Dr. Robert A. Henneman

Dr. Robert A. Henneman was a renowned physiologist best known for discovering the "size principle" of motor unit recruitment, which explains how our nervous system efficiently controls muscle contractions. He showed that smaller, slow-twitch muscle fibers are activated first during movement, with larger, faster fibers engaged only when more force is needed. His work helped deepen understanding of muscle function and motor control, influencing physical therapy, sports science, and medicine. Henneman's research provided foundational insights into how our bodies coordinate movement and maintain muscle strength efficiently.