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Comparative Study
. 2016 Oct;30:143-50.
doi: 10.1016/j.jelekin.2016.07.002. Epub 2016 Jul 5.

Abdominal Muscle Activity During Breathing With and Without Inspiratory and Expiratory Loads in Healthy Subjects

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Comparative Study

Abdominal Muscle Activity During Breathing With and Without Inspiratory and Expiratory Loads in Healthy Subjects

António Mesquita Montes et al. J Electromyogr Kinesiol. .

Abstract

Central Nervous System modulates the motor activities of all trunk muscles to concurrently regulate the intra-abdominal and intra-thoracic pressures. The study aims to evaluate the effect of inspiratory and expiratory loads on abdominal muscle activity during breathing in healthy subjects. Twenty-three higher education students (21.09±1.56years; 8males) breathed at a same rhythm (inspiration: two seconds; expiration: four seconds) without load and with 10% of the maximal inspiratory or expiratory pressures, in standing. Surface electromyography was performed to assess the activation intensity of rectus abdominis, external oblique and transversus abdominis/internal oblique muscles, during inspiration and expiration. During inspiration, transversus abdominis/internal oblique activation intensity was significantly lower with inspiratory load when compared to without load (p=0.009) and expiratory load (p=0.002). During expiration, the activation intensity of all abdominal muscles was significantly higher with expiratory load when compared to without load (p<0.05). The activation intensity of external oblique (p=0.036) and transversus abdominis/internal oblique (p=0.022) was significantly higher with inspiratory load when compared to without load. Transversus abdominis/internal oblique activation intensity was significantly higher with expiratory load when compared to inspiratory load (p<0.001). Transversus abdominis/internal oblique seems to be the most relevant muscle to modulate the intra-abdominal pressure for the breathing mechanics.

Keywords: Core abdominal; Postural control; Respiration; Respiratory loads; Surface electromyographic activity.

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