Phasic relations in 90° abduction-adduction of the arm: The ARIMA representation

  • Sherif M
  • Gregor R
  • Lyman J
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Abstract

Myoelectric signals (MES's) from the medial deltoid, posterior deltoid and medial trapezius were analyzed during 90° abduction-adduction cycles of arm movement. Two healthy males were utilized as subjects. The MES's records were divided into sub-sections of 50 ms of duration, and each segment was described by a suitable model. The models were based on autoregressive integrated moving average (ARIMA) processes. Several distinct phases were discerned within a given movement cycle, each phase being associated with a distinct type of ARIMA process. Phasic relations among the three muscles were then revealed. A simple test was suggested to detect the onset of muscle activity in real-time situations. © 1984.

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