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Assessment of intramuscular activation patterns using ultrasound M-mode strain
KTH, School of Technology and Health (STH), Medical Engineering.
Medicinsk Teknik - FoU, Umeå Universitet.
KTH, School of Technology and Health (STH), Medical Engineering.
Medicinsk Teknik - FoU, Umeå Universitet.
2013 (English)In: Journal of Electromyography & Kinesiology, ISSN 1050-6411, E-ISSN 1873-5711, Vol. 23, no 4, 879-885 p.Article in journal (Refereed) Published
Abstract [en]

The intramuscular activation pattern can be connected to the motor unit recruitment strategy of force generation and fatigue resistance. Electromyography has earlier been used in several studies to quantify the spatial inhomogeneity of the muscle activation. We applied ultrasound M-mode strain to study the activation pattern through the tissue deformation. Correlation values of the strain at different force levels were used to quantify the spatial changes in the activation. The assessment was done including the biceps brachii muscle of 8 healthy subjects performing isometric elbow flexion contractions ranging from 0% to 80% of maximum voluntary contraction. The obtained results were repeatable and demonstrated consistent changes of the correlation values during force regulation, in agreement with previously presented EMG-results. Both intra-subject and inter-subject activation patterns of strain were considered along and transverse the fiber direction. The results suggest that ultrasound M-mode strain can be used as a complementary method to study intramuscular activation patterns with high spatial resolution.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 23, no 4, 879-885 p.
Keyword [en]
Intramuscular activation, Recruitment strategies, Ultrasound, Strain, Biceps brachii
National Category
Medical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-122176DOI: 10.1016/j.jelekin.2013.02.011ISI: 000321107900019PubMedID: 23557977Scopus ID: 2-s2.0-84879550657OAI: oai:DiVA.org:kth-122176DiVA: diva2:621193
Funder
Swedish Research Council, VR 2007-3959
Note

QC 20130812

Available from: 2013-05-14 Created: 2013-05-14 Last updated: 2017-04-28Bibliographically approved
In thesis
1. Ultrasonic Quantification of Skeletal Muscle Dynamics: Feasibility and Limitations
Open this publication in new window or tab >>Ultrasonic Quantification of Skeletal Muscle Dynamics: Feasibility and Limitations
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Pain and disorders of the human skeletal muscles are one of the most common reasons for medical consultations in the western countries today and there is a great need to improve both the understanding and treatment of several different muscular conditions.

Techniques describing the muscle function in vivo are often limited by either their invasiveness or lack of spatial resolution. Electromyography (EMG) is the most common approach to assess the skeletal muscle function in vivo, providing information on the neurological input. However, the spatial resolution is in general limited and there are difficulties reaching deep musculature without using invasive needles. Moreover, it does not provide any information about muscle structure or mechanical aspects.

Quantitative ultrasound techniques have gained interest in the area of skeletal muscles and enables non-invasive and in-vivo insight to the intramuscular activity, through the mechanical response of the activation. However, these techniques are developed and evaluated for cardiovascular applications and there are important considerations to be made when applying these methods in the musculoskeletal field. 

This thesis is based on the work from four papers with the main focus to investigate and describe some of these considerations in combination with the development of processing and analyzing methods that can be used to describe the physiological characteristics of active muscle tissue.

In the first paper the accuracy of the Doppler based technique Tissue Velocity Imaging (TVI) was evaluated in a phantom study for very low tissue velocities and the effect of the pulse repetition frequency was considered. The second paper presents a biomechanical model to describe the TVI strain’s dependency on the muscle fiber pennation angle. In the third and fourth papers the intramuscular activity pattern was assessed through the regional tissue deformation by motion mode (M-mode) strain imaging. The activity patterns were analyzed during force regulation and for the effects of fatigue.

The work of this thesis show promising results for the application of these methods on skeletal muscles and indicate high clinical potential where quantitative ultrasound may be a valuable tool to reach a more multifaceted and comprehensive insight in the musculoskeletal function. However, the methodological considerations are highly important for the optimized application and further evaluation and development of analyzing strategies are needed.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. x, 54 p.
Series
Trita-STH : report, ISSN 1653-3836 ; 2013:4
Keyword
ultrasound, skeletal muscle, intramuscular, dynamics, Tissue Doppler Imaging, Speckle Tracking, strain, quantification
National Category
Medical Image Processing
Identifiers
urn:nbn:se:kth:diva-122233 (URN)978-91-7501-737-2 (ISBN)
Public defence
2013-06-05, sal 3-221, Alfred Nobels Allé 10, Huddinge, 13:00 (Swedish)
Opponent
Supervisors
Note

QC 20130516

Available from: 2013-05-16 Created: 2013-05-14 Last updated: 2013-05-16Bibliographically approved

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