Final answer:
The pulse width range of motor TENS is greater than 250 microseconds, critical for targeting motor nerves.
Step-by-step explanation:
The duration (pulse width) range of motor Transcutaneous Electrical Nerve Stimulation (TENS) is >250 microseconds. TENS units are devices that are designed to provide pain relief by sending electrical impulses through electrodes placed on the skin. These devices have adjustable settings to control the intensity and duration of the electrical pulses, which are important for effective pain management. The pulse width is a key parameter that affects the depth of tissue penetration by the electrical current and the type of nerve fiber that is activated. Motor TENS, in particular, is used to activate motor nerves that may help with muscle contraction.