Nasal structures help to clean and regulate the temperature of the air into the lungs and allows air to be expelled faster through the mouth.
Deep breath, or belly breathing, is the same core practice performed in yoga practices to relax, manage stress and improve organ function.
Nasal breathing increases the respiratory system's ability to warm and humidity the inspired air compared to oral breathing and reduces the drying and cooling effects of the increased ventilation during exercise.
relaxation induced by diaphragmatic breathing increases the antioxidant defense status in athletes after exhaustive exercise. These effects correlate with the concomitant decrease in cortisol and the increase in melatonin. The consequence is a lower level of oxidative stress, which suggests that an appropriate diaphragmatic breathing could protect athletes from long-term adverse effects of free radicals.