Video·3 min read·May 2026

Understanding Cryotherapy: The Science of Cold and Its Lasting Effects

Cold Therapy • 3 min read • Based on research by Sepideh Khoshnevis, Natalie K. Craik, Kenneth R. Diller (2015)

Have you ever stepped into a cold plunge or sauna, feeling the shock of temperature change wash over you? This moment of contrast can be invigorating, pushing your body to adapt and recover. But while we often focus on the immediate benefits of these practices, what happens beneath the surface? Recent research sheds light on a crucial aspect of cryotherapy that can help you optimize your wellness ritual.

A study conducted by Khoshnevis, Craik, and Diller reveals that the effects of cold exposure extend far beyond the initial cooling phase. Understanding this persistence of cold-induced vasoconstriction can empower you to make informed decisions about your recovery protocols, enhancing your journey towards resilience and longevity.

The Mechanism Behind Cryotherapy

Cryotherapy, or cold therapy, is widely recognized for its ability to reduce swelling and pain by inducing vasoconstriction—essentially narrowing blood vessels in the treated area. This response helps to manage inflammation, making it a favored technique in sports medicine and rehabilitation.

The study examined four different cryotherapy devices, measuring skin temperature and blood flow during and after cooling. Remarkably, the researchers found that blood flow remained significantly depressed even after the cooling period ended. This means that while your skin may feel warm again, the underlying vasoconstriction can persist, limiting blood flow to the area.

What Does This Mean for Your Recovery?

The implications of this research are profound. When you engage in cryotherapy, you may be inadvertently extending the state of reduced blood flow, which can increase the risk of nonfreezing cold injury (NFCI). This risk underscores the importance of understanding how long to apply cold therapy and how often to repeat the process.

In the study, subjects experienced significant vasoconstriction across all devices tested, with blood flow not returning to normal levels even after passive rewarming. This finding suggests that your body may need a deliberate recovery period before engaging in further treatments. It’s essential to listen to your body and allow for adequate time between sessions to promote optimal healing.

Integrating This Knowledge Into Your Wellness Ritual

By recognizing the nuances of cryotherapy, you can refine your approach to wellness. Start by incorporating shorter, controlled sessions of cold exposure, followed by ample time for rewarming and recovery. This thoughtful approach can enhance your body’s resilience and recovery capabilities.

Consider alternating between cold and heat therapies, allowing your body to find equilibrium. Combining sauna sessions with cold plunges can create a balanced ritual that promotes circulation and overall wellness, while also minimizing the risks associated with prolonged vasoconstriction.

Key Takeaways

Vasoconstriction from cryotherapy can persist long after cooling, affecting blood flow and recovery.
Understanding this persistence can help you adjust the duration and frequency of cryotherapy sessions for safer practices.

Based on: Cold-induced vasoconstriction may persist long after cooling
Sepideh Khoshnevis, Natalie K. Craik, Kenneth R. Diller (2015). Knee Surgery, Sports Traumatology, Arthroscopy

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Cold-induced vasoconstriction may persist long after cooling

What This Paper Is Actually Saying

Khoshnevis, Craik, and Diller set out to answer a deceptively simple question: when you stop applying cold, does your body's blood flow return to normal? The answer, documented across four different FDA-approved cryotherapy devices, is no. Not immediately. Not quickly. And in some cases, not for a considerable time even after the skin itself has rewarmed toward its baseline temperature.

That's the core claim, and it matters more than it might seem at first glance. Vasoconstriction — the narrowing of blood vessels — is the mechanism we rely on when we use cold therapeutically. It reduces swelling. It dampens inflammation. It slows the metabolic activity that drives tissue damage after an acute injury. But this paper demonstrates that once you've triggered that vasoconstriction, it can persist in a kind of autonomous state, independent of whether the cold is still present. The body gets stuck in the contracted position.

How This Fits the Broader Picture

The debate in sports medicine has long been about duration and frequency. Some practitioners advocate for continuous cold application for days or even weeks post-surgery. Others — backed by older protocols — recommend short cycles of 10 to 30 minutes followed by passive rewarming. What this research adds is a mechanism that hadn't been clearly quantified: even in the passive rewarming period, blood perfusion remained statistically flat across all four devices tested. The skin warmed. The blood didn't follow.

This connects to something we see throughout the contrast therapy literature. Cold and heat don't simply toggle vascular tone on and off like a switch. They initiate cascades. Sympathetic activation, catecholamine release, smooth muscle contraction in vessel walls — these are biological processes with their own momentum. Temperature initiates them, but temperature alone doesn't stop them. If you've worked with the research on thermoregulation, this finding fits a pattern: the body's vascular system is conservative. It doesn't rush to re-establish blood flow after a significant cold challenge.

Cold doesn't just cool tissue. It creates a physiological state that can persist long after the ice has been removed — and that state carries both therapeutic potential and genuine risk.

Where the Field Agrees and Diverges

There's broad consensus that cryotherapy is effective for acute soft tissue injury. The analgesic effect, the reduction in edema — well documented. Where practitioners diverge is on protocol design, and this paper lands squarely in that debate. The authors are making a case, implicitly, for interval-based protocols over continuous application. If vasoconstriction persists into the rewarming window, continuous cold stacks these effects, potentially extending ischemia to a point where tissue damage — nonfreezing cold injury — becomes a real risk. Not a hypothetical one.

The disagreement in the field isn't really about whether NFCI exists. It does. The disagreement is about how much margin practitioners have. This research narrows that margin.

The Practical Recommendation

If you're using cold therapeutically — ice pack, cold water immersion, or a powered cryotherapy unit — treat the passive rewarming period as still-active treatment. Don't immediately reapply. Don't assume that because your skin feels warmer, your tissue has recovered. A 10-to-30-minute cooling session may be followed by another 30 to 60 minutes of persistent vasoconstriction before blood flow genuinely normalizes. Build that into your protocol.

For contrast therapy specifically — where the heat phase is meant to drive vasodilation and flush metabolic byproducts — this finding suggests your cold-to-heat transition window matters. End the cold phase with enough time for passive vasoconstriction to begin resolving before heat exposure amplifies circulation. Rushing the transition doesn't necessarily give you the contrast effect you want.

The Surprising Connection

What strikes me most about this research isn't the clinical implication — it's what it reveals about the body's operating logic. We tend to think of temperature as the lever that controls vascular tone. Cold contracts, heat dilates, remove the stimulus and the system resets. But that's not what's happening here. The vasoconstriction, once established, becomes self-sustaining through mechanisms that don't require continued cold input. Smooth muscle tone, sympathetic drive, local signaling — they carry the state forward on their own momentum.

That same principle — biological states persisting beyond the stimulus that initiated them — appears across the physiology of cold exposure. A cold plunge elevates norepinephrine for hours after the session ends. Core temperature depression from cold water can affect sleep architecture later that night. The body doesn't simply respond and reset. It responds and carries something forward. Understanding that persistence is what separates a thoughtful protocol from an arbitrary one.

Cold-induced vasoconstriction may persist long after cooling

Understanding Cryotherapy: The Science of Cold and Its Lasting Effects

The Mechanism Behind Cryotherapy

What Does This Mean for Your Recovery?

Integrating This Knowledge Into Your Wellness Ritual

Key Takeaways

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