The Importance of VO2 Max After 50
I have been endurance training for most of my adult life. In fact, I recently wrote a short story on Substack based on my college days, https://tomstratman.substack.com/p/the-river?r=3s5xzoThere are three major biomarkers in endurance training: VO2max, lactate threshold, and exercise economy (efficiency). For the over 50 casual athlete, VO2max after 50 is the most difficult of the three to increase.
VO2 max, the most oxygen your body can use during all-out effort, is one of the strongest predictors of how long and how well you will live, and it responds to training at any age.
Research ranks aerobic capacity alongside, and often above, blood pressure and cholesterol as a risk factor, and it decides whether stairs, groceries, and grandchildren feel easy or exhausting.
Here is what VO2 max is, what the largest studies say about it, why it falls with age, and how to raise it safely.
In This Post
- What VO2 Max Actually Measures
- VO2 Max and Longevity: What the Evidence Shows
- Why VO2 Max Declines With Age, and How Much Is Up to You
- How to Raise Your VO2 Max Safely After 50
- The Bottom Line
- References
What VO2 Max Actually Measures
VO2 max is the highest rate at which your body can take in, deliver, and use oxygen during maximal exercise. It is expressed in milliliters of oxygen per kilogram of body weight per minute (mL/kg/min), so it reflects the combined performance of your lungs, heart, blood vessels, and working muscle.
The gold standard is a graded exercise test in a lab, where you wear a mask that analyzes the air you breathe while the treadmill or bike gets harder every minute. Clinicians often express the result in METs, where 1 MET equals 3.5 mL/kg/min, the oxygen you use sitting at rest.
You do not need a lab to get a useful estimate. Field tests such as a timed 1.5 mile run or a 12 minute walk or run, and the estimates on many fitness watches, can track your own trend over time. Treat watch numbers as rough guides, not diagnoses. Because the number is divided by body weight, losing excess body fat can raise your VO2 max even when your heart and lungs have not changed.
VO2 Max and Longevity: What the Evidence Shows
Higher aerobic fitness is consistently linked to lower death risk, and the gap between the least fit and the most fit is larger than for most conventional risk factors.
| Study | Who | Key finding |
|---|---|---|
| Kodama et al., 2009 (JAMA) | Meta-analysis of 33 studies; 102,980 participants for all-cause mortality | Each 1 MET higher fitness was linked to 13% lower all-cause mortality and 15% lower heart disease and cardiovascular events. Low fitness carried a 70% higher risk of death than high fitness. |
| Mandsager et al., 2018 (JAMA Network Open) | 122,007 adults, mean age 53, treadmill tested 1991 to 2014, median 8.4 years follow-up | Elite fitness was associated with about an 80% lower mortality risk than low fitness, with no upper limit to the benefit. Each step down in fitness raised risk by an amount comparable to or greater than coronary artery disease, smoking, or diabetes. |
| Ross et al., 2016 (American Heart Association statement) | Scientific statement reviewing the evidence | Recommends measuring cardiorespiratory fitness in routine care as a clinical vital sign. Low fitness carries a risk comparable to or higher than smoking, hypertension, high cholesterol, and type 2 diabetes. |
The Mandsager finding matters most for readers in their 50s and beyond. The patients averaged 53 years old, and the benefit kept growing at every fitness level, so there is no point at which you have trained enough. These are observational studies, which show strong association rather than proof of cause, but the pattern is consistent across populations and decades.
Why VO2 Max Declines With Age, and How Much Is Up to You
VO2 max falls with age, but the rate depends heavily on how much you keep training. A 2022 review of aging masters endurance athletes found that men who held their training volume within 10% of normal lost about 5% to 6.5% of their VO2 max per decade. Those who cut volume by more than 20%, or became nearly sedentary, lost about 15% to 46% per decade (Burtscher et al., 2022).
In that review, changes in training volume alone explained 54% of the variation in VO2 max decline in men. Age matters, but behavior matters more than most people assume.
The flip side is detraining. In young athletes, VO2 max dropped about 7% after 12 days of stopping and about 18% after 12 weeks. A layoff from illness, travel, or injury therefore costs real fitness quickly, which is one reason consistency beats intensity for most people over 50.
