Biophysical Agents Final exam

When applying NMES what structure are you stimulating? - Answer- The peripheral nerves What are the two ways to increase strength? - Answer- Increase muscle size and improve motor unit recruitment What fibers are initiated first in a muscle contraction? - Answer- small units and progresses to larger units as the force demand increases What type of wave form do you use for NMES? - Answer- symmetrical biphasic waves When using NMES what would the pulse duration be set at? - Answer- 200-600 msec you want it to be longer so that you can elicit a contraction When using NMES what would the pulse frequency be set at? - Answer- 50-80 pps When would you use NMES? - Answer- When you are trying to re-educate/retrain muscle for movement and posture Trying to prevent atrophy and increase ROM Why would you use functional electrical stimulation? - Answer- to help facilitate purposeful movement assist with ambulation improve circulation reverse cardiopulmonary deconditioning attenuate bone demineralization following spinal cord injury What waveforms are typically used for FES? - Answer- symmetrical biphasic, burst modulated AC What should be the pulse duration for FES? - Answer- 200-600 msec What should be the pulse frequency for FES? - Answer- 20-60 pps (less than NMES so they can ambulate) Why does FES have a lower frequency than NMES? - Answer- Because a higher frequency will fatigue the muscle quicker. You are using FES to help meet a functional task, if the muscle is fatigued too quickly it will not be able to perform. What modality is best suited for muscle contraction and strengthening? - Answer- Russian What