Lundberg JO, et al. High nitric oxide
production in human paranasal sinuses. Nature Medicine. 1995;1:370–373.

Yasuda Y, et al. Comparison of
exhaled nitric oxide and cardiorespiratory indices between nasal and oral
breathing during submaximal exercise in humans. Japanese Journal of Physiology.
1997;47(5):465–470.

Weitzberg E, Lundberg JO.
Humming greatly increases nasal nitric oxide. American Journal of Respiratory
and Critical Care Medicine. 2002;166(2):144–145.

Dallam GM, McClaran SR, Cox DG,
Foust CP. Effect of nasal versus oral breathing on VO2max and physiological
economy in recreational runners. International Journal of Kinesiology &
Sports Science. 2018;6(2):22.

Effect of Oral Versus Nasal
Breathing on Muscular Performance, Muscle Oxygenation, and Post-Exercise
Recovery. Sports (MDPI). 2025;13(10):368.

Young T, Finn L, Kim H. Nasal
obstruction as a risk factor for sleep-disordered breathing. Journal of Allergy
and Clinical Immunology. 1997;99(2):S757–762.

McLean HA, et al. Effect of
treating severe nasal obstruction on the severity of obstructive sleep apnoea.
European Respiratory Journal. 2005;25(3):521–527.

Koutsourelakis I, et al. (mouth
vs. nasal breathing and OSA severity), referenced widely in sleep-breathing
literature, 2006.