How to Raise Your VO2 Max Safely After 50
Older adults respond well to aerobic training. A meta-analysis cited in the Burtscher review found a 16.3% VO2 max gain in previously sedentary adults over 60, with larger gains in programs lasting longer than about 16 to 20 weeks. The same review cites 9% to 13% gains after 8 weeks of high intensity interval training (HIIT) across ages 20 to 70 and beyond, with no significant difference between age groups. An indoor cycling class is an excellent venue for HIIT training. It’s where you will find me.
A practical weekly structure combines easy volume with one or two hard sessions:
| Session | What it looks like | Purpose |
|---|---|---|
| 2 to 3 easy aerobic sessions | 30 to 60 minutes at a conversational pace (walk, cycle, swim, row) | Builds the aerobic base and supports recovery |
| 1 interval session | Norwegian 4×4: 4 minutes hard, 3 minutes easy, repeated 4 times, after a warm-up | Directly stimulates VO2 max |
| 2 strength sessions | Full body, focus on legs, hips, and back | Preserves muscle and joint health that support aerobic work |
The 4×4 format was popularized by Norwegian researchers, first tested against moderate continuous training in heart failure patients (Wisløff et al., 2007). Hard intervals are typically done at roughly 85% to 95% of maximum heart rate, which should feel hard but controlled. Start with fewer intervals or shorter work periods, and add volume over several weeks.
Before starting intervals, get medical clearance if you have heart disease, high blood pressure, diabetes, or have been inactive for a long time. Stop and seek care for chest pain, unusual shortness of breath, or dizziness. Anyone on beta blockers or other heart rate altering medication should use perceived effort rather than heart rate targets.
The Bottom Line
VO2 max is one of the few health numbers that predicts how long you will live and also tells you how capable you will feel in daily life. It declines with age, but the decline is far from fixed: consistent training slows it, and structured training can raise it even in your 60s and 70s.
The next step is simple. Get a baseline, through a lab test, a field test, or a watch estimate you track over time. I use a Garmin watch. Build an easy aerobic routine, add one interval session once your doctor agrees, and retest in 8 to 12 weeks. If you want help turning this into a plan that respects your joints, medications, and history, that is the work we do at Solid to the Core.
Next up: The Importance of Lactate Threshold
References
Burtscher, J., Strasser, B., Burtscher, M., & Millet, G. P. (2022). The impact of training on the loss of cardiorespiratory fitness in aging masters endurance athletes. International Journal of Environmental Research and Public Health, 19(17), 11050. https://doi.org/10.3390/ijerph191711050
Kodama, S., Saito, K., Tanaka, S., Maki, M., Yachi, Y., Asumi, M., Sugawara, A., Totsuka, K., Shimano, H., Ohashi, Y., Yamada, N., & Sone, H. (2009). Cardiorespiratory fitness as a quantitative predictor of all-cause mortality and cardiovascular events in healthy men and women: A meta-analysis. JAMA, 301(19), 2024-2035. https://doi.org/10.1001/jama.2009.681
Mandsager, K., Harb, S., Cremer, P., Phelan, D., Nissen, S. E., & Jaber, W. (2018). Association of cardiorespiratory fitness with long-term mortality among adults undergoing exercise treadmill testing. JAMA Network Open, 1(6), e183605. https://doi.org/10.1001/jamanetworkopen.2018.3605
Ross, R., Blair, S. N., Arena, R., Church, T. S., Després, J.-P., Franklin, B. A., Haskell, W. L., Kaminsky, L. A., Levine, B. D., Lavie, C. J., Myers, J., Niebauer, J., Sallis, R., Sawada, S. S., Sui, X., & Wisløff, U. (2016). Importance of assessing cardiorespiratory fitness in clinical practice: A case for fitness as a clinical vital sign. Circulation, 134(24), e653-e699. https://doi.org/10.1161/CIR.0000000000000461
Wisløff, U., Støylen, A., Loennechen, J. P., Bruvold, M., Rognmo, Ø., Haram, P. M., Tjønna, A. E., Helgerud, J., Slørdahl, S. A., Lee, S. J., Videm, V., Bye, A., Smith, G. L., Najjar, S. M., Ellingsen, Ø., & Skjærpe, T. (2007). Superior cardiovascular effect of aerobic interval training versus moderate continuous training in heart failure patients: A randomized study. Circulation, 115(24), 3086-3094. https://doi.org/10.1161/CIRCULATIONAHA.106.675041
