Final answer:
TENS works by stimulating large-diameter fibers to block the transmission of pain signals, offering physical relief for localized pain, rather than psychological relief or for generalized pain.
Step-by-step explanation:
When using a transcutaneous electrical nerve stimulation (TENS) device for a client with chronic lower back pain, it is important to consider several factors. Option 4 presents the correct statement. TENS stimulates large-diameter fibers to inhibit the transmission of painful impulses, which is consistent with gate control theory of pain management. It is a noninvasive technique and can be used for varying time periods, often longer than 6 to 8 minutes, depending on the patient's needs and the healthcare provider's recommendations. TENS provides physical pain relief through electrical stimulation rather than psychological relief and is typically used for localized areas of pain rather than generalized or diffuse pain.