recruitment curve

A recruitment curve describes how the intensity of a stimulus, like a nerve or muscle stimulation, affects its response. As the stimulus strength increases, more nerve fibers or muscle units are activated, leading to a stronger response. The curve typically starts at a threshold level where response begins, then quickly rises as more units get recruited, and finally levels off once all available units are activated. This helps us understand the relationship between stimulus intensity and response, which is useful in medical testing, designing therapy, and understanding how nerves and muscles work together.