Electromyographic Biofeedback

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Electromyographic Biofeedback

  1. 1. Electromyographic Biofeedback<br />Casey Christy, MA, ATC, CSCS<br />
  2. 2. Biofeedback<br />Electromyographic Biofeedback (EB) detects and amplifies neurological activity, and then converts it to auditory and/or visual signals. <br />
  3. 3. Biofeedback<br />EB serves as an adjunct treatment for muscle re-education, strengthening or even to encourage relaxation of a muscle group. <br />
  4. 4. Biofeedback<br />Basic EB units have silver surface electrodes with three sensors grouped together as one adhesive electrode. Two of the sensors are “active electrodes” that measure electrical activity within the muscle. The other sensor is the “reference electrode,” which filters out non-meaningful electrical activity. <br />
  5. 5. Biofeedback<br />Image courtesy of Starkey, therapeuticmodalities.com, FA publishers<br />
  6. 6. Biofeedback<br />Edema, pain, surgery, immobilization, and decreased output from joint receptors can inhibit voluntary muscle contractions. EB can help the CN re-establish sensory-motor loops “forgotten” by the patient. <br />
  7. 7. Biofeedback<br />Biofeedback measures the electrical activity in the muscle, not the strength of contraction.<br />
  8. 8. Biofeedback<br />The strength of muscle contraction is improved once normal neurological pathways are restored.<br />
  9. 9. Biofeedback<br />To help retain the newly learned neurological pathways, the patient should perform active muscle contractions without the EB immediately after the treatment. <br />
  10. 10. Biofeedback<br />Contraindications include conditions in which muscular contractions, joint movement or motion is contraindicated. <br />
  11. 11. Biofeedback<br />Electrodes should be placed over the muscle’s motor point or the muscle belly.<br />
  12. 12. Biofeedback<br />Myotrac controls<br />Gain<br />x1,x10,x100<br />Threshold<br />Higher gain= less sensitivity to contraction= more difficulty<br />Higher threshold= less sensitivity to contraction= more difficulty<br />
  13. 13. Biofeedback<br />Clinical Application Examples<br />Place over VMO while patient performs terminal knee extensions<br />Place over rhomboids while patient performs scapular retraction<br />Place over mid quadricep while patient performs quad setting exercises<br />
  14. 14. Biofeedback<br />Myotrac Threshold setting<br />Patient must hold contraction in target zone for 4 seconds in order for alarm to sound.<br />
  15. 15. Biofeedback<br />Some biofeedback units are combined with electrical stimulation to enhance muscle re-education.<br />Electrical simulation starts once the patient achieves a voluntary contraction beyond a set threshold or target.<br />
  16. 16. Reference<br />Starkey, Therapeutic Modalities, 3rd Edition.<br />

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