Cold Exposure, Longevity and Mitochondria

What Is Longevity?

In a nutshell, longevity means living longer and better.

At ERA, longevity is understood through two dimensions:

Lifespan: how long we live.
Healthspan: how well we live.

It’s not about finding the “fountain of youth”, but about maximizing both lifespan and quality of life across physical, cognitive, and emotional dimensions.

What Influences Longevity?

Aging is a complex process involving multiple factors. These include:

Genetics: our DNA, or what we’re born with. On its own, this does not determine our health or how we age.
Epigenetics: our environment and various lifestyle-related factors can influence how our genes are expressed and how we age.
Lifestyle: physical activity, nutrition, sleep, stress, social relationships, and other habits.
The passage of time: biological aging is an inevitable and multifactorial process.

But there’s another component linked to aging that we’ll focus on in this article: mitochondria.

What Are Mitochondria and What Do They Have to Do with Longevity?

Mitochondria are found in almost every cell in our body and play a central role in our health. They are responsible for producing ATP, the energy cells use to carry out their functions.

As we age, changes occur in mitochondrial function and quality. Mitochondrial dysfunction is associated with various health issues, including chronic inflammation, neurological decline, and muscle dysfunction, among others.

What Is Cold Exposure and How Does It Work?

Cold therapy is a wellness practice that involves immersing the body in cold water for a few minutes (usually between 2 and 5 minutes).

Cold exposure acts as a hormetic stimulus: a brief dose of thermal stress that activates adaptive responses. These adaptations can have positive effects on health.

What happens to our bodies during cold therapy?

During the first 60 seconds: the cold shock response is activated, triggering vasoconstriction, an increase in heart rate, hyperventilation, activation of the sympathetic nervous system, and the release of adrenaline, dopamine, and noradrenaline.
Afterwards: thermogenesis begins. The body starts working (through brown fat and other mechanisms) to restore heat.

What Is the Relationship Between Cold Exposure, Mitochondria, and Longevity?

One of the effects of cold exposure on the body is mitochondrial activation.

When the body is exposed to low temperatures, it increases heat production to maintain its core temperature. This is where brown fat plays a key role: a specialized tissue responsible for generating heat and maintaining body temperature. This tissue contains a high concentration of mitochondria.

These mitochondria contribute to thermogenesis: they burn fat and glucose to generate energy in the form of heat, helping maintain a stable core body temperature.

What Other Benefits Does Cold Therapy Have for Longevity?

Reduces inflammation
Helps reduce stress and build resilience
Supports cardiovascular and immune system health
Helps regulate the circadian rhythm (when practiced in the morning)
Enhances emotional well-being
Promotes more consistent energy levels

Cold Exposure Protocol for Longevity

There is no one-size-fits-all protocol: when and how to practice cold therapy will depend on your goals.

However, here are some general cold exposure protocols you can try to start working towards better longevity:

To reduce inflammation and accelerate recovery: have a session after exercise, with water temperatures between 10 and 15 °C, for 3 to 5 minutes.
Strength or hypertrophy training: avoid cold therapy immediately after hypertrophy-focused training. Have your session 5 to 6 hours later.
Hormesis or mental resilience training: schedule your session separately from your workout or exercise. Water temperature between 7 and 10 °C, for 1 to 3 minutes, 2 to 4 times per week.
Circadian rhythm: practice cold therapy in the morning. Water temperature between 10 and 15 °C, for 1 to 3 minutes.

That said, the right cold exposure dose will always depend on the individual and the context. That’s why it’s important to keep the following in mind:

If you’re a beginner, start slowly: shorter sessions and less extreme temperatures.
Progress based on tolerance, not temperature.
Listen to your body and consider the context: some days your body may be tired or your mind overwhelmed, which can lower your tolerance to cold.
Ambient temperature: on warm days, it’s easier for the body to recover its temperature. On cold days, the opposite is true, so reduce the duration and intensity.

The goal isn’t to withstand more cold. It’s to get enough of a stimulus to trigger adaptation without turning it into excessive stress.

(*) People with cardiovascular conditions should not practice cold therapy, as it may pose a health risk. If in doubt, consult your primary care physician and/or cardiologist.

So, Can Cold Exposure Help with Longevity?

Cold exposure activates physiological mechanisms related to thermoregulation, the nervous system, brown fat, and mitochondrial activity. These mechanisms make cold exposure an interesting tool when it comes to longevity.

That said, cold exposure is one of several complementary tools. It is not a replacement for other fundamental pillars of health and longevity, such as physical activity, nutrition, sleep, and more.

Longevity isn’t built with a single tool or overnight. The earlier you start, the better the results, but any moment is a good moment to take action.