The Neuroscience of Breathing: Brain Control, Health, and Performance with Dr. Jack Feldman

This episode features Dr. Jack Feldman, a distinguished Professor of Neurobiology at UCLA and a pioneer in the neuroscience of breathing, discussing the brain's intricate control over respiration and its profound impact on mental and physical health. Feldman's foundational work highlights that breathing is not merely a passive act for oxygen intake but a dynamic process influencing focus, sleep, stress, and overall organ function. He is credited with discovering the two primary brain centers that control different patterns of breathing: the pre-Botzinger complex, responsible for rhythmic inspiration, and the retro-trapezoid nucleus, which governs active expiration and acts as a central chemoreceptor for regulating carbon dioxide levels and pH balance in the brain.

A crucial distinction is made between passive exhalation at rest, where respiratory muscles simply relax, and active exhalation, which engages muscles like the abdominals and internal intercostals during increased ventilation, such as during exercise or specific breathwork. The diaphragm, a muscle unique to mammals, is presented as an extraordinarily efficient mechanical advantage, capable of expanding the lung's vast surface area (approximately 70 square meters, or a third of a tennis court) with minimal movement, thereby facilitating optimal gas exchange. The discussion also touches on the evolutionary development of the diaphragm and how mammalian breathing differs significantly from that of amphibians and reptiles.

Dr. Feldman, who is also a practitioner, shares insights into how individuals can leverage specific breathing patterns to bias their brain into particular states. The episode promises to provide a framework for understanding the underlying science, empowering listeners to customize breathwork protocols for various goals, such as enhancing focus for work, disengaging from high-stress activities, or calming down quickly. While specific detailed protocols are not fully outlined in this introductory segment, the emphasis is on understanding the 'how' and 'why' behind these practices to enable personalized application.

The conversation underscores the fundamental role of respiration in both health and disease, with examples like asthma being linked to inappropriate smooth muscle constriction in the airways rather than direct brainstem involvement in its causation. It emphasizes that understanding the underlying neural mechanisms of breathing offers powerful tools for self-regulation, high performance, and combating disease, making this deep dive into respiratory neuroscience relevant for everyone, from casual breathers to dedicated breathwork practitioners seeking to optimize their mental and physical states.

breathing is also fundamental to organ health and function at an enormous number of other levels.

how we breathe, including how often we breathe, the depth of our breathing and the ratio of inhales to exhales actually predicts how focused we are, how easily we get into sleep, how easily we can exit from sleep.

Dr. Feldman gets credit for the discovery of the two major brain centers that control the different patterns of breathing.

Prior to his coming into neuroscience from the field of physics, there really wasn't much information about how the brain controls breathing.

At rest it's passive. We'll get into what happens when you need to increase the amount of air you're bringing in because your ventilation, your metabolism goes up like during exercise.

This small site, which contains in humans, a few thousand neurons, it's located on either side and works in tandem and every breath begins with neurons in this region beginning to be active, and those neurons then connect ultimately to these motor neurons going to the diaphragm and to the external intercostals causing them to be active and causing this inspiratory effort.

Breathing is one of those oscillators that for life has to be working continuously 24/7.

The amazing thing about the diaphragm is that it's mechanically extremely efficient.

So you have a membrane inside of you a third the size of a tennis court that you actually have to expand every breath.

Asthma is a condition where you get inappropriate constriction of the smooth muscles of the airways.