Post-Exercise Cold Water Immersion Attenuates Acute Anabolic Signalling and Long-Term Adaptations in Muscle to Strength Training
Technology context Cold-water immersion at 10°C immediately after resistance training
Finding: Over 12 weeks of strength training, cold-water immersion after each session produced smaller gains in strength and muscle mass than active recovery, with type II fibre area rising 17% and myonuclei 26% in the active recovery group only.
Main limitation: Small samples of physically active young men, testing immersion immediately after resistance training - it says nothing about cold used at other times or for other purposes.
Executive summary
This is the study that changed the practical advice about when to use a cold plunge, and it is the reason a serious advisor will ask what you train for before recommending one.
The researchers ran two linked investigations. In the first, 21 physically active men strength trained for 12 weeks, twice a week, with either 10 minutes of cold-water immersion or active recovery after every session. In the second, nine active men performed single-leg strength exercises followed by cold immersion or active recovery, with muscle biopsies collected before and at 2, 24 and 48 hours after exercise.
Strength and muscle mass increased more in the active recovery group than in the cold immersion group (p<0.05). Isokinetic work rose 19%, type II muscle fibre cross-sectional area 17%, and the number of myonuclei per fibre 26% in the active recovery group - and none of these increased significantly in the cold immersion group.
The biopsy study supplied a mechanism. Satellite cell numbers expressing NCAM and Pax7 increased substantially 24-48 hours after exercise with active recovery, and were significantly greater than after cold immersion. Phosphorylation of p70S6 kinase, a signalling step in muscle protein synthesis, increased after exercise in both conditions but was greater after active recovery.
The authors' conclusion is unusually direct for a physiology paper: the use of cold-water immersion as a regular post-exercise recovery strategy should be reconsidered.
Why this research matters
Cold immersion is widely sold on recovery benefits. This trial demonstrates that for one specific and common goal - building strength and muscle - routine use immediately after training works against you.
It is also a rare example in this field of a randomised trial with both a functional endpoint measured over months and a cellular mechanism measured in the same programme. That combination makes it much harder to dismiss than a single-session study.
Study design
- Study type
- Two linked studies: a 12-week randomised training trial and an acute biopsy study
- Participants (training study)
- 21 physically active men
- Participants (biopsy study)
- 9 active men
- Sex
- Men only
- Intervention
- 10 minutes of cold-water immersion after each training session
- Comparator
- Active recovery of matched duration
- Training protocol
- Strength training twice per week for 12 weeks
- Biopsy timepoints
- Before exercise and at 2, 24 and 48 hours after
- Primary outcomes
- Muscle strength, muscle mass, type II fibre cross-sectional area, myonuclei per fibre
- Mechanistic outcomes
- NCAM+ and Pax7+ satellite cell numbers; p70S6 kinase phosphorylation (Thr421/Ser424)
- Water temperature and immersion depth
- Not reported in the source abstract
- Follow-up beyond 12 weeks
- None
What the researchers found
Functional outcomes over 12 weeks. Strength and muscle mass increased more in the active recovery group than in the cold-water immersion group (p<0.05).
Measured gains in the active recovery group only (all p<0.05): isokinetic work +19%; type II muscle fibre cross-sectional area +17%; myonuclei per fibre +26%. These increases were not observed in the cold immersion group.
Satellite cells. NCAM-expressing satellite cells increased 10-30% and Pax7-expressing cells 20-50% at 24-48 hours after exercise with active recovery. NCAM+ satellite cells increased at 48 hours with cold immersion. Both NCAM+ and Pax7+ counts were significantly greater after active recovery than after cold immersion (p<0.05).
Anabolic signalling. p70S6 kinase phosphorylation increased after exercise in both conditions but was greater after active recovery (p<0.05).
What the results mean
The functional result and the cellular result point the same way, which is what makes this convincing. Cold immersion immediately after resistance exercise appears to interfere with the signalling cascade that turns a training session into adaptation, and over 12 weeks that translated into measurably smaller gains.
What is reasonably supported: if your goal is to gain strength or muscle, do not plunge immediately after lifting.
What this does not say is that cold immersion is useless or harmful generally. It tested one timing, in one type of training, for one set of goals. Cold used on rest days, hours after training, or for reasons unrelated to hypertrophy is simply not addressed by this trial.
What this study does not prove
- It does not show that cold-water immersion is harmful. It shows that this timing interferes with one specific adaptation.
- It does not apply to cold immersion used at other times of day, on non-training days, or away from resistance sessions.
- It does not apply to endurance training, competition recovery, or general wellbeing goals.
- It does not generalise to women, older adults, or untrained populations; participants were physically active young men.
- It does not establish a dose threshold. Only one immersion protocol was tested, and water temperature is not reported in the source abstract.
- With 21 and 9 participants, it cannot rule out that the true effect is smaller or larger than measured.
- It does not test whether the effect persists beyond 12 weeks.
