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Front Physiol. 2019 Jan 15;9:1970. doi: 10.3389/fphys.2018.01970. eCollection 2018.

Putative Role of Respiratory Muscle Training to Improve Endurance Performance in Hypoxia: A Review.

Frontiers in physiology

Jesús Álvarez-Herms, Sonia Julià-Sánchez, Francisco Corbi, Adrian Odriozola-Martínez, Martin Burtscher

Affiliations

  1. Department of Cell Biology, Physiology and Immunology, Faculty of Biology, University of Barcelona, Barcelona, Spain.
  2. National Institute of Physical Education of Catalonia (INEFC) - Lleida Centre, University of Lleida, Lleida, Spain.
  3. Department of Genetics, Anthropology and Physiology, University of the Basque Country (UPV), Campus de Bizkaia, Bilbao, Spain.
  4. Department of Sport Science, University Innsbruck, Innsbruck, Austria.

PMID: 30697170 PMCID: PMC6341067 DOI: 10.3389/fphys.2018.01970

Abstract

Respiratory/inspiratory muscle training (RMT/IMT) has been proposed to improve the endurance performance of athletes in normoxia. In recent years, due to the increased use of hypoxic training method among athletes, the RMT applicability has also been tested as a method to minimize adverse effects since hyperventilation may cause respiratory muscle fatigue during prolonged exercise in hypoxia. We performed a review in order to determine factors potentially affecting the change in endurance performance in hypoxia after RMT in healthy subjects. A comprehensive search was done in the electronic databases MEDLINE and Google Scholar including keywords: "RMT/IMT," and/or "endurance performance," and/or "altitude" and/or "hypoxia." Seven appropriate studies were found until April 2018. Analysis of the studies showed that two RMT methods were used in the protocols: respiratory muscle endurance (RME) (isocapnic hyperpnea: commonly 10-30', 3-5 d/week) in three of the seven studies, and respiratory muscle strength (RMS) (Powerbreathe device: commonly 2 × 30 reps at 50% MIP (maximal inspiratory pressure), 5-7 d/week) in the remaining four studies. The duration of the protocols ranged from 4 to 8 weeks, and it was found in synthesis that during exercise in hypoxia, RMT promoted (1) reduced respiratory muscle fatigue, (2) delayed respiratory muscle metaboreflex activation, (3) better maintenance of SaO

Keywords: adaptation; hypoxia; muscle endurance; physical performance; respiratory exercises; respiratory muscles; training

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