Crosstalk in surface electromyography of the proximal forearm during gripping tasks.

摘要: Electromyographic (EMG) crosstalk was systematically analyzed to evaluate the magnitude of common signal present between electrode pairs around forearm. Surface EMG recorded and from seven placed circumferentially proximal forearm in six healthy individuals. The cross-correlation function used determine amount signal, which found decrease as distance increased, but not significantly altered by posture (pronation, neutral, supination). Overall, approximately 40% detected adjacent (3 cm apart), dropping about 10% at 6 spacing 2.5% 9 cm. approached 50% over extensor muscles, while 60% observed neighbouring sites on flexor aspect Although amplitude similar, less than 2% during both pinch grasp tasks. Maximum grip force production affected rotation for pinch, reduced 18% neutral (mid-prone) pronation (p=0.01). In spite differences force, mean muscle activity did vary three postures maximum or trials. While this study improved our knowledge issues, further examination is required improve understanding loading, properties motor control gripping