Data sources MEDLINE, EMBASE, PubMed, CINAHL, SPORTDiscus, Cochrane Library and grey literature sources were searched from inception to November/December 2020. Study eligibility criteria Observational ...

The response to amyl nitrite inhalation and the Valsalva maneuver was re-evaluated along with the exercise response at a level of 25 watts. All determinations of cardiac output were performed by the ...