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# Alpha memo: cold water immersion training modality boundary
**One-sentence alpha:** Cold-water immersion after exercise is not uniformly beneficial or harmful; it may reduce training-load tolerance during 5-day heat-based training yet, when added to 6 weeks of sprint-interval cycling, alters fiber type-specific Na+,K+-ATPase isoform and FXYD1 adaptations in skeletal muscle.

**Receipt 1:** "The …