Final answer:
The duration range of brief-intense (noxious) TENS is greater than 250 microseconds, which is important for therapeutic effects without causing damage or discomfort.
Step-by-step explanation:
The duration (pulse width) range of brief-intense (noxious) TENS (Transcutaneous Electrical Nerve Stimulation) is typically within the range of >250 microseconds. The pulse width is regarded as the duration of the electric current's pulse. In medical applications like pain relief or muscle stimulation, it is crucial to adjust this duration correctly to achieve the desired therapeutic effects without causing tissue damage or unnecessary discomfort to the patient.