” - prof. Jan Hoff

A higher VO₂max correlates with:• Lower risk of cardiovascular disease, diabetes, and lifestyle-related illness• Faster recovery from events like surgery or infection• Improved circulation, metabolism, and brain health• Shorter rehabilitation time and reduced frailty as you age

Most people aren't aware of the importance of their VO₂max — but they should. It tells you more about your health than any other measurement.

How to Improve Your VO₂max

The Dallas Bed Rest and Training Study by Saltin et al.1 (1968) is one of the most cited experiments in exercise science — and for good reason. It revealed just how sensitive your VO₂max is to inactivity, and how critical movement is for heart health. The study showed that three weeks of strict bed rest for five healthy 20-year-old men resulted in a 27% dramatic drop in VO₂max, alongside reduced cardiac output and stroke volume. But if inactivity accelerates aging, can training reverse it? That’s exactly what a recent two-year study by Howden et al.2 (2018) has shown. They decided to investigate whether high-intensity exercise program could reverse cardiac aging in previously sedentary middle-aged adults. Participants who performed 4–5 sessions of aerobic exercise per week, including at least one 4x4 interval, experienced a 25% increase in VO₂max and significant improvements in their heart elasticity and pumping function — reversing decades of sedentary heart aging. The study concluded that committed exercise starting in midlife can restore youthful heart function and reduce the risk of heart failure later in life.The effect of age and VO₂max has been throuorugly researched for decades. A study by Støren et al.3 (2017) showed that all age‑groups responds well to HIIT training and improved their VO₂max by 9‑13%, with no significant drop in responsiveness by age. These findings imply that individuals across age all have a great potential for cardiovascular improvements, and that HIIT may be used as an excellent strategy for healthy aging.

Explore the science behind the 4x4 Intervals

Comparing Training Methods for VO₂max Improvement

Many forms of exercise are promoted for health, but a study by Helgerud et al.4 (2007) shows that only a few actually improve VO₂max in an effective way — and intensity plays a critical role. A well-known study set out to compare the effectiveness of four popular training methods:• Long Slow Distance (often referred to as Zone 2)• Lactate Threshold Runs• 15/15 Intervals (15 seconds high, 15 seconds low)• 4x4 Minute Intervals (at 90–95% of HRmax)All groups trained with equal total workload, but the results weren’t equal.

Fun fact: The 15/15 group had to perform 47 intervals per session to match the total work of the other methods. This is a lot of start and stop and thus very difficult to administer.The takeaway? If you want to improve VO₂max efficiently, 4x4 intervals offer the most potent and practical method available.

Measuring VO₂max: Clinical Testing vs. Alternative Methods

Traditionally, VO₂max is measured in a laboratory environment. This usually involves a treadmill or bike test performed to the point of exhaustion while wearing a mask that analyzes gas exchange. While accurate, this method is:• Expensive• Time-consuming• Uncomfortable• Inaccessible for many individuals, especially those recovering from illness or surgery

More recently, validated digital methods for measuring VO₂max have emerged. In a study by Helgerud et al.5 (2017), the technology now used in both Myworkout GO and Myworkout 4x4 accurately estimated VO₂max through a standardized in-app walking and running protocol — with a margin of error as low as 4.5%, compared to 3% for traditional laboratory testing.

Myworkout 4x4:• Utilizes DEM technology, your phone’s sensors and GPS to map the terrain in real-time• Requires no mask, lab, or maximum-effort testing• Is affordable, safe, accessible, and repeatable in real-world conditions

VO₂max = The Fountain of Youth

Improving your VO₂max isn’t just about performance. It’s about ageing better and slowlier. Research3 shows that you can improve VO₂max by 9‑13% through high‑intensity interval training in 8 weeks. The same training effects are regardless of age.When your heart works more efficiently, your body moves better, your systems age slower — you gain years of functional life, not just more years alive. That’s why VO₂max is the most important number in health. Measure it. Train it. Add years to your life.

Measure your VO₂max today

Download our app and measure your VO₂max with scientific precision for a lower price and effort than through the gold-standard lab-test.