Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/9144
Título: Abdominal muscle activity during breathing with and without inspiratory and expiratory loads in healthy subjects
Autor: Mesquita Montes, António
Baptista, João
Crasto, Carlos
de Melo, Cristina Argel
Santos, Rita
Vilas-Boas, João Paulo
Palavras-chave: Respiration
Postural control
Core abdominal
Respiratory loads
Surface electromyographic activity
Data: 2016
Resumo: 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.
Peer review: yes
URI: http://hdl.handle.net/10400.22/9144
DOI: 10.1016/j.jelekin.2016.07.002
ISSN: 1050-6411
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