{"publication_id":"894750f0-2e4a-4214-9f4e-f641edf929ff","content_hash":"sha256:c171fc31978899e4d773ca7f272c2b248e2d3c8d27bbbc5ac190ccd630290fe2","nodes":[{"id":"894750f0-2e4a-4214-9f4e-f641edf929ff","type":"publication","title":"Cold Water Immersion: Performance and Strength Training Adaptation"},{"id":"claim_1","type":"claim","text":"Hypothesis-level alpha signal; not clinical advice. Alpha memo: Cold Water Immersion: Performance and Strength Training Adaptation  Core signal Receipt 10.1123/ijspp.2019 0965 reports a strength training randomized trial where post session cooling showed negative effects for muscle (g = 1.20; 95% CI, 0.65 to 1.20; significant condition × time, P = .01, F = 10.00), with non significant trends for 1RM and CMJ. Receipt 10.1007/s00421 025 05835 w reports that, compared to placebo, CWI and HWI \"do not improve post match recovery of physical performance and do not impact long term training adaptations in highly trained soccer players.\" Together these receipts describe a negative/null pattern for cold immersion outcomes on training relevant endpoints, with Receipt 1 as the strongest direct human signal."},{"id":"claim_2","type":"claim","text":"Receipt 10.1123/ijspp.2019-0965 reports a strength-training randomized trial where post-session cooling showed negative effects for muscle (g = 1.20; 95% CI, -0.65 to 1.20; significant condition × time, P = .01, F = 10.00), with non-significant trends for 1RM and CMJ. Receipt 10.1007/s00421-025-05835-w reports that, compared to placebo, CWI and HWI \"do not improve post-match recovery of physical performance and do not impact long-term training adaptations in highly trained soccer players.\" Together these receipts describe a negative/null pattern for cold immersion outcomes on training-relevant endpoints, with Receipt 1 as the strongest direct human signal."},{"id":"claim_3","type":"claim","text":"Receipt 1 measures a strength-training protocol with a post-exercise cooling contrast; Receipt 2 measures a soccer cohort across post-match recovery and long-term training. Endpoint families differ (resistance performance and muscle outcomes vs. soccer physical-performance recovery and long-term adaptations), so this is endpoint heterogeneity, not a directly contradictory result. Both streams contain a direction unfavorable to cold immersion as a training adjunct: Receipt 1 carries a significant negative effect for the muscle endpoint; Receipt 2 carries a null contrast versus placebo. Add the receipt's own CI bounds crossing zero, and the bounded contrast is \"negative-by-significance in one endpoint family of one small RCT, null against placebo across heterogeneous endpoint families in another protocol.\" Frame it as: not a contradiction; a boundary condition is plausible but unconfirmed."},{"id":"claim_4","type":"claim","text":"If subsequent evidence confirms that the negative muscle-direction signal in Receipt 1 is real and extends beyond one small RCT to broader resistance-trained populations, then regular cold immersion could quietly blunt muscle adaptation while leaving wider performance metrics statistically flat, undermining the rationale for routine post-training cold immersion. Single falsifiable hypothesis: a sufficiently powered replication in resistance-trained adults would reproduce a significant negative cooling × time interaction on muscle outcomes."},{"id":"claim_5","type":"claim","text":"10.1123/ijspp.2019-0965 - role=negative_signal; design=randomized_trial; population=human; outcome=performance; direction=negative; support=direct/high. Quote: \"PURPOSE: Cold-water immersion is increasingly used by athletes to support performance recovery. Recently, however, indications have emerged suggesting that the regular use of cold-\""},{"id":"claim_6","type":"claim","text":"10.1007/s00421-025-05835-w - role=null_signal; design=intervention_study; population=human; outcome=long/performance; direction=null; support=direct/high. Quote: \"Compared to a placebo, CWI and HWI do not improve post-match recovery of physical performance and do not impact long-term training adaptations in highly trained soccer players.\""},{"id":"claim_7","type":"claim","text":"10.12775/qs.2025.47.66734 - role=mechanism; design=synthesis; population=human; outcome=acute/context/damage; direction=negative/null/positive; support=indirect/medium. Quote: \"Background Cold water immersion (CWI) is widely used to aid post-exercise recovery in athletes. It can reduce soreness and accelerate readiness, but routine use may blunt hypertrop\""},{"id":"source_1","type":"source","study":"Does Cold-Water Immersion After Strength Training Attenuate Training Adaptation?","year":2020,"doi":"10.1123/ijspp.2019-0965","url":"https://doi.org/10.1123/ijspp.2019-0965","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary","excerpt":"PURPOSE: Cold-water immersion is increasingly used by athletes to support performance recovery. Recently, however, indications have emerged suggesting that the regular use of cold-water immersion might be detrimental to strength training adaptation. METHODS: In a randomized crossover design, 