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Related to Arndt-Schultz principle: Cosine law, Davis' law
[Rudolf Arndt, Ger. psychiatrist, 1835–1900; Hugo Paul Friedrich Schultz, Ger. pharmacologist, 1853–1932]
The rule that therapeutically applied energy (e.g., thermal agents, ultrasonic energy) must be of the proper intensity per unit of time to stimulate the desired physiological response.