Does the external nasal dilator strip help in sports activity? A systematic review and meta-analysis
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REVIEW ARTICLE
Does the external nasal dilator strip help in sports activity? A systematic review and meta‑analysis Ricardo Reis Dinardi1 · Carlos Henrique Santos Ferreira1 · Giordani Santos Silveira2 · Vânia Eloisa de Araújo Silva2 · Cássio da Cunha Ibiapina1 · Cláudia Ribeiro de Andrade1 Received: 30 March 2020 / Accepted: 8 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Background Numerous studies have shown that the external nasal dilator (END) increases the cross sectional area of the nasal valve, thereby reducing nasal resistance, transnasal inspiratory pressure, stabilizing the lateral nasal vestibule, and preventing its collapse during final inhalation. Objectives Our objective was to carry out a systematic review of the literature and meta-analysis on the effects of the END during physical exercise. Methods After selecting articles in the PubMed, Cochrane Library and EMBASE databases, 624 studies were identified. However, after applying the inclusion and exclusion criteria, 19 articles were considered eligible for review. Results Those studies included in the meta-analysis, the maximal oxygen uptake ( VO2max.) outcome was assessed in 168 participants in which no statistically significant difference was found, MD (95% CI) = 0.86 [− 0.43, 2.15], p = 0.19, and I2 = 0%. The heart rate (HR) outcome was assessed in 138 participants in which no statistically significant difference was found, MD (95% CI) = 0.02 [− 3.19, 3.22], p = 0.99, and I2 = 0%. The rating of perceived exertion (RPE) outcome was assessed in 92 participants in which no statistically significant difference was found, MD (95% CI) = − 0.12 [− 0.52, 0.28], p = 0.56, and I2 = 27%. Conclusions The external nasal dilator strip showed no improvement in V O2max., HR and RPE outcomes in healthy individuals during exercise. Keywords External nasal dilator · Nasal valve · Nasal resistance · Physical exercise · Performance
Introduction The anterior portion of the nasal cavities, from the nostril to the nasal valve (NV), is the region of greatest nasal resistance to airflow and of the utmost importance in nasal physiology [1]. Nasal dilators are devices that expand the cross-sectional area of the NV in an attempt to improve airflow. There are * Ricardo Reis Dinardi [email protected] 1
Department of Pediatrics, Faculty of Medicine, Federal University of Minas Gerais-Post Graduate Program in Health Sciences, Rua Sertões 100 – Ap 201 – Prado, Belo Horizonte, MG CEP: 30411‑164, Brasil
Department of Dentistry, Pontifical Catholic University of Minas Gerais-Post Graduate Program in Orthodontics, Belo Horizonte, MG, Brasil
2
several dilators currently available on the market that can act internally or externally in the NV region [2, 3]. Nasal dilators may be recommended for the relief of nasal congestion, allergic reaction, snoring, deviated nasal septum, obstructions that occur in the presence of certain diseases and to improve performance during physical exercise. Given that the END has an impact on ma
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