Train Your Breath, Change Your Brain: Respiratory Muscle Training with Dr. Lawrence Cahalin

You breathe about 20,000 times a day without thinking — but what if that automatic act could be trained to lower your blood pressure, sharpen your thinking, and even strengthen your heart? Dr. Lawrence Cahalin, clinical professor of physical therapy at the University of Miami and a Fellow of the American Physical Therapy Association and the American Heart Association, has spent his career studying exactly that. His research on respiratory muscle training is revealing just how much the breath influences nearly every system in the body. In this conversation, Dr. Cahalin joins Dr. Brent Anderson to explore the science behind training your breathing muscles — not just for lung health, but for cognitive performance, cardiovascular function, and healthy aging. They discuss why a slightly irregular heartbeat during deep breathing is actually a sign of a healthy nervous system, how weak breathing muscles can literally steal blood flow from your legs, and what everyday breath training tools look like for patients and athletes alike. They also explore the emerging research on Wim Hof breathing, the connection between breath and sleep quality, and why ancient practices like Pilates, yoga, and qigong may have been onto something science is only now catching up to. In this episode: How heart rate variability and sinus arrhythmia signal autonomic nervous system health The respiratory metaboreflex — why weak breathing muscles reduce walking ability in people with heart and lung disease Research on inspiratory muscle training improving blood pressure, mitochondrial metabolism, and cognition Devices for respiratory muscle training at home, including the PowerBreathe, threshold trainers, and a DIY sphygmomanometer hack The science behind Wim Hof breathing and intermittent hypoxia How breath pressure gradients affect blood flow to and from the brain The connection between better breathing, self-efficacy, and quality of life Resources mentioned: Research by Dr. Doug Seals, University of Colorado Boulder (high-intensity inspiratory muscle training) Seals Lab — Integrative Physiology of Aging Laboratory CU Boulder: "Could Focused Breathing Be a Key to Better Health?" (2023) CU Boulder: "5-Minute Breathing Workout Lowers Blood Pressure" (2021) Pro2 respiratory training device PowerBreathe device University of Miami Department of Physical Therapy