Annals of Rehabilitation Medicine

Analysis of Interference Pattern of Quantitative Electromyography in Early Adolescence.: Park, Ki Deok , Lee, Sang Chul , Park, Yoon Ghil , Moon, Jae Ho; J Korean Acad Rehabil Med 2007;31(3):333-340.

Abstract
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Objective
To establish turns-amplitude, activity-envelope amplitude and activity-number of small segements (NSS) clouds of normal early teens using interference pattern. Method: Forty four healthy early adolescence from 11 to 15 years old participated in this study. The interference patterns were analyzed using quantitative electromyography of the biceps brachi and tibialis anterior muscles. The interference patterns were measured at 3 to 5 different force levels ranging from minimum to maximum and turns, mean amplitude, activity, envelope amplitude, NSS were analyzed. By turns/amplitude, activity/envelope amplitude and activity/ NSS ratio, normal clouds of gender related each parameters were obtained. Results: The turns-amplitude, activity-envelope amplitude and activity-NSS ratio of the biceps brachii and tibialis anterior muscles were obtained. Normal clouds of gender related turns-amplitude, activity-envelope amplitude and activity-NSS for each muslces were established. Conclusion: By using normal cloud patterns of turns- amplitude, activity-envelope amplitude and activity-NSS, automatic interference pattern analysis may contribute to diagnose neuromuscular disease in early adolescent patients. (J Korean Acad Rehab Med 2007; 31: 333-340)

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Establishment of Clouds of Envelope Amplitude-Activity and Number of Small Segments-Activity in Normal Adults.: Choi, Won Ah , Lee, Sang Chul , Park, Yoon Ghil , Moon, Jae Ho , Kim, Wan , Lee, Soo Hyun; J Korean Acad Rehabil Med 2007;31(2):213-219.

Abstract
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Objective
To establish the envelope amplitude-activity and number of small segments (NSS)-activity clouds of normal adults using the interference pattern of quantitative electromyography (EMG). Method: Healthy adults whose ages were from 20 to 59 years old participated in this study. Using quantitative EMG of the biceps brachii, vastus medialis, and tibialis anterior muscle, the interference patterns were analyzed. The interference patterns were measured at three to five different force levels, ranging from minimum to maximum, and recorded at least 20 epochs at each muscle. Results: The envelope amplitude-activity and NSS-activity ratio of the biceps brachii, vastus medialis, and tibialis anterior muscles were obtained in males and females. The establishment of normal clouds of gender related envelope amplitude-activity and NSS-activity were obtained. Conclusion: By using the above normal clouds of envelope amplitude-activity and NSS-activity, automatic interference pattern analysis may contribute to early diagnosis and detection of progress of myopathy and neuropathy. (J Korean Acad Rehab Med 2007; 31: 213-219)

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Changes of Electromyographic Signals Following Peripheral Nerve Injury.: Sohn, Min Kyun , Yoon, Yeo Sam; J Korean Acad Rehabil Med 1997;21(3):547-552.

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Quantitative analysis of abnormal spontaneous activities, motor unit action potentials and interference patterns were recorded in 55 subjects with traumatic peripheral nerve injury to understand the changes of electromyographic signals.

We analyzed amplitudes of fibrillation potentials and positive sharp waves at rest, amplitude, duration, spike duration and polyphasicity of motor unit action potentials at minimal contraction, and the root mean square(RMS), and mean rectified voltage (MRV) at maximal contraction.

The amplitudes of fibrillation potentials and positive sharp waves had negative correlations with the duration of peripheral nerve injury but the amplitudes of motor unit action potentials, RMS, and MRV had positive correlations.

Therefore electromyographic evaluation could be used for the estimation of the duration of peripheral nerve injury.