Placebo Effect of Caffeine on Physiological Parameters and Physical Performance.
David Ortiz-SánchezAlfredo Bravo-SánchezMaría Ramírez-delaCruzPablo AbiánJavier Abián-VicénPublished in: Nutrients (2024)
the placebo effect did not modify performance in the majority of the strength test variables, HRV and perception of performance and effort. However, resting heart rate was reduced, mean RR increased, and some side effects appeared in the placebo trial.