Cryotherapy, Red Light and Compression: What the Science Says

Cryotherapy chambers, red light therapy and compression boots have become fixtures of modern recovery. So what does the evidence actually show? The honest answer is nuanced — and worth understanding before you build any of them into your routine.

Cryotherapy: real relief, mixed on the mechanics

The clearest, most consistent finding is that cold helps sore muscles feel better. A Cochrane review of 17 trials found some evidence that cold-water immersion reduces delayed-onset muscle soreness compared with rest, with meaningful reductions in perceived soreness at 24, 48 and 72 hours — while cautioning that the studies were small and of modest quality.¹ A separate meta-analysis found that cooling significantly reduced subjective soreness but showed no significant effect on objective markers of recovery in the blood.²

In other words: cold reliably makes you feel more recovered, even where it doesn't clearly change the underlying biology. That perception still has value — feeling less sore can mean better sleep, better mood and more willingness to train again. Newer work adds nuance: a 2026 network meta-analysis found effects depend on the method and timing, with whole-body cryotherapy showing some benefit for certain recovery markers and performance at specific time points.³

Red light: promising, but dose and timing matter

Red and near-infrared light used for recovery is usually studied under the name photobiomodulation. A 2024 meta-analysis of 34 randomized trials found small improvements in muscle endurance and recovery of strength, along with lower creatine kinase levels, when light was applied before exercise.⁴ But the results were not uniform: benefits differed by activity level, and the researchers found no significant benefit in the subgroup they classified as physically active.

That variability matters. Wavelength, dose, distance from the light, treatment area and timing can all change the result, so findings from a research protocol do not automatically transfer to every commercial red-light device. The evidence is encouraging enough to consider red light a promising recovery option, but not strong enough to describe it as guaranteed.

Compression: comfortable, with modest evidence

Pneumatic compression — the boots that squeeze your legs in waves — is popular for good reason: it's relaxing and pleasant. The performance evidence is modest and mixed. One randomized trial found intermittent compression did not meaningfully reduce soreness, strength loss or muscle-damage markers versus a placebo.⁵ A 2025 trial similarly concluded that compression may modestly reduce perceived soreness but did not improve neuromuscular function after muscle-damaging exercise.⁶

The recurring theme across both tools is the same: they're most reliable at helping you feel better, less reliable at measurably speeding the deep physiology of recovery. For many people, that comfort — the reduced ache, the forced few minutes of rest — is genuinely useful on an off day.

How to use them well

Think of cryotherapy, red light and compression as optional tools, not magic. Pair them with the fundamentals that carry the strongest evidence — sleep, adequate protein, hydration and easy movement — and pay attention to how you respond. One nuance worth knowing: routinely using intense cold immediately after strength training may slightly blunt muscle adaptation, so many people save cold for rest days rather than right after lifting.

At mActivity, cryotherapy, red light and compression are available as recovery add-ons, so you can decide which options fit your routine. Explore our recovery services or visit free for two days.

This article is for general information and is not medical advice. Research on these topics is ongoing; results vary from person to person. Talk with a qualified professional before starting a new exercise or recovery routine.