5 Things Most People Over 60 Get Wrong About VO2 Max

The single strongest predictor of how long you will live is a number most people have never measured. Here’s what it is, why it matters, and what to do about it.

^{The Long Ride with Greg Pallone (photo credit: Angel Santos)}

I joined my cycling club last week for a hill climb of pyramid intervals. I’ll spare you a tedious description of what this innocuously named workout requires from me, but it mostly involves gasping for air most of the workout.

The legs are burning. The lungs and heart are working at rates that feel near their limits. The effort is no longer conversational — you are consuming every breath, seemingly just to survive. And somewhere in that red zone, your body is doing something precise and measurable: it is reaching the ceiling of how much oxygen it can take in, transport, and use.

That ceiling is called your VO2 max. According to research now arguing with unusual clarity, it is the single most important number in your long-term health profile. More predictive than your blood pressure. More definitive than your cholesterol.

The Cooper Institute, which has tracked the health outcomes of hundreds of thousands of people over decades, has found that cardiorespiratory fitness is a stronger predictor of mortality than any of those factors combined.

Most people over 60 have never had it measured, and many have never heard of it. Almost everyone who knows about it is making at least one of the five mistakes noted below.

Mistake 1: You think it’s too late to improve it.

This is the most common and most consequential mistake because it leads directly to inaction.

VO2 max declines with age — about 10 percent per decade after your mid-twenties, with the rate accelerating after 55. That part is true. What most people don’t know is that research estimates that 50 to 70 percent of that decline is preventable through consistent training.

Biology sets the slope. Behaviour determines how steep it gets.

Multiple meta-analyses have now confirmed that even among adults over 60, eight to twelve weeks of structured aerobic training can increase VO2 max by 5 to 10 percent. A 2025 systematic review in Frontiers in Aging, which examined randomized controlled trials in adults aged 60 to 85, found significant improvements in VO2 max across both interval and continuous training groups. These improvements were real, measurable, and clinically meaningful.

The lead researchers on the JACC 46-year follow-up study — one of the longest-running studies of fitness and mortality — found that each unit increase in VO2 max was associated with a 45-day gain in longevity. They also found that the benefits of higher midlife cardiorespiratory fitness persist well into later life.

It is not too late. The biology still responds. What it needs is the right stimulus.

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Mistake 2: You’re only doing Zone 2 and skipping intensity.

Zone 2 training — sustained aerobic work at a conversational pace — is genuinely valuable and highly recommended for adults 60 and older. It builds mitochondrial density, improves fat oxidation, enhances cardiac stroke volume, and is sustainable for decades. If you are a cyclist, swimmer, or walker who trains consistently in Zone 2, you are doing something important — don’t stop.

But you are also leaving significant gains in VO2 max on the table.

The research is consistent: high-intensity interval training yields greater gains in VO2 max than continuous moderate exercise.

The 2025 Frontiers in Aging review found that HIIT increased VO2 max by a mean of 1.62 ml/kg/min, compared with 1.22 ml/kg/min with continuous training. HIIT also improved cognitive function and muscle strength in older adults — benefits that steady-state aerobic training does not fully replicate.

The most studied protocol is the 4×4 Norwegian method: four minutes at 90 to 95 percent of your maximum heart rate, followed by three minutes of easy recovery, repeated four times. In adults over 40, this yields VO2 max gains of 7 to 15 percent over 8 to 12 weeks. Research suggests two sessions per week.

After age 60, the protocol should be adjusted. Shorten work intervals to one to two minutes. Lower the intensity ceiling to 85 to 90 percent of maximum heart rate. Extend recovery between intervals. Even with these modifications, research confirms that interval training improves VO2 max in older adults more effectively than continuous moderate exercise alone. The stimulus still works. It just needs to be applied with greater patience.

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Mistake 3: You don’t know your number, and you’re not tracking it.

You cannot manage what you don’t measure. Most people over 60 who exercise regularly have no idea what their VO2 max is.

