How did Claude Bernard help establish experimental medicine?

Claude Bernard was a foundational figure in experimental medicine who moved the field beyond the vague concepts of vitalism and indeterminism that characterized earlier physiology.1

He established his influence through several key contributions:

• Methodological Rigor: Bernard moved away from purely empirical observation, demonstrating that scientific progress requires a guiding hypothesis that must be systematically confirmed or refuted by experimentation.2
• Foundational Principles: In his seminal work, An Introduction to the Study of Experimental Medicine, he argued that medicine must be grounded in experimental physiology, utilizing the physical and chemical sciences to understand life processes as mechanistically determined.2
• The Internal Environment: He introduced the concept of the milieu intérieur, or internal environment, which provided the basis for our modern understanding of homeostasis.12
• Research Standards: He asserted that vivisection was an indispensable tool for physiological research, ensuring that biological study remained rooted in observable, physical reality.2

By framing life as a series of physico-chemical processes, Bernard transformed medicine into a rigorous, evidence-based science.12