REMBE Electrotherapy Practice Test

According to the claim that tetanic contractions are not set up by currents, which current is the right choice?

Low Frequency Current High Frequency Current Both Neither

Correct Answer:

High Frequency Current

Explanation:

The key idea is how stimulation frequency drives muscle response. Tetanic contraction happens when impulses arrive so quickly that the muscle fibers don’t have time to relax between stimuli, so the contractions fuse into a sustained, smooth force. That requires a high-frequency current, which delivers pulses rapidly enough to cause summation of contractions. A low-frequency current, by contrast, produces separate twitches with relaxation between them, not a fused tetanus. So the high-frequency current is the one that can set up tetanic contraction, while the others do not.

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