Establishment of Normal Clouds for Interference Pattern Analysis of Deltoid, Adductor Magnus and Gastrocnemius Muscles

J Korean Assoc EMG Electrodiagn Med 2007;9(2):139-147.
Published online May 10, 2007.

Abstract

Objectives: To establish turns-amplitude, activity-envelope amplitude and activity-number of small segements (NSS) clouds of deltoid, adductor magnus, and gastrocnemius (GCM), in normal adults using interference pattern. Methods: Seventy-one healthy normal adults from 20 to 59 years old participated in this study. The interference patterns were analyzed using quantitative electromyography of deltoid, adductor magnus, and GCM. The interference patterns were measured at 3 to 5 different force levels ranging from minimum to maximum and recorded at least 20 epochs at each muscle. Results: The turns-amplitude, activity-envelope amplitude and activity-NSS ratio of the deltoid, adductorr magnus, and GCM were obtained. Normal clouds of gender-related turns-amplitude, activity-envelope amplitude and activity-NSS for each muslces were obtained. Conclusion: By using normal cloud patterns of turns-amplitude, activity-envelope amplitude and activity-NSS, automatic interference pattern analysis may contribute to diagnosis and detection of neuromuscular disease such as myopathy and neuropathy.

Key Words: Quantitative electromyography, Interference pattern, Normal cloud