Video·3 min read·May 2026

Exploring the Harmony of Cold and Exercise: Insights from Recent Research

Cold Therapy • 3 min read • Based on research by Karri Parkkila, Rasmus I. P. Valtonen, Leena Hiltunen, Heidi E. Hintsala, Jouni J. K. Jaakkola, Tiina M. Ikäheimo (2021)

Imagine stepping into a serene sanctuary, where the invigorating chill of cold exposure meets the uplifting energy of movement. This fusion of elements can be profoundly restorative, especially for those navigating the complexities of coronary artery disease (CAD). Recent research sheds light on how combining submaximal exercise with cold exposure can influence our body’s internal dynamics, particularly regarding blood coagulation.

The study, conducted by a team of researchers, examined the effects of exercise performed in cold temperatures on individuals with stable CAD. With 16 participants engaging in brisk walking for 30 minutes in both cold and neutral environments, the findings offer valuable insights into how these practices may coexist harmoniously in recovery protocols.

Understanding Blood Coagulation and Its Implications

Blood coagulation is an essential process that helps our body prevent excessive bleeding. However, elevated coagulation factors can pose risks, particularly for those with cardiovascular conditions. The study focused on key parameters such as factor VII (FVII), fibrinogen, D-dimer, and von Willebrand factor (vWF)—all of which play roles in blood clotting.

The findings indicated that submaximal exercise in cold conditions does not significantly alter these coagulation parameters compared to exercise in neutral temperatures. This suggests that engaging in physical activity within a cold environment may not impose additional risks for individuals with stable CAD, allowing them to participate in recovery rituals without heightened concern.

The Benefits of Cold Exposure and Submaximal Exercise

Both cold exposure and exercise are known to enhance cardiovascular health. Cold exposure can stimulate circulation and invigorate the body, while exercise strengthens the heart and improves overall endurance. The study's results highlight that moderate exercise—performed for at least 30 minutes—remains beneficial, even in colder settings.

In this research, the participants exercised at 66-69% of their maximal heart rate, a level considered submaximal. This intensity is manageable and aligns with recommendations for cardiac rehabilitation, emphasizing that individuals can safely incorporate cold exposure into their routines without compromising their health.

Connecting Science to Everyday Practice

Understanding the interplay between cold exposure, exercise, and blood coagulation can empower individuals to make informed choices about their wellness practices. For those engaging in contrast therapy—alternating between heat and cold—this research underscores the importance of moderation and intentionality.

By recognizing that cold exposure does not significantly elevate coagulation parameters during moderate exercise, individuals can cultivate a sense of resilience and clarity in their recovery protocols. This knowledge transforms the experience from one of uncertainty to one of empowered choice.

Key Takeaways

Submaximal exercise in cold environments does not significantly affect blood coagulation parameters in individuals with stable coronary artery disease.
Incorporating cold exposure into exercise routines can be safe and beneficial, promoting cardiovascular health without added risks.
Understanding the science behind cold exposure and exercise can enhance recovery protocols, fostering resilience and clarity in wellness practices.

Based on: The effects of submaximal exercise and cold exposure on blood coagulation parameters in coronary artery disease patients
Karri Parkkila, Rasmus I. P. Valtonen, Leena Hiltunen, Heidi E. Hintsala, Jouni J. K. Jaakkola, Tiina M. Ikäheimo (2021). BMC Cardiovascular Disorders

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The effects of submaximal exercise and cold exposure on blood

The Fear Behind the Cold Walk

Here's a question I hear more than almost any other in this space: is it safe to exercise in the cold if you have a heart condition? The fear is understandable. Cold weather, cardiovascular risk, blood clotting — these words live together in the cultural imagination. Every winter, we're told about the spike in cardiac events when temperatures drop. So when Parkkila and colleagues at the University of Oulu sat down to actually test what happens to blood coagulation when CAD patients exercise in minus fifteen degrees Celsius, they were asking a genuinely important clinical question.

The answer they found is both reassuring and instructive. Submaximal exercise — brisk walking at 66 to 69 percent of maximum heart rate — performed in serious cold did not significantly alter blood coagulation parameters compared to the same exercise in a neutral temperature. Factor VII, fibrinogen, D-dimer, von Willebrand factor — these markers of clotting potential stayed essentially stable across conditions. For people with stable coronary artery disease, this is meaningful news.

Intensity Is Everything

What makes this finding land properly is understanding what it's sitting next to. Earlier work by Nagelkirk and colleagues showed that maximal exercise in cold does increase coagulation potential beyond what you'd see in neutral temperatures. The mechanisms are there — cold triggers sympathetic nervous system activation, vasoconstriction, elevated catecholamines. Exercise adds its own hemostatic load. Stack them at high intensity, and the combined effect amplifies risk.

But this study says: keep it submaximal, and that amplification largely disappears.

The cold doesn't make exercise dangerous. Pushing beyond your threshold makes it dangerous. The cold is just context — and context, it turns out, matters less than intensity when you stay within your capacity.

This is the same principle I see throughout the contrast therapy and cold exposure literature. The dose determines whether you're building resilience or breaking yourself down. Cold water immersion for two minutes after training? Adaptive signal. Two hours in ice water when you're already exhausted? Stress without recovery. The biology doesn't care about the source of the stressor — it cares about whether you overwhelm the system or just challenge it.

What This Means in Practice

For anyone with a cardiac history who lives in a northern climate — or who wants to incorporate cold outdoor movement into their recovery protocol — this research offers real permission. Moderate intensity endurance exercise in cold conditions appears safe from a coagulation standpoint. The operative word is moderate. The thirty-minute brisk walk at conversational pace. Not the sprint, not the high-intensity interval session, not the competition in a snowstorm.

The cardiac rehabilitation guidelines already recommend this exact intensity: regularly performed, moderate endurance work lasting at least thirty minutes. This study confirms that doing that work in cold weather doesn't add a meaningful clotting burden on top of the exercise itself.

The Surprising Connection

What I find most interesting here isn't the coagulation data — it's the implicit argument about environmental stressors. We've spent decades treating cold weather as inherently threatening to cardiac patients. And in some contexts, that's true — rest in extreme cold does stress the cardiovascular system. But movement in cold? That combination, at the right intensity, appears to be genuinely protective in its way, or at minimum, not the double danger we feared.

This reframes how I think about winter protocols. The body adapts to cold during exercise. The thermoregulatory demand is real, but it's also something the conditioned body handles. The risk isn't the cold. The risk is being sedentary in it, or pushing too hard within it. Keep moving, keep it moderate, and winter becomes a training environment rather than a threat.

The effects of submaximal exercise and cold exposure on blood

Exploring the Harmony of Cold and Exercise: Insights from Recent Research

Understanding Blood Coagulation and Its Implications

The Benefits of Cold Exposure and Submaximal Exercise

Connecting Science to Everyday Practice

Key Takeaways

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