Overview of the experimental protocol.

In the baseline trial (TB) participants underwent a physical exertion bout that started at 1200 h without any SHS. In the remaining trials, one hour of SHS was administered at either 0800 h (T3), 1000 h (T1) or 1100 h (T0), while the same physical exertion protocol initiated at 1200 h. SHS = secondhand smoke.