A full laboratory test on a treadmill or cycle ergometer is the gold standard. Most sports medicine clinics and university exercise science departments offer these tests. If you have access to one, it is worth doing — particularly as a baseline before starting a structured programme.

For cyclists, note that VO2 max measured on a cycle ergometer is approximately 22 percent lower than on a treadmill, so compare within the same modality.

There is a related metric worth understanding alongside VO2 max, and in some ways easier to track daily: heart rate variability, or HRV. While VO2 max measures your cardiovascular ceiling — the maximum your system can produce — HRV reflects the quality of your recovery and the readiness of your autonomic nervous system. It is the variation in time between heartbeats at rest, and a higher HRV generally indicates a well-recovered, adaptable cardiovascular system.

A 2024 narrative review in the Journal of Functional Morphology and Kinesiology confirmed that RMSSD — the most tracked HRV metric — is correlated with improvements in VO2 max, running velocity, and time-trial performance in trained individuals. The relationship is not perfectly linear, and HRV is a better indicator of recovery status than of absolute fitness level. But the two metrics are companions: as your cardiorespiratory fitness improves, resting HRV tends to rise. As you overtrain or under-recover, it falls.

The practical value of HRV for adults over 60 is significant yet underused. Most modern wearables — Garmin, Whoop, Apple Watch, Oura — automatically measure and track HRV each morning.

A consistently low or declining HRV is one of the clearest signals that your body needs recovery rather than another hard session. For older athletes navigating the fine line between sufficient intensity and overreaching —where most of the VO2 max mistakes in this piece originate — HRV provides a daily readout that no single VO2 max test can offer. Think of VO2 max as the destination: how high is your ceiling? Think of HRV as the navigation: is today a day to push toward it, or a day to let the system rebuild?

According to the American College of Sports Medicine guidelines, a score above 22 ml/kg/min is considered optimal for men in their sixties. Above 18 is good. Below 15 is poor. For women in the same age group, the equivalent benchmarks are approximately 20 to 25 percent lower at each level. Know your number. Track it over time. It is the most accurate measure of how your cardiovascular system responds to your lifestyle.

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Mistake 4: You think being fit means your VO2 max is high.

This is the mistake I made, which I embarrassingly confirmed during the coached hill climb with TAG Cycling. I suspect it is common among people who train consistently and assume their cardiovascular health mirrors their training volume.

VO2 max can be elevated or suppressed by genetics, affected by sleep apnoea, impaired by anemia, or simply lower than expected for your training level, with no obvious explanation. Being aerobically active does not guarantee a healthy VO2 max. It only improves the odds. It doesn’t remove the doubt.

The research makes this clear in a finding that surprised me: an overweight person with a high VO2 max often has a lower mortality risk than a lean person with low cardiorespiratory fitness. Fitness outweighs weight as a predictor of longevity. Body weight is a visible, easy-to-measure proxy that culture has overinvested in. VO2 max is the variable that predicts survival.

The practical implication: training is necessary, but not sufficient evidence that your VO2 max is where it needs to be. The only way to know is to measure it. A cardiologist who reviews your VO2 max alongside your blood pressure, resting heart rate, and metabolic markers has a far more complete picture of your cardiovascular health than one who sees only your weight and cholesterol.

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Mistake 5: You don’t know the independence threshold — the number that changes everything.

This is the finding I want to ensure is clearly communicated, because it reframes VO2 max from a fitness metric to a functional health imperative.

Research has identified the independence threshold: the VO2 max level below which functional independence in daily life is significantly at risk. For men in their seventies, the threshold is approximately 20 ml/kg/min. For women, it is approximately 18 ml/kg/min.

Above those levels, recovery from surgery or illness is faster, fall risk is lower, and hospital stays are shorter. Below them, the body lacks sufficient cardiovascular reserve to meet the demands of daily life. That is when the slow decline becomes rapid.

