James Dunn

A treadmill test in the University of Brighton’s Environmental Chamber replicated the heat and humidity expected for England’s World Cup quarter-final match in Miami. Running at 9 km/h in 33°C and 73% humidity, James Dunn experienced rapid overheating, high heart rate and an inability to continue the full 30 minutes. Environmental extremes expert Neil Maxwell explained that high humidity limits cooling and makes decision-making harder for athletes, while hydration breaks offer limited physiological benefits. England will play Norway in Miami under similarly challenging conditions.