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Effects of continuous positive airway pressure on time to fatigue and hemodynamics during sustained heavy exercise in healthy subjects
Author(s) -
Silva Soares Pedro Paulo,
Gonçalves Thiago Rodrigues,
Barros Rogério Barbosa,
Tarso Veras Farinatti Paulo
Publication year - 2012
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.26.1_supplement.1138.40
Subject(s) - continuous positive airway pressure , medicine , hemodynamics , cardiology , heart rate , blood pressure , rating of perceived exertion , anesthesia , obstructive sleep apnea
The aim of the present study was to investigate the influence of continuous positive airway pressure (CPAP) on time to exhaustion (TLIM), rating of perceived exertion (RPE) and cardiovascular hemodynamics. Healthy male subjects (n= 10, 24±3 years old and VO 2max = 41.09 ± 7.37 mL.kg −1 .min −1 ) performed sustained heavy cycling exercise (80%VO 2max ) with CPAP (20cmH 2 O of inspiratory and 0cmH 2 O of expiratory pressures) and without CPAP (NO‐CPAP). There were two days for protocol adaptation (M1 and M2) and two experimental exercise sessions (M3 and M4) executed in NO‐CPAP and CPAP modes, in random order. Exercise days M3 and M4 were used for calculations. Heart rate (HR), systolic blood pressure (SBP) and cardiac output (CO) were obtained by infrared photopletysmograph. The RPE was determined (Borg, 0–10) for dyspnea (B.dys) and for locomotor muscles (B.loc). With CPAP, TLIM increased (555±67 to 639±127 sec, p<0.05) and B.Dys (8±3 to 6±2, p<0.05) and B.Loc (9±2 to 8±2, p<0.05) were reduced as compared to NO‐CPAP. No differences were found for HR (174±13 and 176± 12 bpm, p> 0.05), SBP (210± 32 and 211±21 mmHg, p> 0.05) and CO (16±5 and 15±5 L.min −1 , p> 0.05) for NO‐CPAP and CPAP situations, respectively. CPAP during heavy exercise increased TLIM without presenting hemodynamic changes in healthy subjects. Financial support: CNPq 481434/2008‐9 and FAPERJ E‐26/111.345/2011