• M De Sant'anna, A Mafra Moreno, and P P Da Silva Soares.
• Physiotherapy Departament Plínio Leite University Center, Niterói, Brazil. Physicaltherapy in Hospital University Clementino Fraga Filho, Rio de Janeiro, Brazil - fisioenf@hotmail.com.
• J Sport Med Phys Fit. 2013 Dec 1; 53 (6): 604-11.

AimWe investigated the effects of continuous positive airway pressure (CPAP) on the time to fatigue, rates of perceived exertion (RPE), and cardiovascular responses during sustained, high-intensity exercise (80% of VO2peak).MethodsHealthy male subjects (N.=11) underwent CPAP adaptation at rest to exclude those who felt incapable of breathing with the device and to determine the hemodynamic-induced changes. Subjects performed two exercise sessions, pedaling at 80% of VO2peak with or without CPAP until volitional fatigue. Heart rate was measured continuously, and blood pressure and RPE were recorded every minute.ResultsThe time to exhaustion was increased in the sessions with CPAP compared with sessions without CPAP (889±270 s vs. 689±256 sec, respectively, P=0.037). There were no differences in the cardiovascular variables at the end of the exercise sessions with or without CPAP. The RPE was lower during exercise with CPAP, but it reached maximal values similar to those observed at the end of exercise without CPAP.ConclusionDuring sustained, high-intensity exercise (80% of VO2peak), CPAP extended the time to fatigue in healthy subjects but did not change the heart rate, blood pressure or rate pressure product. Additionally, the central and peripheral RPEs remained lower for a longer period of time during exercise with CPAP.

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