The Cold Truth: The Role of Cryotherapy in the Treatment of Injury and Recovery From Exercise
Technology context Cryotherapy: ice, cold-water immersion, whole-body cryotherapy and phase change material
Finding: The primary demonstrated benefit of traditional cryotherapy in humans is reduced pain after injury or soreness after exercise; reductions in metabolism, inflammation and tissue damage are shown in animal models but comparable human evidence is lacking.
Main limitation: Narrative rather than systematic, and the authors attribute the missing human evidence to inadequate duration of cooling rather than to an absent effect - an interpretation, not a finding.
Executive summary
This review is the most useful entry in the library for understanding when cold is worth using, as distinct from whether it works.
The authors distinguish traditional cryotherapy - ice for musculoskeletal injury, cold-water immersion or whole-body cryotherapy for exercise recovery - from newer approaches using phase change material at 15°C applied for three to six hours.
Their central observation is that in humans the primary demonstrated benefit of traditional cryotherapy is reduced pain following injury or soreness following exercise. Reductions in metabolism, inflammation and tissue damage have been demonstrated in animal models of muscle injury, but comparable evidence in humans is lacking. The authors attribute this absence to the inadequate duration of application of traditional cryotherapy modalities - a brief plunge simply does not keep muscle temperature down long enough.
They also note that evidence suggests chronic cryotherapy use during resistance training blunts the anabolic training effect, while recovery using phase change material does not appear to compromise acute adaptation.
Their practical conclusion is precise: following exercise, cryotherapy is indicated when rapid recovery is required between exercise bouts, as opposed to after routine training. And for injury, it is imperative that cooling be applied in abundance within the first few hours of structural damage.
Why this research matters
Most discussion of cold treats all cold as interchangeable. This review separates three distinct questions - acute injury, rapid turnaround between bouts, and routine post-training recovery - and gives a different answer to each.
It also supplies a mechanistic reason why brief cold immersion may produce pain relief without producing the tissue-level effects seen in animal studies: duration. That is directly relevant to how a plunge gets used.
Study design
- Study type
- Narrative review
- Scope
- Cryotherapy in the treatment of musculoskeletal injury and in recovery from exercise
- Modalities covered
- Ice application, cold-water immersion, whole-body cryotherapy, phase change material at 15°C
- Evidence sources
- Human studies and animal models of muscle injury
- Phase change material protocol discussed
- 15°C applied for 3-6 hours
- Outcomes discussed
- Pain, soreness, muscle temperature, metabolism, inflammation, tissue damage, training adaptation
- Sample size
- Not applicable
- Systematic search protocol
- Not reported in the source
- Risk-of-bias assessment
- Not reported in the source
What the researchers found
In humans, the primary benefit of traditional cryotherapy is reduced pain following injury or soreness following exercise.
Cryotherapy-induced reductions in metabolism, inflammation and tissue damage have been demonstrated in animal models of muscle injury. Comparable evidence in humans is lacking, which the authors attribute to inadequate duration of application of traditional modalities. Traditional cryotherapy application must be repeated to overcome this limitation.
Cooling with 15°C phase change material administered for three to six hours has been used with reported success following exercise.
Evidence suggests chronic cryotherapy use during resistance training blunts the anabolic training effect, whereas recovery using phase change material does not compromise acute adaptation.
No pooled effect sizes, confidence intervals or p-values are generated by this review, and none are reproduced here.
What the results mean
The distinction that matters is between feeling better and healing faster. This review supports the first in humans and finds the second demonstrated mainly in animals.
The duration argument reframes what a plunge session is. A five-minute immersion produces a sharp sensory effect and a modest, brief reduction in deep muscle temperature. The tissue-level effects observed in animal models followed sustained cooling. If the authors are right, most domestic plunge use is delivering analgesia rather than altering tissue outcomes - which is a legitimate thing to buy, honestly described.
The timing conclusion is the actionable one: cold is indicated between bouts when you need to perform again soon, and after acute injury within the first few hours, but not as a reflex after every training session.
What this study does not prove
- It does not establish that cryotherapy reduces inflammation or tissue damage in humans; that evidence comes from animal models.
- It does not prove the duration hypothesis. That cooling is too brief is the authors' interpretation of why human evidence is lacking, not a demonstrated finding.
- It does not establish that phase change material is superior to cold immersion; it reports its use with success, not a head-to-head result.
- It is not a systematic review; no protocol or bias assessment is reported.
- It does not quantify effects, so no effect size can be cited from it.
- Animal model findings do not transfer directly to human tissue outcomes.
Evidence strength
Narrative review
A narrative review by clinicians working in sports medicine. It synthesises across human and animal literature and advances an argument about mechanism rather than pooling data.
Its interpretation - that human evidence for reduced inflammation is missing because cooling is not applied long enough - is a hypothesis the review makes explicit. It is plausible and testable, and it is not itself a demonstrated result.
Strengths and limitations
Strengths
- Written by clinicians with direct sports-medicine experience.
