WASHINGTON — A new study has found that rising global temperatures are increasingly linked to reduced performance among athletes in endurance and high-intensity sports, with climate change amplifying heat stress during competitions.
Researchers at Climate Central analyzed data for the upcoming 2026 FIFA World Cup and determined that climate change has raised the likelihood of performance-impairing heat — defined as temperatures exceeding 82.4°F (28°C) — for 97 of 104 scheduled matches. The study, released earlier this month, highlights how warmer conditions can slow players and increase health risks.
The analysis examined historical weather patterns and projections, showing that elevated temperatures reduce distance covered, sprint frequency and overall game speed in soccer. Similar effects have been documented in other endurance events, where heat impairs cardiovascular efficiency and increases dehydration risks.
“Climate change is increasing the risk of slower games and reduced player performance at nearly every 2026 World Cup match,” the report stated. Organizers and medical teams are expected to implement mitigation measures such as cooling protocols and schedule adjustments.
Broader research has shown that temperatures above about 28°C can measurably degrade athletic output in sports requiring sustained effort. Heat stress affects thermoregulation, leading to higher heart rates and reduced aerobic capacity even among well-trained competitors.
Athletes and governing bodies have responded with strategies including heat acclimatization training, hydration protocols and modified competition timings. However, challenges persist for outdoor events held in summer months or tropical locations.
The findings align with concerns raised ahead of major tournaments, including the 2026 World Cup co-hosted by the United States, Mexico and Canada. Experts note that extreme heat not only affects performance but also elevates the risk of heat-related illnesses.
Sports organizations have emphasized the need for adaptive measures while some researchers point to potential benefits of acclimatization programs in certain conditions. Details of long-term impacts on training regimens and event planning continue to be studied.
As of June 11, 2026, the study’s recommendations are under review by international sports federations. Further research is anticipated on tailored interventions for different athletic disciplines as global temperatures rise.
