Therapeutic Window

A range of device output parameters (typically frequency, intensity, and pulse width) within which biological effects have been observed. The idea, supported by laboratory research, is that a stimulus can be too weak to produce a measurable effect and, in some cases, that more is not automatically better: certain effects appear within specific amplitude or frequency ranges rather than climbing steadily with output. Reported effective ranges vary by study and tissue, for example the roughly 15 Hz signals used in established bone-growth devices. The practical point is that matching the output to the target matters more than simply maximizing it, which is why the report characterizes a device's output rather than ranking it by raw power.