Caffeine improved repeated cycling sprint power for at least 3.5 hours after ingestion in a 12-person study

The University of Tsukuba reports that 12 healthy young adults took caffeine (5.5 mg per kilogram of body mass) or a placebo 60 minutes before exercise, then completed repeated cycling sprint tests over 3.5 hours. It says caffeine improved mean and peak power, with benefits noticeable for at least 3.5 hours after ingestion. Participants also rated their exertion and leg muscle pain lower.