Breathing technique can materially affect endurance by altering oxygen delivery, the work of breathing, and the perception of effort. Scientific work identifies two practical approaches with consistent evidence: strengthening the respiratory muscles and controlling breathing pattern and airflow. These address different causes of exercise limitation and, when combined, tend to produce the largest benefit for prolonged activity.
Respiratory muscle training and workload
Respiratory muscle training targets the inspiratory and sometimes expiratory muscles so they resist fatigue during long exercise. Research led by Andrew W. Sheel at the University of British Columbia and Jennifer A. Guenette at McMaster University documents that respiratory muscle fatigue contributes to earlier exhaustion and that specific inspiratory muscle training can reduce breathlessness and delay task failure. Mechanistically, stronger respiratory muscles lower the relative work required for a given ventilation, reduce the respiratory muscle metaboreflex that diverts blood from limb muscles, and diminish perceived exertion. These changes do not guarantee large gains for every athlete, but they are reproducible across many studies and sports.
Breathing patterns and airflow control
Controlling breathing—through diaphragmatic breathing, paced inhalation/exhalation, and, in some contexts, nasal breathing—affects gas exchange and autonomic state. Jon O. Lundberg at the Karolinska Institute described how nasal airflow releases nitric oxide, a vasodilator that can influence ventilation–perfusion matching in the lungs; nasal breathing therefore may improve efficiency in low-to-moderate intensity efforts. Diaphragmatic, belly-first breathing reduces accessory muscle recruitment and chest wall rigidity, lowering energy cost. Rhythmic, cadence-linked breathing helps synchronize respiratory demands with stride or pedal forces and reduces unnecessary hyperventilation, which otherwise raises work of breathing and can alter blood pH.
Together, these techniques reduce the physiological causes of early fatigue—excessive respiratory work, impaired muscle blood flow, and high perceived effort—and produce practical consequences: longer time to exhaustion, better pacing control, and reduced respiratory discomfort. Cultural practices such as pranayama in yoga illustrate longstanding human use of breath control for endurance and focus, while device-based training offers a medicalized route for athletes and clinical populations.
Practice under guidance is advised, because overemphasizing nasal breathing at very high intensities or self-prescribing high-resistance respiratory training can be counterproductive. For durable gains, integrate breathing drills into regular training and consider respiratory muscle training protocols supervised by exercise or clinical professionals.