Evidence strength
Randomised controlled trial
A randomised controlled trial assigns participants to conditions by chance, which removes the self-selection problem that limits observational research. It is the strongest design for establishing that an intervention causes an outcome.
This work pairs a 12-week training trial with a separate acute study using muscle biopsies, so it reports both the long-term functional result and a plausible cellular mechanism. That combination is unusually strong for this field. The samples are small, which limits precision rather than validity.
Strengths and limitations
Strengths
- Randomised design with an active comparator rather than passive rest, which is a harder test.
- Twelve-week duration, long enough for genuine training adaptation to occur.
- Objective outcomes: isokinetic work, fibre cross-sectional area, myonuclei counts.
- Muscle biopsy analysis supplying a plausible mechanism alongside the functional result.
- Two complementary study designs reported together.
- Consistency between the acute cellular findings and the long-term functional findings.
Limitations
- Small samples: 21 and 9 participants.
- Men only, and all physically active.
- Single immersion protocol; water temperature and depth not reported in the source abstract.
- Tested immediately post-exercise only, so timing effects cannot be mapped.
- Cannot be blinded - participants know whether they are in cold water.
- Twelve weeks is long for a trial but short relative to a training career.
- Findings have not been replicated at scale.
Does this apply to the equipment IMPERVITA sells?
The exposure - 10 minutes of cold-water immersion - is exactly what a plunge system delivers, so this applies directly to the equipment.
It is one of the few entries in this library where the research changes a purchasing conversation rather than just qualifying a claim. If you are buying a plunge primarily to support resistance training, this trial says the way you were probably planning to use it is counterproductive.
It does not argue against owning one. It argues for scheduling it away from lifting sessions.
Evidence in context
The finding has held up. A 2021 review concluded that chronic cryotherapy use during resistance training blunts the anabolic training effect, and recommended cold be reserved for situations where rapid recovery between bouts is required rather than after routine training. That is independent agreement on the practical conclusion.
It coexists with evidence that cold immersion does reduce perceived soreness - the 2012 Cochrane review found consistent effects against passive recovery. Both can be true: cold can make you feel better and still interfere with adaptation. That is precisely why timing rather than efficacy is the right frame.
The 2025 meta-analysis in healthy adults examined stress, sleep and wellbeing rather than training adaptation, and does not contradict this trial.
Related research
- The cold truth: the role of cryotherapy in the treatment of injury and recovery from exercise Independently reaches the same practical conclusion about chronic cryotherapy during resistance training, and proposes when cold is still indicated.
- Cold-water immersion (cryotherapy) for preventing and treating muscle soreness after exercise The Cochrane soreness review - the counterweight showing cold does reduce perceived soreness.
- An evidence-based approach for choosing post-exercise recovery techniques to reduce markers of muscle damage, soreness, fatigue, and inflammation Compares cold against other recovery methods, useful when deciding what to do instead after lifting.
- Effects of cold-water immersion on health and wellbeing: a systematic review and meta-analysis Examines general wellbeing outcomes rather than training adaptation.
Practical buyer relevance
This is the entry that should shape how you use a plunge, not whether you buy one.
If strength or muscle growth is a goal, schedule cold immersion away from resistance sessions - a different time of day, or a non-lifting day. If your goals are stress, sleep, or simply the way it makes you feel, this trial does not apply to you.
For equipment selection it has one practical implication. Using a plunge on a schedule separated from training means using it more often and more casually, which puts weight on convenience specifications: how quickly the water returns to temperature, how little maintenance it needs, and where it sits. A plunge you use four times a week on rest days is a different purchase from one you use twice a week after training.
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
- Post-Exercise Cold Water Immersion Attenuates Acute Anabolic Signalling and Long-Term Adaptations in Muscle to Strength Training
- Authors
- Roberts LA, Raastad T, Markworth JF, et al.
- Organization
- University of Queensland
- Publication
- The Journal of Physiology
- Year
- 2015
- Volume / issue / pages
- Volume 593, issue 18, pages 4285-4301
- PMID
- 26174323
- PMCID
- PMC4594298
- Study type
- Randomised controlled trial with muscle biopsy analysis (two linked studies)
- Sample size
- 21 men (12-week training study) and 9 men (acute biopsy study)
- Population
- Physically active young men
- Topic
- Cold Therapy, Performance, Recovery
- Document type
- Randomized controlled trial
- Technology context
- Cold-water immersion at 10°C immediately after resistance training
- Related equipment context
- Cold Plunge Systems
- Source last verified
- 19 August 2026
References
- Post-exercise cold water immersion attenuates acute anabolic signalling and long-term adaptations in muscle to strength training
- The cold truth: the role of cryotherapy in the treatment of injury and recovery from exercise
- Cold-water immersion (cryotherapy) for preventing and treating muscle soreness after exercise
- An evidence-based approach for choosing post-exercise recovery techniques to reduce markers of muscle damage, soreness, fatigue, and inflammation
- Effects of cold-water immersion on health and wellbeing: 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.
