World Cup Fever Study tracks how football viewing stress impacts fan’s bodies
Crowds rise, voices sharpen, and a match can turn on a single kick. Now a team at Bielefeld University wants to know exactly what those moments do to the body. Its Football Fever Study, launched for the 2026 FIFA World Cup, is recruiting supporters of all national teams to track how match events affect heart rate and stress levels. The project uses smartwatch data to follow what happens during games, then compares those bodily changes with what is unfolding on the pitch. The appeal is broad by design. Anyone using a device from one of 13 supported brands can take part. The study records heart rate, stress, movement and sleep automatically through the watch, and the researchers say the data are collected anonymously and in line with data protection rules. That reach has widened quickly. When the study opened on 28 May, only Garmin devices were compatible. Since then, the team has added 12 more brands: Apple Watch, Google Pixel Watch, Samsung Health, Withings, Fitbit, Oura, Polar, Amazfit, Coros, Whoop, Xiaomi Mi Fitness and Wahoo. …