A score below approximately 5 METs — roughly 17.5 ml/kg/min — is linked to a high risk of all-cause mortality, independent of other factors. Research from the American College of Cardiology found that each 1-MET increase in cardiorespiratory fitness was associated with an 11.6 percent reduction in all-cause mortality, a 16.1 percent reduction in cardiovascular mortality, and a 14 percent reduction in cancer mortality.

People with low VO2 max have been shown to face a 2 to 5 times higher risk of early death than those with high cardiorespiratory fitness — even when smoking, blood pressure, cholesterol, and diabetes are controlled.

This is not a peripheral fitness metric. It is the number that predicts how the second half of your life will look.

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Here is what the research supports doing, across the two training modalities that matter most for VO2 max after 60.

Zone 2 — the foundation.

Three to five hours per week of sustained aerobic work at a conversational pace — the effort level at which you can speak in full sentences but wouldn’t choose to. Cycling, swimming, walking, and rowing are examples. This builds mitochondrial density and cardiac output, which underpin everything else. For many adults over 60, brisk walking is the most accessible and sustainable Zone 2 modality. Don’t think of it as a lesser form of training. It is the right tool for the job over 60.

Interval work — the stimulus (60+).

One to two sessions per week of modified interval training. After a thorough warm-up, work at 85 to 90 percent of your maximum heart rate for 1 to 2 minutes, fully recover, and repeat 4 to 6 times. The session does not need to be long. It needs to be hard enough to push past the steady-state aerobic zone. This is the stimulus that increases VO2 max. Zone 2 maintains it. Intervals improve it.

Strength training — the support structure.

Resistance training two to three times per week preserves the muscle mass that supports cardiovascular output and lowers the body-weight-to-power ratio, which partially determines VO2 max. It is not a substitute for aerobic work. It is the foundation that makes aerobic work more effective and sustainable as you age.

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I have been racing and riding bikes for pleasure for most of my adult life. I understand effort. I have hit my red zone on a climb and didn’t like it. What I did not fully understand until I started reading the research that underpins this series was that the physiological response in that red zone is the most powerful cardiovascular health intervention available to me.

Every hard interval, when I push past the comfortable pace. Every workout, when my lungs work near their limit. These are not just training sessions. The evidence increasingly suggests they are acts of health maintenance at the cellular level — raising a number that predicts, more accurately than almost anything else, how long I will be here and how well I will function while I am.

Measure yours. Know your number. Then give it a reason to rise.

As always, consult your physician or a qualified exercise professional before beginning high-intensity training, particularly if you have existing cardiovascular conditions, have been sedentary for an extended period, or are returning to exercise after illness or injury.

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Research & sources referenced in this piece

Addleman, J.S., Lackey, N.S., DeBlauw, J.A. & Hajduczok, A.G. (2024). Heart Rate Variability Applications in Strength and Conditioning: A Narrative Review. Journal of Functional Morphology and Kinesiology, 9(2), 93. DOI: 10.3390/jfmk9020093

JACC. Midlife cardiorespiratory fitness and long-term risk of mortality: 46 years of follow-up. Journal of the American College of Cardiology.

Frontiers in Aging (May 2025). Enhancing active aging through exercise: comparative study of HIIT and continuous aerobic training in older adults. DOI: 10.3389/fragi.2025.1493827

NCBI / PMC (2025). Effects of HIIT on physical morphology, cardiopulmonary function, and metabolic indicators in older adults: systematic review and meta-analysis. PMC11975580

NCBI / PMC (2025). Effect of HIIT and moderate-intensity continuous training on cardiorespiratory function in healthy elderly: systematic review and meta-analysis. PMC12795074

Harvard Health Publishing (October 2024). HIIT workouts for older adults. health.harvard.edu

DexaFit (August 2025). VO2 Max and aging: what’s normal vs what’s preventable. dexafit.com

PNOE (April 2026). How to improve VO2 max after 40, 50, and 60. pnoe.com

ScienceInsights (May 2026). What’s a good VO2 max? Ranges by age and sex. scienceinsights.org

American College of Sports Medicine. ACSM’s Guidelines for Exercise Testing and Prescription. 11th ed. 2021.