Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Rating of perceived exertion, measured with the Borg scale during an incremental step exercise test on a cycle ergometer in active individuals who ingested (1) a placebo; (2) three mg of caffeine per kg of body mass (received caffeine); and (3) a placebo, but they were told they were given three mg of caffeine per kg mass (informed caffeine). (*) Received caffeine different from placebo for the same workload at p < 0.050.