11 participants performed two 8-week training periods including 3 leg training sessions per week, separated by an 8-week \"wash out\" period. After each session, participants performed 10 minutes of either whole-body cold-water immersion (cooling) or passive sitting (control). Leg press 1-repetition maximum and countermovement jump performance were determined before (pre), after (post) and 3 weeks after (follow-up) both training periods. Before and after training periods, leg circumference and muscle thickness (vastus medialis) were measured. RESULTS: No significant effects were found for strength or jump performance. Comparing training adaptations (pre vs post), small and negligible negative effects of cooling were found for 1-repetition maximum (g = 0.42; 95% confidence interval [CI], -0.42 to 1.26) and countermovement jump (g = 0.02; 95% CI, -0.82 to 0.86). Comparing pre versus follow-up, moderate negative effects of cooling were found for 1-repetition maximum (g = 0.71; 95% CI, -0.30 to 1.72) and countermovement jump (g = 0.64; 95% CI, -0.36 to 1.64). A significant condition × time effect (P = .01, F = 10.00) and a large negative effect of cooling (g = 1.20; 95% CI, -0.65 to 1.20) were observed for muscle thickness. CONCLUSIONS: The present investigation suggests small negative effects of regular cooling on strength training adaptations."},{"id":"source_2","type":"source","study":"Cold- and hot-water immersion are not more effective than placebo for the recovery of physical performance and training adaptations in national level soccer players","year":2025,"doi":"10.1007/s00421-025-05835-w","url":"https://doi.org/10.1007/s00421-025-05835-w","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary","excerpt":"Compared to a placebo, CWI and HWI do not improve post-match recovery of physical performance and do not impact long-term training adaptations in highly trained soccer players."},{"id":"source_3","type":"source","study":"Cold Water Immersion After Training: Regeneration vs Adaptation — A Systematic Review","year":2025,"doi":"10.12775/qs.2025.47.66734","url":"https://doi.org/10.12775/qs.2025.47.66734","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary","excerpt":"Background Cold water immersion (CWI) is widely used to aid post-exercise recovery in athletes. It can reduce soreness and accelerate readiness, but routine use may blunt hypertrophic adaptations after resistance training. The effects on acute recovery, neuromuscular function and long-term adaptations remain debated. Aim This study reviews physiological and functional outcomes of post-exercise CWI, focusing on recovery and adaptation across training modalities. Materials and methods A systematic search in PubMed and Google Scholar identified studies on post-exercise CWI in healthy participants (2008–2023). Included studies were mechanistic, acute, longitudinal interventions and meta-analyses. Outcomes assessed were soreness, perceived recovery, neuromuscular performance, anabolic signaling and long-term adaptations in resistance and endurance training. Data extracted included participants, exercise type, CWI protocol (temperature, duration, site, timing), comparators and outcomes. Findings emphasized randomized trials and meta-analyses. Results Meta-analyses show that CWI reduces delayed-onset muscle soreness (DOMS) at 24–96 h and improves perceived recovery. Markers of muscle damage or inflammation are inconsistent. CWI aids short-term performance, especially with limited recovery or heat stress. In hypertrophy-focused resistance training, regular use may reduce muscle growth and type II fiber adaptations. In endurance training, effects are largely neutral. Responses vary according to sex, training status and context; protocol differences and expectancy effects add variability. Conclusions CWI should be used strategically: most useful for rapid recovery (e.g., tournaments, multiple sessions, heat stress), but avoided after hypertrophy-focused resistance training. In endurance phases, CWI is adaptation-neutral and may support day-to-day recovery."}],"edges":[{"from":"894750f0-2e4a-4214-9f4e-f641edf929ff","to":"claim_1","type":"contains_claim"},{"from":"894750f0-2e4a-4214-9f4e-f641edf929ff","to":"claim_2","type":"contains_claim"},{"from":"894750f0-2e4a-4214-9f4e-f641edf929ff","to":"claim_3","type":"contains_claim"},{"from":"894750f0-2e4a-4214-9f4e-f641edf929ff","to":"claim_4","type":"contains_claim"},{"from":"894750f0-2e4a-4214-9f4e-f641edf929ff","to":"claim_5","type":"contains_claim"},{"from":"894750f0-2e4a-4214-9f4e-f641edf929ff","to":"claim_6","type":"contains_claim"},{"from":"894750f0-2e4a-4214-9f4e-f641edf929ff","to":"claim_7","type":"contains_claim"}],"screening":{"identified":3,"screened":3,"excluded":0,"included":3,"included_or_retained":3,"flow":["identified","screened","excluded_with_reasons","included"],"wording":"3 candidate receipts retained after source retrieval, deduplication, and topic filtering. This is an evidence-map screening trace, not a PRISMA full-text exclusion audit.","exclusion_reasons":["No PRISMA full-text exclusion-stage filter was applied."]}}