- A smartwatch study found that a major cup final triggered big spikes in stress and heart rate in dedicated football fans, with levels rising the night before kick-off.
- The strongest physiological surges happened around key match moments and were higher for people watching in the stadium than on TV or in public venues.
- The research suggests that high-stakes sport can produce measurable stress responses, especially in tightly bonded crowds.
For many people, football is not just entertainment – it is identity, routine, and emotion packed into 90 minutes.
When the stakes are high, the body can react as if something personally important is on the line. A new study tracked this effect in the run-up to a historic German cup final and found that fans’ physiology ramped up well before the first whistle.
Researchers followed supporters of Arminia Bielefeld for 12 weeks leading up to the 2025 DFB-Pokal final. The match was a big deal: the tournament is a national knockout competition, culminating in a final at Berlin’s Olympiastadion watched by millions in person and on television.
That year, Arminia Bielefeld – a third-division club – reached the final against VfB Stuttgart, a strong favourite.
To understand what “football fever” looks like in real life, the team combined survey responses with high-resolution smartwatch data.
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Fans reported how strongly they identified with the club and whether they attended matches, travelled early, or watched the final in the stadium, on television, or in a public setting.
The wearable data focused on heart rate and a smartwatch-derived “stress” score on a 0-100 scale.
Even on ordinary days, stress levels had a pattern: on weekdays they began rising around 6 am, while on weekends they tended to climb later, after 8 am. Saturdays were already relatively high-stress evenings compared with weeknights, possibly reflecting higher activity and social plans. But the cup-final Saturday was different.
On the day of the final, average stress levels were markedly higher than typical days, rising by around 41% compared with a normal baseline. Stress did not simply spike at kick-off – it began building the night before, peaked just before the match started, and stayed elevated after the final whistle. During the match window, roughly 8-10 pm, the average stress level was around 43% higher than on a regular Saturday night.
Heart rate followed the drama too. Fans’ heart rates were high early in the match, then eased as play settled, rose briefly around the break, and dropped again.
Later in the game, when the underdog produced late goals, heart rates jumped sharply – even though the overall chances of victory remained heavily tilted towards the favourites. In other words, fans’ bodies seemed to mirror perceived excitement rather than cold, statistical odds.
Where and how fans watched also mattered. Average heart rates were highest for people inside the stadium.
Those watching on television or in public gatherings showed lower average values. The gap widened at big moments, including late goals, when the in-stadium group showed the largest surge.
Alcohol use was linked with higher heart rates too, with the difference becoming more noticeable in the second half and after major match events.
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Travel and build-up rituals appeared to play a role as well. Fans who arrived a day earlier showed higher stress levels late on the Friday night, and their stress began climbing again earlier on Saturday morning compared with those arriving on match day.
That fits with the idea that anticipation, logistics, crowds, and pre-match rituals can all add load before the game even begins.
The researchers were cautious about what the numbers can and cannot prove.
Smartwatch measures are indirect and do not replace clinical stress markers such as cortisol.
Emotional engagement was self-reported, and the number of stadium attendees in the detailed follow-up was small, so results should not be treated as universal for all supporters.
Still, the overall picture is clear: a high-stakes final can push devoted fans into a measurable state of physiological arousal, especially when watching in a tightly connected crowd.
For people living with diabetes, high blood pressure, or heart disease, that is a useful reminder that intense emotional stress can be a real physical event – and that planning ahead (medication, hydration, pacing alcohol, and taking breaks) may matter as much as what happens on the pitch.
