ELECTROMYOGRAPHY OF SCALENE AND RECTUS ABDOMINIS DURING THE RESPIRATORY CYCLE IN HEALTHY SUBJECTS

Abstract

TYPE: Abstract Publication TOPIC: Pulmonary Rehabilitation PURPOSE: Expose the electromyography and spirometry relationship and establish the chronology of the contraction of Scalene and Rectus abdominis which works together in synergy antagonism in physiological breathing METHODS: 128 electromyographic tests were performed during the respiratory cycle on 43 healthy adults. EMG signals of Scalene, Rectus abdominis were recorded. The breathing was recorded by using a spirometer (vernier®). RESULTS: The duration of Scalene contraction is superior to Rectus abdominis 82% p-value = 0.000058, the amplitude of Scalene is superior of Rectus abdominis, p-value = 0.000000073. 109 tests of Scalene contraction begin before that of Rectus abdominis (63.74%), p-value = 0.000012. RMS is 0.02 ± 0.011 μv for Rectus abdominis and 0.04 ± 0.021 μv for Scalene, p-value = 6.76591E-06. Duration of inspiration is 1.25 s ± 0.19, the expiration is 1.04 s ± 0.19. The mean frequency of Rectus abdominis is 54.19 Hz ± 6.35, it is 57.21 Hz ± 7.08 for Scalene, p-value is 9.84081E-08. The median frequency of Rectus abdominis is 51.05 Hz ± 6.51, it is 52.72 Hz ± 6.94 for Scalene, p-value is 0.0098. CONCLUSIONS: There is a synergistic - antagonism relationship between Scalene and Rectus abdominis during respiration. Scalene is a main inspiratory muscle, its contraction is important in amplitude, duration and frequency. CLINICAL IMPLICATIONS: Use of the results to define the EMG role of the Rectus abdominis as synergistic - antagonist of the inspiratory muscles and in spinal cord injury patient with total or partial paralysis of the abdominals (C5 and T12 ) to correct the restrictive respiratory syndrome DISCLOSURE: No significant relationships. KEYWORD: Respiratory cycle, EMG signal, Scalene, Rectus Abdominis.