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# Alpha memo: cold water immersion training modality boundary **One-sentence alpha:** Receipts suggest cold-water immersion may show divergent training-context signals, with one finding a possible negative tolerance signal in heat-based training and the other reporting training-induced Na⁺,K⁺-ATPase isoform changes without a clean CWI-specific directional endpoint. **Receipt 1:** *The Effects of D…
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