Cold-water immersion (ice baths)
An ice bath after a hard session reduces soreness and helps power and perceived recovery come back by the next day. But used regularly after lifting, it blunts muscle growth and strength gains. Save it for when next-day performance matters more than long-term adaptation, and skip it after strength training if you want to grow.
What the science says
- Faster short-term recovery after a hard session Moderate evidence
A meta-analysis of 52 studies (Moore et al., 2022) found cold-water immersion improved recovery of muscular power at 24 h, reduced muscle soreness and improved perceived recovery after high-intensity exercise, but did not help strength recover.
- Regular use after lifting blunts muscle growth Moderate evidence
In Roberts et al. (2015), 21 men trained for 12 weeks with 10 min of cold-water immersion or active recovery after each session; muscle mass and strength rose more with active recovery, and type II fiber size (+17%) grew only in that group. Fyfe et al. (2019) found 15 min at 10 °C after each session for 7 weeks blunted type II fiber growth.
- It can also blunt strength gains Moderate evidence
A meta-analysis of 8 studies (Malta et al., 2021) found regular cold-water immersion during resistance training reduced gains in 1RM, isometric strength, strength endurance and ballistic performance. It did not affect gains from endurance training.
How to apply it
Use it when you need to perform again soon, not as a routine after every workout, and keep it away from strength sessions if muscle or strength is the goal.
Who should be careful
Sudden immersion in cold water causes a cold-shock response with rapid breathing and a jump in heart rate and blood pressure. Do not do it alone, enter gradually and keep your head out of the water. People with heart disease, high blood pressure, Raynaud's phenomenon or cold sensitivity, or who are pregnant, should talk to a physician first.
Frequently asked questions
Do ice baths hurt muscle gains?
Yes, when used regularly after lifting. Two training studies found cold-water immersion blunted muscle fiber growth, and a meta-analysis found it reduced strength gains.
Then when is an ice bath useful?
When next-day performance matters, such as competitions or back-to-back hard sessions: it improved power, soreness and perceived recovery at 24 h.
How cold and how long?
About 10–15 °C for about 10–15 min, the ranges used in the studies.
Scientific references
- Post-exercise cold water immersion attenuates acute anabolic signalling and long-term adaptations in muscle to strength training
- Cold water immersion attenuates anabolic signaling and skeletal muscle fiber hypertrophy, but not strength gain, following whole-body resistance training
- The Effects of Regular Cold-Water Immersion Use on Training-Induced Changes in Strength and Endurance Performance: A Systematic Review with Meta-Analysis
- Impact of Cold-Water Immersion Compared with Passive Recovery Following a Single Bout of Strenuous Exercise on Athletic Performance in Physically Active Participants: A Systematic Review with Meta-analysis and Meta-regression
More training methods
- Drop sets Moderate evidence
A drop set takes a set to failure, then immediately cuts the load and keeps going.
- Rest-pause sets (including myo-reps) Limited evidence
Rest-pause means taking a set close to failure, resting 15–30 seconds, then squeezing out a few more reps, repeated a few times.
- Supersets Moderate evidence
A superset pairs two exercises back to back with little or no rest.
- High-intensity interval training (HIIT) Strong evidence
HIIT alternates short hard efforts with recovery.
- Zone 2 training Limited evidence
Easy, steady cardio clearly improves fitness and health, but the popular claim that "Zone 2" is a special, optimal intensity for building mitochondria and burning fat is not supported.
- Fasted training (fasted cardio) Limited evidence
Training on an empty stomach burns more fat during the session, but that does not translate into more fat lost over weeks.