The effect of an external nasal dilator on the work of breathing (WOB) was measured during exercise in 14 untrained college students (age, 24 ± 3 yrs). Two maximal, incremental ergometer tests were performed to exhaustion. Subject's wore a placebo or an active nasal dilator strip, in random order, during each test. An esophageal balloon was placed through the subject's mouth into the esophagus for measurement of inspiratory elastic work (inew), inspiratory resistive work (inrw), and expiratory resistive work (exrw). Subjects breathed through a Hans-Rudolph face mask that covered both the mouth and nose during both tests. Measured variables included VO2, VE, Vt, frequency of breathing (f), inew, inrw, and exrw, (work expressed in joules). An alpha level was set at p < 0.05. There were no differences in VO2, VE, Vt or f between groups (p>0.05). No significant differences were found in inew, inrw, and exrw between groups at 70% of VO2max, (mean ± SD; Placebo; inew, 0.89 ± 0.6 J, inrw, 0.74 ± 0.4 J, exrw, 0.54 ± 0.32 J; Active; inew, 0.84 ± 0.5 J, inrw, 0.65 ± 0.4 J, exrw, 0.5 ± 0.3 J; p>0.05). No difference was found in inew, inrw, and exrw at maximal exercise between groups (mean ± SD; Placebo; inew, 1.1 ± 0.6 J, inrw, 1.4 ± 0.8 J, exrw, 2.2 ± 1.8 J; Active; inew, 0.1.0 ± 0.5 J, inrw, 1.3 ± 0.7 J, exrw, 1.8 ± 0.9 J; p>0.05). Thus, wearing an external nasal dilator does not significantly reduce the work of breathing.
American College of Sports Medicine; 46th Annual Meeting; Washington State; Convention & Trade Center; June 2-5, 1999
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D-41 POSTER RESPIRATORY PHYSIOLOGY II