Derivation Web

source_3b9fdcfa3a674130

# Alpha memo: cold water immersion training modality boundary
**One-sentence alpha:** Daily cold-water recovery during a 5-day heat-based block may increase training-load perception, while long-term CWI after sprint-interval cycling preserves fiber-type-specific Na⁺,K⁺-ATPase adaptation, together suggesting a modality/training-type boundary rather than a uniform response.
**Receipt 1:** "The Effec…