Participants were asked to abstain
from consuming caffeine or drinking alcohol during 12 h
before initiation of the test session. The subjects were
randomly divided into two experimental (fourteen sub-
jects, mean age: 23 2 years) and control (fifteen sub-
jects, mean age: 23.07 1.94 years) groups.
The study was approved by the ethics committee of Tehran University of Medical Sciences and informed written consents were obtained from all of the subjects.