"Functional" Respiratory Muscle Training During Endurance Exercise Causes Modest Hypoxemia but Overall is Well Tolerated

Journal of Strength and Conditioning Research
Jorge GranadosMatthew R Kuennen

Abstract

A novel commercial training mask purportedly allows for combined respiratory muscle training and altitude exposure during exercise. We examined the mask's ability to deliver on this claim. Ten men completed three bouts of treadmill exercise at a matched workload (60%VO2peak) in a controlled laboratory environment. During exercise, the mask was worn in 2 manufacturer-defined settings (9,000 ft [9K] and 15,000 ft [15K]) and a Sham configuration (∼3,500 ft). Ventilation (V(E)), tidal volume (V(T)), respiratory rate (R(R)), expired oxygen (F(E)O2) and carbon dioxide (F(E)CO2), peripheral oxygen saturation (S(P)O2), heart rate, and RPE were measured each minute during exercise, and subjects completed the Beck Anxiety Inventory (BAI) immediately after. The mask caused a reduction in V(E) of ∼20 L/min in both the 9K and 15K configurations (p < 0.001). This was due to a reduction in R(R) of ∼10 b·min, but not V(T), which was elevated by ∼250 ml (p < 0.001). F(E)O2 was reduced and F(E)CO2 was elevated above Sham in both 9K and 15K (p < 0.001). VO2 was not different across conditions (p = 0.210), but VCO2 trended lower at 9K (p = 0.093) and was reduced at 15K (p = 0.016). V(E)/VO2 was 18.3% lower than Sham at 9K and 19.2% lower at 15K. V...Continue Reading

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Citations

May 31, 2018·Journal of Strength and Conditioning Research·Thomas L AndreDarryn S Willoughby
Sep 12, 2018·Journal of Strength and Conditioning Research·Cássia L TeodoroAntonio C Moraes
Oct 31, 2017·Journal of Strength and Conditioning Research·Andrew R JagimJonathan M Oliver
Jan 23, 2021·International Journal of Environmental Research and Public Health·Jose L Gonzalez-MontesinosJesus G Ponce-Gonzalez
Apr 20, 2021·International Journal of Gynaecology and Obstetrics : the Official Organ of the International Federation of Gynaecology and Obstetrics·Lior FriedrichRaanan Meyer
Feb 23, 2019·Journal of Strength and Conditioning Research·Salvador Romero-ArenasGonzalo Márquez
Sep 28, 2021·Revista Portuguesa De Cardiologia : Orgão Oficial Da Sociedade Portuguesa De Cardiologia = Portuguese Journal of Cardiology : an Official Journal of the Portuguese Society of Cardiology·Tiago PimentaAfonso Rocha

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