Research article summary (published 30 Oct 1994):

Two strategies of transferring from sit-to-stand; the activation of monoarticular and biarticular muscles.

Full Abstract

In this study, two different strategies of rising from a chair were compared, using integrated biomechanical and electromyographic analyses. Nine healthy subjects were instructed to rise using two different strategies: natural sit-to-stand transfer (NSTS) and a sit-to-stand transfer with full flexion of the trunk (FSTS). Sagittal kinematics and ground reaction forces were registered. Muscle activity of nine muscles of the right leg were recorded by means of surface EMG. All signals were synchronized at seat-off. The results show that no differences occur between the kinematics of knee and ankle, whereas the hip flexion is, as expected, higher during FSTS. The higher moment about the knee during NSTS is shifted to proportionally higher moments about the hip and ankle during FSTS. It is mainly the differences in the EMG-levels of the biarticular hip and knee muscles which might explain the differences in net moment. These results are in accordance with a theory about a particular role of biarticular muscles. On the other hand, the shift from knee to ankle cannot be associated with a particular increase in activity of the biarticular m.gastrocnemius. It is hypothesized that about the ankle, control of stability is preferred over movement control. An important conclusion for rehabilitation medicine is that a lower net moment about the knee in FSTS does not automatically imply that this reduces the load on the knee extensors.

Author information

Author/s: Doorenbosch, C A (CA); Harlaar, J (J); Roebroeck, M E (ME); Lankhorst, G J (GJ);

Affiliation: Department of Rehabilitation Medicine, Free University Hospital, Amsterdam, The Netherlands.

Journal and publication information

Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't

Journal: Journal of biomechanics (J Biomech), published in UNITED STATES. (Language: eng)

Reference: 1994-Nov; vol 27 (issue 11) : pp 1299-307

Dates: Created 1995/01/26; Completed 1995/01/26; Revised 2006/11/15;

PMID: 7798280, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult Ankle Joint - physiology Biomechanics Electromyography Female Hip Joint - physiology Humans Isometric Contraction - physiology Joints - physiology Knee Joint - physiology

Knee Joint - physiology Leg - physiology Male Models, Biological Movement - physiology Muscle, Skeletal - physiology Posture - physiology Rotation Stress, Mechanical Weight-Bearing - physiology

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