A football club leaping into an ice bath after a play-off match. A bodybuilder in the off-season sidestepping it like the plague. Both are right \u2013 and fresh research explains why.<\/p>\n\n\n\n
64 physically active participants, RCT, study by Gang et al., published in PLoS ONE in April 2026. All completed a fatiguing stretch-shortening cycle (SSC) protocol \u2013 repetitive plyometric jumps that heavily loaded the lower limb musculature.<\/p>\n\n\n\n
Then \u2013 randomisation into four groups:<\/p>\n\n\n\n
PCM (phase change material) is a material with a phase transition. Unlike ice, which melts quickly at 0\u00b0C and then heats up, PCM transitions from a solid to a liquid state at a specific temperature, maintaining a stable temperature for a long time. In other words, it's controlled-temperature cold therapy, not \u201cas cold as it gets.\u201d.<\/p>\n\n\n\n
Measurements: peak torque (PT), mean power, rate of force development (RFD), countermovement jump (CMJ), RPE, vastus lateralis and rectus femoris stiffness. Three time points: immediately after fatigue, immediately after cryo, 60 minutes after.<\/p>\n\n\n\n
Improvements<\/strong><\/p>\n\n\n\n It makes no difference<\/strong><\/p>\n\n\n\n So cryotherapy unloads function<\/strong> \u2014 the ability to generate force quickly, a feeling of lightness, the power of repeated movements. But Maximum strength<\/strong> and does not change the passive mechanical properties of the muscle.<\/p>\n\n\n\n Sports games.<\/strong> The footballer plays on Tuesday and Sunday. Between matches, it's important for his legs to \u201cfind\u201d their speed, rather than coming onto the pitch with a feeling of concrete quadriceps. Cryo provides exactly that \u2013 RFD and mean power are already at a working level after an hour. This is performance recovery.<\/p>\n\n\n\n Strength and hypertrophy.<\/strong> The logic here is the opposite. Inflammation after strength training is not a bug, it's a feature. It triggers signalling pathways (mTOR, satellite cells) which are precisely what build muscle. Cold suppresses inflammation, which suppresses the signal, reducing hypertrophic adaptation.<\/p>\n\n\n\n This is not a theory. Roberts et al. 2015 was a 12-week RCT on resistance training individuals: one group performed cold water immersion at 10\u00b0C for 10 minutes after each session, while the other group engaged in active recovery. After 12 weeks, the cold water group experienced the 32% showed a smaller increase in muscle mass<\/strong> \u0456 a smaller increase in force on the 17%<\/strong>. Further work by Fyfe (2019) and Petersen (2024) confirmed the mechanism via signalling.<\/p>\n\n\n\n Cryo is appropriate when:<\/strong><\/p>\n\n\n\n Cryotherapy is counterproductive when:<\/strong><\/p>\n\n\n\n Parameters from this study:<\/strong><\/p>\n\n\n\n PCM packs are available commercially, but they can be replaced by: ice packs + a towel, a container of cold water, or immersing feet in a bath. The principle is stable contact with coolness, not extreme cold.<\/p>\n\n\n\n Cryotherapy does not treat injury \u2013 it reduces pain sensation and functional fatigue. If something truly hurts a week later, ice won't help.<\/p>\n\n\n\n Cryotherapy does not replace sleep, nutrition, or appropriate training load. An athlete suffering from chronic sleep deprivation with a 1200 kcal deficit will not be saved by an ice bath.<\/p>\n\n\n\n Whole-body cryotherapy (chambers at \u2212110\u00b0C for 3 minutes) is a separate issue, with different effects, less evidence, and a broader risk. This study did not investigate it.<\/p>\n\n\n\n Cryotherapy is a performance tool, not an adaptation tool. In team sports and tournament formats, the benefit is clear. In hypertrophy cycles, it's directly harmful. The worst thing is to use it without understanding which phase you are in.<\/p>\n\n\n\n The simplest rule: If you need to be fast tomorrow, cryo yes. If you need to be stronger than today tomorrow, cryo no.<\/strong><\/p>\n\n\n\n\n
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Why are two schools right<\/h2>\n\n\n\n
How do I use this<\/h2>\n\n\n\n
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What does this not solve<\/h2>\n\n\n\n
Conclusion<\/h2>\n\n\n\n
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