Studies have shown that elite athletes such as tennis players can reach core temperatures as high as 40 degrees Celsius, associated with collapse from heat exhaustion.
Notes on verification
Corroborated by multiple independent sports-medicine sources (peer-reviewed reviews, UpToDate, ACSM position stand) confirming elite athletes including tennis players can reach core temps near or at 40°C, and that this range aligns with clinical definitions of heat exhaustion/heat stroke. Minor nuance that many athletes reach 40°C without symptoms doesn't contradict the claim's phrasing. [tier=gold indep_score=0.867 clusters=3 claim_tier=notable | framework convergence=partial on Clinical/sports-medicine consensus definitions of heat exhaustion and exertional heat stroke based on core body temperature thresholds (approximately 38.3-40°C for heat exhaustion, >40°C for heat stroke) (upstreams: American College of Sports Medicine (ACSM) position stand on exertional heat illness, Bergeron et al. field studies on tennis players' core temperature, UpToDate clinical reference on exertional heat illness) — publishers independent, evidence may not be | kind=empirical eligibility=high (extractor: attributed/medium)]
Sources
- Firefighters know how to look after themselves to prevent heat exhaustion - ABC News (seed:sports_and_combat)
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10588574/ (corroboration)
- https://pubmed.ncbi.nlm.nih.gov/17473783/ (corroboration)
- https://www.uptodate.com/contents/exertional-heat-illness-in-adolescents-and-adults-epidemiology-thermoregulation-risk-factors-and-diagnosis/print (corroboration)
- https://www.laykold.com/news/tennis-feels-the-heat (corroboration)
- https://pmc.ncbi.nlm.nih.gov/articles/PMC3017490 (corroboration)
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12152093/ (corroboration)