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Perturbed upper limb movements cause short-latency postural responses in trunk muscles.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Laboratory for Biomechanics and Motor Control.
2001 (English)In: Experimental Brain Research, ISSN 0014-4819, E-ISSN 1432-1106, Vol. 138, no 2, 243-50 p.Article in journal (Refereed) Published
Abstract [en]

Addition of a load to a moving upper limb produces a perturbation of the trunk due to transmission of mechanical forces. This experiment investigated the postural response of the trunk muscles in relation to unexpected limb loading. Subjects performed rapid, bilateral shoulder flexion in response to a stimulus. In one third of trials, an unexpected load was added bilaterally to the upper limbs in the first third of the movement. Trunk muscle electromyography, intra-abdominal pressure and upper limb and trunk motion were measured. A short-latency response of the erector spinae and transversus abdominis muscles occurred approximately 50 ms after the onset of the limb perturbation that resulted from addition of the load early in the movement and was coincident with the onset of the observed perturbation at the trunk. The results provide evidence of initiation of a complex postural response of the trunk muscles that is consistent with mediation by afferent input from a site distant to the lumbar spine, which may include afferents of the upper limb.

Place, publisher, year, edition, pages
2001. Vol. 138, no 2, 243-50 p.
Identifiers
URN: urn:nbn:se:gih:diva-770PubMedID: 11417465OAI: oai:DiVA.org:gih-770DiVA: diva2:174550
Available from: 2009-02-23 Created: 2009-02-16 Last updated: 2011-05-03Bibliographically approved

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