A bit chilly in that there cold plunge

Ice baths are still a hot topic, but should you do them?

Cold plunges have gone from a recovery-room afterthought to a full lifestyle product, and I get the appeal — they feel incredible. But "does it help me recover" and "does it help me build muscle" are different questions, and the honest answer to the second one has shifted now the research has caught up with the trend.

Ice ice baby

What the research actually found

The clearest answer comes from a 2024 meta-analysis pooling eight resistance-training studies comparing lifters who did a cold water immersion straight after training to lifters who didn't [1]. Training alone produced the muscle growth you'd expect from a solid programme. Add a cold plunge right after each session, though, and the hypertrophy response shrank to what the researchers called "small to negligible." The likely mechanism: cold immersion dampens the same inflammatory and cell-signalling response your muscles use to kick off repair and growth — you're switching off part of the machinery you just spent an hour trying to switch on.

Strength doesn't escape either. A separate 2023 meta-analysis of 10 studies and 170 lifters found post-exercise cold water immersion modestly reduced strength gains overall [2]. How you did it mattered, though: dunking just your arms or legs blunted strength gains meaningfully, while full-body immersion showed no significant effect — a reminder that "cold water immersion" isn't one single intervention.

The case for cold water anyway

None of this means ice baths are pointless. A large 2022 review found cold water immersion genuinely reduces muscle soreness after hard training, especially high-intensity sessions, with the benefit showing up within an hour and still holding at 48 hours [3]. Got a competition, a brutal travel day, or you just want to feel less wrecked? That's a real, useful effect. It just isn't the same thing as building more muscle.

The caveats worth knowing

Most of these studies are small, short (weeks rather than years), and skew heavily toward young, recreationally trained men, so treat the exact numbers as directional rather than gospel. The hypertrophy-blunting effect was also described as "small" — real, but not catastrophic if you occasionally jump in after a session for other reasons. This is a "don't make it a habit right after your hardest lifting days" finding, not a "never touch cold water" one.

What I'd actually do about it:

• If building muscle or strength is the priority, skip the ice bath immediately after lifting — leave a gap of several hours, or do it on a separate day.

• Save cold plunges for what they're actually good for: bad soreness before an event, travel recovery, or the mental boost, not muscle growth.

• Want both on the same day? Train first, plunge much later (morning lift, evening plunge) rather than back-to-back.

• Don't sweat the odd cold shower or icy sea swim — the research is about consistent, repeated, immediate post-lifting use, not an occasional dip.

References

1. Piñero A, Burke R, Augustin F, et al. Throwing cold water on muscle growth: a systematic review with meta-analysis of the effects of post-exercise cold water immersion on resistance training-induced hypertrophy. European Journal of Sport Science. 2024;24(2):177-189.

2. Grgic J. Effects of post-exercise cold-water immersion on resistance training-induced gains in muscular strength: a meta-analysis. European Journal of Sport Science. 2023;23(3).

3. Moore E, Fuller JT, Buckley JD, et al. 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. Sports Medicine. 2022;52(7):1667-1688.