- Distinguishes clearly between acute injury, between-bout recovery, and routine training recovery.
- Explicit about which findings come from animal models and which from humans.
- Offers a testable mechanistic explanation for the human-animal discrepancy.
- Reaches specific, practical, appropriately narrow conclusions about indication and timing.
Limitations
- Narrative design; study selection was not pre-registered.
- No pooled data or effect estimates.
- The central duration hypothesis is an interpretation and remains unproven.
- Reliance on animal models for the tissue-level claims.
- Phase change material protocols of 3-6 hours are impractical for most domestic users, so the most promising modality discussed is not what a plunge delivers.
Does this apply to the equipment IMPERVITA sells?
Directly relevant, and mildly awkward for the category. The modality this review is most positive about - 15°C phase change material applied for three to six hours - is not a plunge. It is a wearable cooling system.
For a plunge specifically, the review supports pain and soreness relief, questions whether brief immersion achieves tissue-level effects, and cautions against routine use immediately after resistance training.
The temperature is worth noting too: 15°C is at the warm end of the range most plunges are set to, and is the threshold used as an inclusion criterion in the cold-immersion literature generally. Colder is not automatically better, and this review offers no support for chasing the lowest achievable temperature.
Evidence in context
The blunting of resistance-training adaptation reported here is consistent with the 2015 randomised trial that measured it directly with muscle biopsies over 12 weeks. Two independent sources reaching the same practical conclusion is meaningful agreement.
The pain and soreness conclusions align with the 2012 Cochrane review, which found consistent effects against passive recovery but none against warm-water or contrast immersion - itself compatible with the idea that immersion rather than cold specifically is doing much of the work.
The 2025 meta-analysis in healthy adults found an acute inflammatory rise rather than a fall, which sits alongside this review's finding that human anti-inflammatory evidence is lacking.
Related research
- Post-exercise cold water immersion attenuates acute anabolic signalling and long-term adaptations in muscle to strength training Measured the blunted training adaptation directly, with biopsies, over 12 weeks.
- Cold-water immersion (cryotherapy) for preventing and treating muscle soreness after exercise The Cochrane review on soreness, including the comparisons against warm-water and contrast immersion.
- Effects of cold-water immersion on health and wellbeing: a systematic review and meta-analysis Found an acute inflammatory increase in healthy adults, consistent with the absence of human anti-inflammatory evidence noted here.
- Contrast water therapy and exercise induced muscle damage: a systematic review and meta-analysis The contrast therapy meta-analysis, relevant to the between-bout recovery question.
Practical buyer relevance
Three practical points come out of this review.
First, colder is not better. The most promising protocol discussed here uses 15°C - a temperature most chillers reach easily. A system marketed on reaching 3°C is selling a specification this literature gives you no reason to want.
Second, if you need to train or compete again within hours, cold immersion has a defensible role. If you are training normally and recovering overnight, this review does not support using it after every session.
Third, be clear with yourself about what you are buying. Pain and soreness relief is the effect supported in humans, and it is a perfectly good reason to own a plunge. Tissue-level healing is not established, and equipment sold on that basis is ahead of the evidence.
Safety context
Cold-water immersion carries genuine physiological risk. Sudden immersion triggers the cold shock response - an involuntary gasp, hyperventilation, and a sharp rise in cardiac load - which is the mechanism behind cold-water drowning and is documented in the review by Tipton and colleagues listed in this library.
People with cardiovascular disease, high blood pressure, a heart rhythm disorder, Raynaud phenomenon, or cold urticaria, and people who are pregnant, may require guidance from a qualified healthcare professional before using cold immersion. Never plunge alone, and never after drinking alcohol.
Full source record
- Title
- The Cold Truth: The Role of Cryotherapy in the Treatment of Injury and Recovery From Exercise
- Authors
- Kwiecien SY, McHugh MP
- Organization
- Nicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital
- Publication
- European Journal of Applied Physiology
- Year
- 2021
- Volume / issue / pages
- Volume 121, issue 8, pages 2125-2142
- PMID
- 33877402
- Study type
- Narrative review
- Sample size
- Not applicable - narrative review
- Population
- Humans and animal models of muscle injury
- Topic
- Cold Therapy, Performance, Recovery
- Document type
- Narrative review
- Technology context
- Cryotherapy: ice, cold-water immersion, whole-body cryotherapy and phase change material
- Related equipment context
- Cold Plunge Systems
- Source last verified
- 19 August 2026
References
- The cold truth: the role of cryotherapy in the treatment of injury and recovery from exercise
- Post-exercise cold water immersion attenuates acute anabolic signalling and long-term adaptations in muscle to strength training
- Cold-water immersion (cryotherapy) for preventing and treating muscle soreness after exercise
- Effects of cold-water immersion on health and wellbeing: a systematic review and meta-analysis
- Contrast water therapy and exercise induced muscle damage: a systematic review and meta-analysis
Information provided by IMPERVITA is for educational and general wellness purposes and is not intended to replace professional medical advice, diagnosis, or treatment.
