Effects of a nasal ventilator restriction device on lung ventilation and gas exchange during exercise in healthy subjects

González-Montesinos, José Luis; Ponce-González, Jesús Gustavo; Vicente-Campos, Davinia; López-Chicharro, José; Rosario Fernández-Santos, Jorge del; Vaz-Pardal, Carmen; Costa-Sepúlveda, José Luis; Conde-Caveda, Julio; Castro-Piñero, José

doi:10.20960/nh.130

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Nutrición Hospitalaria

On-line version ISSN 1699-5198Print version ISSN 0212-1611

Abstract

GONZALEZ-MONTESINOS, José Luis et al. Effects of a nasal ventilator restriction device on lung ventilation and gas exchange during exercise in healthy subjects. Nutr. Hosp. [online]. 2016, vol.33, n.2, pp.444-450. ISSN 1699-5198. https://dx.doi.org/10.20960/nh.130.

Introduction and objectives: A device called FeelBreathe^® (FB) has been designed, developed and patented for inspiratory muscle training (IMT). In order to examine the effects of FB on lung ventilation and gas exchange during exercise, 27 trained male healthy volunteers (age: 32.5 ± 7.2 years) were measured. Methods: Maximum static inspiratory pressure (PI_max) and spirometry to determine lung capacity were measured at baseline. We continued with an incremental cycloergometer to determine the VO₂ peak. Three days later, each subject performed randomly three identical submaximal cycloergometer tests at 50% between ventilatory thresholds under three different breathing conditions: a) oronasal breathing (ONB), b) nasal breathing (NB) and c) nasal breathing through the FB. Results: FB trial showed lower minute ventilation (VE) and breathing frequency (BF) than NB, which had lower BF, but similar VE than ONB (p < 0.001). Despite this, FB had similar values of VO₂, respiratory exchange ratio (RER), heart rate (HR) and peripheral capillary oxygen saturation (SpO₂) compared to NB and ONB. The latter can occur partly due to increased tidal volume (VT) and expiration time (Tex) in FB until same level than NB, which were in both trials 15% and 14% respectively higher than ONB (p < 0.001). The percentage of inspiration time (Ti/Tot) was 7% greater in FB compared to NB and ONB (p < 0.001). Increased end-tidal pressure of CO₂ (P_ETCO₂) and reduced end-tidal pressure of O₂ (P_ETO₂) and fraction of O₂ expiration (FEO₂) were found only in FB. Conclusions: FeelBreathe is a new nasal restriction device that stimulates the inspiratory muscles to produce a breathing pattern more efficiency during exercise in well-trained humans.

Keywords : Nasal ventilatory restriction device; Gas exchange; FeelBreathe; Inspiratory muscle training; Efficiency breathing pattern.

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