Journal des troubles du sommeil et de la thérapie
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Effect of Body Position on Respiratory Muscle Activity in Subjects with Upper Costal or Costo-diaphragmatic Breathing Type

Rodolfo Miralles, Isabel Celhay, Rosa Cordova, Hugo Santander, Saúl Valenzuela, Aler Daniel Fuentes, Mario Felipe Gutiérrez and Ricardo Bull

Effect of body position on electromyographic (EMG) activity has been studied in the cranio-cervical-mandibular muscles, but its effect on the activity of respiratory muscles in subjects with different breathing types has not yet been elucidated. This study included two groups of twenty male subjects each, one with upper costal and the other with costo-diaphragmatic breathing type. EMG activity was recorded using bipolar surface electrode technique. Electrodes were placed on the sternocleidomastoid (SCM), diaphragm (DIA), and external intercostal (EIC) and Latissimus dorsi (LAT) muscles. EMG activity was recorded in standing and lateral decubitus positions, during the following tasks: [1] Normal quiet breathing; [2] speaking the word “Mississippi”; [3] forced deep breathing. EMG activity of DIA and EIC muscles was higher in the standing than in the lateral decubitus position during all tasks in both breathing groups (p