VO₂ max and longevity: why fitness is becoming one of the strongest ageing markers

Longevity is not only about what you take. It is also about what your body can do.

One of the strongest examples of this is VO₂ max - a measure of how well your body uses oxygen during intense exercise. It reflects how efficiently your heart, lungs, blood vessels and muscles work together to deliver and use oxygen.

In simple terms, VO₂ max shows the capacity of your body’s energy system.

This is why it has become such an important topic in longevity science. It is not only a performance metric for athletes. It is also one of the clearest indicators of cardiorespiratory fitness, and cardiorespiratory fitness is strongly linked with long-term health outcomes.

At L Cell, we see VO₂ max as part of a wider longevity conversation: cellular energy, mitochondrial function, muscle, recovery, metabolic health and consistency.

What is VO₂ max?

VO₂ max stands for maximal oxygen uptake. It measures the maximum amount of oxygen your body can use during intense physical activity.

To produce energy during exercise, the body needs oxygen. The heart pumps oxygen-rich blood, the lungs bring oxygen into the body, blood vessels transport it, and muscles use it inside mitochondria to help create energy.

A higher VO₂ max generally means the body is better at this process.

That does not mean everyone needs to train like an athlete. It means that the ability to deliver and use oxygen is one of the most useful ways to understand physical resilience.

Why VO₂ max matters for healthy ageing

VO₂ max usually declines with age, especially when physical activity decreases. This decline can affect stamina, recovery, daily energy and the ability to handle physical stress.

Research has consistently shown that higher cardiorespiratory fitness is associated with lower risk of all-cause mortality. A large 2018 study found that cardiorespiratory fitness was inversely associated with long-term mortality, with no observed upper limit of benefit. 

A 2024 overview of meta-analyses also concluded that cardiorespiratory fitness is a strong and consistent predictor of morbidity and mortality among adults. 

This is why VO₂ max is becoming one of the most discussed markers in longevity. It gives a clearer picture than appearance alone. Someone can look healthy but have poor aerobic capacity, low muscle mass, unstable energy and poor recovery.

Healthy ageing is not only how you look. It is how well your systems work.

VO₂ max, mitochondria and cellular energy

VO₂ max is closely connected to mitochondria.

Mitochondria are the parts of the cell involved in energy production. During aerobic exercise, they help use oxygen to create ATP, the energy currency of the cell.

When you improve aerobic fitness, you are not only training your heart and lungs. You are also training the body’s ability to use oxygen more efficiently at the cellular level.

This is why VO₂ max belongs in the same conversation as mitochondrial health, NAD+ biology and cellular energy. These systems are not separate. They are different layers of the same question: how well can the body produce and manage energy?

L Cell NAD+ Formula, NR and NMN belong to the cellular energy conversation because NAD+ is involved in energy metabolism and is widely discussed in ageing research. They are not replacements for exercise, but they fit into a longevity routine built around energy at the cellular level.

Why muscle also matters

VO₂ max is often discussed as a cardiovascular marker, but muscle is part of the system too. Muscles are where oxygen is used during movement. More active and better-conditioned muscle tissue improves the body’s capacity to handle energy, glucose and physical stress.

This is one reason strength training should sit beside aerobic training in a longevity routine. Aerobic work supports oxygen delivery and cardiovascular fitness. Strength training supports muscle mass, power, glucose handling and long-term physical independence.

L Cell Creatine Monohydrate fits into this part of the routine because creatine is one of the most researched ingredients for short bursts of high-intensity exercise and strength-related performance. It does not replace training, but it can support a routine where muscle is treated as a core part of healthy ageing.

How to improve VO₂ max

Improving VO₂ max does not require extreme training, but it does require consistency.

The most effective approach usually combines steady aerobic work with higher-intensity intervals. Zone 2 training, such as brisk walking, cycling, jogging or rowing at a sustainable pace, helps build an aerobic base. Short interval sessions can challenge the upper end of your oxygen-use capacity.

For most people, the best routine is simple: move often, build endurance gradually, add intensity carefully and recover properly.

Recovery matters because adaptation happens between sessions. Poor sleep, low protein intake, under-eating, overtraining and chronic stress can all make progress harder.

This is where foundational support becomes relevant. Magnesium contributes to normal energy-yielding metabolism, normal muscle function, normal nervous system function and the reduction of tiredness and fatigue. Omega-3 fatty acids EPA and DHA contribute to normal heart function, while DHA contributes to normal brain function and vision. These are not exercise replacements, but they belong in a routine that supports the systems involved in training and recovery.

Why VO₂ max is not just for athletes

VO₂ max is relevant because daily life also requires physical capacity. Walking uphill, climbing stairs, carrying bags, travelling, recovering from illness, training consistently and staying independent with age all depend on the body’s ability to produce energy and tolerate physical demand.

A higher VO₂ max gives the body more reserve.

This reserve is one of the most important ideas in longevity. The goal is not only to avoid disease. The goal is to build enough capacity that the body can handle stress, recover well and remain functional for longer.

How L Cell fits into a fitness-based longevity routine

A strong longevity routine should start with movement, nutrition, sleep and recovery. Supplements can then make the routine more targeted.

For cellular energy and NAD+ biology, L Cell NAD+ Formula, NR or NMN may fit into a more advanced routine.

For strength, power and muscle performance, L Cell Creatine Monohydrate is a practical daily option.

For normal energy metabolism, muscle function, nervous system function and tiredness, L Cell Magnesium can support the foundation.

For normal heart function, L Cell Omega 3 Elite provides a high-strength source of EPA and DHA.

The key is to understand the hierarchy. VO₂ max improves through training. Supplements do not replace that work. Their role is to support the wider biological systems that make consistent training, energy and recovery possible.

Scientific sources

Lang JJ et al. (2024). Cardiorespiratory fitness is a strong and consistent predictor of morbidity and mortality among adults: an overview of meta-analyses representing over 20.9 million observations from 199 unique cohort studies. British Journal of Sports Medicine.

Mandsager K et al. (2018). Association of Cardiorespiratory Fitness With Long-term Mortality Among Adults Undergoing Exercise Treadmill Testing. JAMA Network Open.

Kodama S et al. (2009). Cardiorespiratory fitness as a quantitative predictor of all-cause mortality and cardiovascular events in healthy men and women: a meta-analysis. JAMA.

Covarrubias AJ et al. (2020). NAD+ metabolism and its roles in cellular processes during ageing. Nature Reviews Molecular Cell Biology.

Bagheri R et al. (2021). Effects of creatine supplementation on muscle strength, body composition and physical function in older adults: a systematic review and meta-analysis. Journal of Cachexia, Sarcopenia and Muscle.

European Commission EU Register of Nutrition and Health Claims.