Rediscovering the Science of Breathing
Science journalist James Nestor investigated the biology of breathing in his book Breath: The New Science of a Lost Art. Through discussions with respiratory scientists, physicians, and performance specialists, Nestor examines how modern breathing habits can influence health, athletic performance, and recovery.
His research suggests that the human nose plays a far more important role in respiration than many people realise.
Why the Nose Matters
According to Nestor’s work, nasal breathing naturally slows and regulates the breathing process. This controlled breathing rhythm allows the lungs to absorb oxygen more efficiently compared with rapid or irregular mouth breathing.
Breathing through the nose also provides several physiological advantages. The nasal passages warm, filter, and humidify incoming air before it reaches the lungs, helping protect the respiratory system and reducing irritation during physical activity.
For athletes, this conditioning of airflow can support greater respiratory comfort during prolonged exercise.
Nitric Oxide and Oxygen Transport
A major focus of Nestor’s work involves the production of Nitric Oxide in the nasal passages.
Nitric oxide helps expand blood vessels and improve circulation throughout the body. This process may assist the transport of oxygen to working muscles during exercise, supporting the body’s ability to sustain physical effort.
Because nitric oxide is produced in the nasal passages, breathing through the nose plays an important role in delivering this molecule to the lungs and bloodstream.
Evidence from Breathing Experiments
Nestor has also described controlled breathing experiments in which participants were required to breathe exclusively through the mouth for extended periods. During these experiments, participants experienced measurable declines in sleep quality, cardiovascular markers, and respiratory efficiency.
These findings highlighted how significantly breathing patterns can influence overall physiological function.
Breathing as a Fundamental Health Habit
Through his research and writing, Nestor has helped bring widespread attention to breathing mechanics and their influence on human performance. His work suggests that improving breathing habits particularly breathing through the nose may support endurance, recovery, and long-term respiratory health.