The effect of resisted inspiration during an active straight leg raise in pain-free subjects.

Autor: Beales DJ; School of Physiotherapy, Curtin Health Innovation Research Institute, Curtin University of Technology, Perth, Western Australia, Australia. darren.beales@westnet.com.au, O'Sullivan PB, Briffa NK
Jazyk: angličtina
Zdroj: Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology [J Electromyogr Kinesiol] 2010 Apr; Vol. 20 (2), pp. 313-21. Date of Electronic Publication: 2009 Jun 21.
DOI: 10.1016/j.jelekin.2009.05.003
Abstrakt: Alterations of respiratory patterns have been observed in pelvic girdle pain subjects during the active straight leg raise (ASLR). This study investigated how pain-free subjects coordinate motor control during an ASLR when this task is complicated by the addition of a respiratory challenge. Trunk muscle activation, intra-abdominal pressure, intra-thoracic pressure, pelvic floor motion, downward pressure of the non-lifted leg and respiratory rate were compared between resting supine, ASLR, breathing with inspiratory resistance (IR) and ASLR+IR. Subjects responded to ASLR+IR with an increase in the motor activation in the abdominal wall and chest wall compared to when ASLR and IR were performed in isolation. Activation of obliquus internus abdominis was greater on the side of the leg lift during the ASLR+IR, in comparison to symmetrical activation observed in the other abdominal wall muscles. The incremental increase of motor activity was associated with greater intra-abdominal pressure baseline shift when lifting the leg during ASLR+IR compared to ASLR. Individual variation was apparent in the form of the motor control patterns, mostly reflected in variable respiratory activation of the abdominal wall. The findings highlight the flexibility of the neuromuscular system in adapting to simultaneous respiratory and stability demands.
(2009 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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