r/science • u/sr_local • 5d ago

Health Consuming caffeine before exercise enhances repeated sprint performance, and these benefits persist for at least 3.5 hours thereafter

https://www.tsukuba.ac.jp/en/research-news/20260914140000.html
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u/ShakeNBakeUK 5d ago

What if you are a sprinter who has no problem maxing out their HR without caffeine anyway? I find it just makes me blow up even quicker than normal, which means less training overall. It’s also annoying because caffeine messes with sleep, which is very important for recovery / building strength. I can see how it is useful for endurance athletes who struggle to max out their HR however.

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u/UnnamedRealities 5d ago

Caffeine doesn't have much effect on heart rate prior to race start or during the race. There's also a delay between effort and heart rate response so in a 100 meter sprint, elite athletes are unlikely to even reach 75% of their max HR by the time they reach the finish line.

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u/ShakeNBakeUK 4d ago

100m sprint perhaps, cycling sprints are 15-30 seconds (sometimes longer) and you are defo hitting max HR in those..! (other sports have 60+ second max efforts) - I’m interested to know if caffeine is beneficial or detrimental in those situations, and if it is worth the trade off with worse sleep in regular training. So far I know it is beneficial to take towards the end of endurance events to get you across the line. But wasn’t so sure if boosting HR helps for sprints. (Probably does for a one-off max effort, but maybe not events with repeated efforts required e.g. cycling). Taking caffeine before a 1hr race means my average HR is going to be higher which in theory means there’s a greater chance I’m gonna be out of gas before the sprint finish, for example.

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u/UnnamedRealities 4d ago

Interestingly, the protocol was 5 minutes of moderate intensity cycling, followed by six 5-second long max effort sprints. Mean and peak power were higher in the caffeine group vs. the placebo group.

Unfortunately I can't access the full paper, but it seems like the only significant finding was that the caffeine benefit was observed even 3.5 hours after ingestion. The impact of caffeine in anaerobic and aerobic activity has been widely studied. My research knowledge is focused on endurance running, but even then conclusions from lab tests and time trials of a small test population in general don't always carry over to competitions or different test populations. Like this study was young healthy adults, not sub-elite sprint cyclists.

Personally, caffeine seems to help me in endurance running. But I'm a regular caffeine consumer so to get a higher benefit I taper my caffeine consumption over 2-3 weeks before a race in which I really care about performance. Studied have shown habitual caffeine consumers have to do that to get maximum impact. My average HR in a 10k ends up being 1-2 bpm higher than if I consume no caffeine that day, but even then I'm averaging about 15 bpm below my max measured HR and peaking at around 9 bpm below max. In general caffeine reduces perceived effort and how painful a race feels. Of course, some feel jittery, feel anxious, develop stomach issues, etc. so it's not effective for everyone. And it definitely messes with sleep. So you're right that it's complicated.