title: Postural- and respiratory-related activities of abdominal muscles during post-exercise hyperventilation.
abstract: The present study focuses on the role of superficial abdominal muscles revealed by electromyographic recordings during the maintenance of a bipedal stance perturbed by post-exercise hyperventilation. Twelve healthy subjects performed six 30-s postural tests: one pre-exercise test while breathing quietly, then one test every minute for the 5 min immediately following a maximum-intensity, incremental cycling exercise test. Displacement of the centre of pressure in the sagittal plane was monitored over time. Myoelectric activities of the obliquus externus (OE), obliquus internus (OI) and rectus abdominis (RA) muscles were recorded by surface electromyography (EMG). Metabolic parameters were measured with a portable telemetric device. The change in ventilatory drive induced by exercise was accompanied by a significant increase in both postural sway parameters and EMG activities. For OE and OI, the increased EMG activities were prominent during expiration, whereas OI was silent during inspiration. OE and RA were activated during both expiration and inspiration. It is concluded that the compensation of respiratory disturbances of the erect posture appears to be less effective when minute ventilation increases. The patterns of muscle activity suggest that abdominal muscles are controlled differentially and that their functional coordination is dependent on the respiratory demand.
authors.affiliation: Université de Versailles Saint-Quentin en Yvelines, Montigny-le-Bretonneux, France. Electronic address: pascal17david@gmail.com.
authors.forename: Pascal
authors.initials: P
authors.lastname: David
authors.affiliation: Service d'électronique, Université de Technologie de Compiègne, Compiègne, France.
authors.forename: Jérémy
authors.initials: J
authors.lastname: Terrien
authors.affiliation: Université de Versailles Saint-Quentin en Yvelines, Montigny-le-Bretonneux, France; Unité 1179 INSERM, Montigny-le-Bretonneux, France; Service de Physiologie-Explorations Fonctionnelles, Hôpital Ambroise Paré, Groupe Hospitalier Paris Ile-de-France Ouest, Boulogne-Billancourt, France.
authors.forename: Michel
authors.initials: M
authors.lastname: Petitjean
mesh_terms: D004576:Electromyography; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D006985:Hyperventilation / Q000503:physiopathology*; D008297:Male; D011187:Posture / Q000502:physiology*; D017568:Rectus Abdominis / Q000503:physiopathology*; D012119:Respiration; D055815:Young Adult
keywords: Biomechanics; Electromyography; Postural control; Respiration