Video·3 min read·May 2026

Harnessing Cold: The Benefits of Contrast Therapy for Enhanced Fat Utilization

Cold Therapy • 3 min read • Based on research by Dominique D. Gagnon, Hannu Rintamäki, Sheila S. Gagnon, Stephen S. Cheung, Karl-Heinz Herzig, Katja Porvari, Heikki Kyröläinen (2013)

Imagine stepping into a serene sanctuary, where the air is crisp and invigorating. This is the essence of contrast therapy—alternating between hot and cold environments to promote recovery and resilience. While many of us are familiar with the calming embrace of a sauna, the invigorating shock of cold exposure holds remarkable benefits that can enhance our physical performance and overall well-being.

A recent study sheds light on how cold exposure influences our body's energy utilization during exercise. Conducted by a team of researchers in Finland, the study revealed that exposure to cold temperatures can enhance fat oxidation, particularly during submaximal exercise like walking and running. This insight invites us to explore how we can integrate cold exposure into our wellness rituals for improved vitality.

The Science of Cold Exposure

In a controlled setting, ten male participants engaged in walking and running for an hour at temperatures of 0°C and 22°C. The findings were compelling: cold exposure led to a notable increase in fat utilization during exercise. Specifically, the study observed a decrease in the respiratory quotient (RQ), indicating a shift from carbohydrates to fat as the primary energy source.

What does this mean for you? Simply put, when you exercise in colder conditions, your body becomes more efficient at burning fat for fuel. This can be particularly beneficial for those looking to manage their weight or enhance their athletic performance.

Understanding Energy Sources

While the study highlighted increased fat utilization, it also noted that there were no significant changes in blood parameters related to fat and carbohydrate metabolism. This suggests that the body relies more on internal energy sources, specifically intra-muscular triglycerides, during cold exposure.

In practical terms, when engaging in physical activities in cold environments, your body taps into its reserves more effectively. This can lead to improved endurance and energy efficiency, allowing you to perform at your best, even in challenging conditions.

Integrating Cold Exposure into Your Wellness Protocol

So how can you incorporate cold exposure into your wellness routine? Consider alternating between sauna sessions and cold showers or ice baths. This contrast therapy not only enhances fat oxidation but also promotes recovery and resilience.

Start with a brief period of cold exposure after your workout. Gradually increase the duration as your body adapts. You may find that this practice not only aids in physical recovery but also instills a sense of clarity and stillness in your mind.

Key Takeaways

Cold exposure enhances fat utilization during exercise, making it a valuable tool for weight management.
The body becomes more efficient at using internal energy sources, particularly during physical activities in colder environments.
Incorporate contrast therapy into your wellness rituals by alternating between heat and cold for optimal recovery and resilience.

Based on: Cold exposure enhances fat utilization but not non-esterified fatty acids, glycerol or catecholamines availability during submaximal walking and running
Dominique D. Gagnon, Hannu Rintamäki, Sheila S. Gagnon, Stephen S. Cheung, Karl-Heinz Herzig, Katja Porvari, Heikki Kyröläinen (2013). Frontiers in Physiology

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Cold exposure enhances fat utilization but not non-esterified fatty

The Claim: Cold Makes You Burn More Fat

That's the headline, and it's true — but the mechanism is where things get genuinely interesting. The Gagnon team brought ten men into a climate chamber, had them walk and run for an hour at both 0°C and 22°C, and measured everything they could: respiratory quotient, blood glucose, non-esterified fatty acids, glycerol, catecholamines. The cold exposure group showed a measurable shift toward fat oxidation. Lower respiratory quotient. More grams of fat burned per minute. A greater percentage of total energy coming from fat rather than carbohydrate. The data is clean and the finding is real.

But here's the part that gets buried in the abstract: blood-based fat markers didn't budge. Non-esterified fatty acids — the free fats circulating in your bloodstream from adipose tissue breakdown — showed no difference. Glycerol, the backbone of triglyceride breakdown that serves as a reliable marker of lipolysis in fat tissue, also unchanged. Catecholamines — adrenaline and noradrenaline, the hormones that typically drive fat mobilization from adipose tissue — still flat.

You're burning more fat. But it's not coming from where you might expect.

Where the Fat Is Actually Coming From

The researchers point to intramuscular triglycerides — fat stored directly inside the working muscle cells — as the likely source. Your muscles maintain their own private reserve of fat, separate from the adipose tissue under your skin. This isn't the fat you're trying to lose from your waist. It's the fat your muscles keep on hand for efficient, sustained energy production.

Cold doesn't just make your body burn more fat. It shifts where that fat comes from — deeper into the muscle itself, bypassing the hormonal cascade that typically unlocks your fat stores.

This distinction matters more than it initially appears. Most of the research on cold exposure and fat burning assumes catecholamines are doing the work — that cold triggers adrenaline release, which signals adipose tissue to release fatty acids into circulation, which then get burned as fuel. That's the standard model. This paper challenges it, at least for walking and running intensity exercise.

Where the Research Lands

The literature on cold and fuel selection is genuinely inconsistent. Some cycling studies show cold increases carbohydrate use, not fat. Others show no change. This paper controlled for two confounders that plagued earlier work: they kept oxygen consumption constant between conditions (so shivering-induced extra VO2 couldn't skew the results), and they prevented core temperature from dropping (which eliminates temperature-induced metabolic changes). By isolating those variables, they got cleaner data — and their finding holds: fat oxidation goes up in the cold during walking and running specifically, even when the hormonal levers typically associated with fat burning aren't being pulled.

The walking and running piece matters too. Treadmill exercise recruits more total muscle mass than cycling. More muscle engaged means more distributed heat production, better circulation, and — as the researchers suggest — a metabolic environment where intramuscular triglycerides become preferential fuel. Cold may amplify that tendency rather than create it from scratch.

The Practical Takeaway

If you're doing steady-state cardio — walking, jogging, hiking — doing it in cooler conditions genuinely shifts your fuel mix toward fat. You don't need ice baths or extreme cold. The study used 0°C, but the relevant principle is avoiding overheating. An early morning walk before the day warms up, an outdoor run in autumn or winter, skipping the heavy layers that trap heat during exercise — these aren't gimmicks. They create a metabolic environment where your muscles preferentially reach for their own fat reserves.

The Connection Worth Sitting With

There's something quietly profound about intramuscular fat as the primary fuel source here. We spend enormous energy thinking about adipose tissue — the visible fat, the metabolic fat, the fat we're trying to lose. But the body maintains a parallel system inside the muscle itself, and cold may be one of the cleaner signals for tapping into it. This connects to research on endurance athletes, who have significantly higher intramuscular triglyceride stores and greater capacity to use them. Cold exposure, even at moderate exercise intensities, may be training a similar pathway. Not by shrinking fat cells, but by improving how efficiently your muscles use the fuel they've already stored.

Cold exposure enhances fat utilization but not non-esterified fatty

Harnessing Cold: The Benefits of Contrast Therapy for Enhanced Fat Utilization

The Science of Cold Exposure

Understanding Energy Sources

Integrating Cold Exposure into Your Wellness Protocol

Key Takeaways

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