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Muscular force production after concentric contraction
KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.ORCID iD: 0000-0002-5819-4544
2008 (English)In: Journal of Biomechanics, ISSN 0021-9290, E-ISSN 1873-2380, Vol. 41, no 11, 2422-2429 p.Article in journal (Refereed) Published
Abstract [en]

The steady-state force following active shortening does not reach the maximum isometric force associated with the final length. Isolated extensor digitorum longus and soleus muscles from mice (NMRI strain) were used to investigate the force produced by a muscle, and some parameters hypothetically influencing this shortening-induced force depression. The muscles were pre-stimulated at fixed length, shortened and then held isometrically to give maximum post-shortening forces, before de-stimulation. The shortening magnitude was 0.18. 0.36 or 0.72 mm (about 2-7% of optimal length), time of shortening was chosen as 0.03, 0.06 and 0.12 s, and final length as +0.72. 0 and -0.72mm, related to optimal length. The mechanical work during active shortening was evaluated by integrating the product of force and shortening velocity over the shortening period. The results show a positive correlation between the force depression and the mechanical work. whereas the force depression was not correlated to the velocity of shortening. Depression of the passive force component was also observed following all stimulations. Experiments show that the fully stimulated redevelopment of isometric force following concentric contraction follows a time function similar to the creation of force when isometric muscle is initially stimulated. The conclusion is that the isometric force development after active shortening can be well described by an asymptotic force which is decided by the produced work, and the initial isometric time constant.

Place, publisher, year, edition, pages
2008. Vol. 41, no 11, 2422-2429 p.
Keyword [en]
mouse muscles, concentric contractions, force depression, history, dependence, muscular work, cat soleus muscle, skeletal-muscle, length relationship, isometric, force, descending-limb, frog-muscle, depression, enhancement, stretch, relaxation
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-17816DOI: 10.1016/j.jbiomech.2008.05.019ISI: 000259129000012Scopus ID: 2-s2.0-48149107349OAI: oai:DiVA.org:kth-17816DiVA: diva2:335861
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Muscular force production during non-isometric contractions: Towards numerical muscle modeling
Open this publication in new window or tab >>Muscular force production during non-isometric contractions: Towards numerical muscle modeling
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The main objective of the study was to investigate skeletal muscle force production during isometric contractions, active muscle stretches and shortenings. The motivation behind this work is to improve the dominant model of muscle contraction force generation based on the theories of Hill. The effect of force modification was observed after concentric and eccentric contractions and also stretch-shortening cycles. It has been shown that this force modification is not related to lengthening/shortening velocity, and the steady-state force after non-isometric contractions can be well described by initial isometric force and mechanical work performed by and on the muscle during length variations. The time constants calculated for isometric force redevelopment appeared to be in certain relations with those for initial isometric force development, an observation which extended our basis for ongoing muscle modeling. The main method of the project consists in two extensive series of experiments on mouse skeletal muscles. Analysis of the first series of experiments, concentric contractions, with an emphasis on the force depression has been presented in Paper 1. Paper 2 is based on contractions with various stretches and shortenings as well as their combination, force modification and its predictor are the quantities of interest. The third part of the project is also based on the second series of experiments. Timing aspects of the force production were calculated there.

Place, publisher, year, edition, pages
Stockholm: Universitetsservice US-AB, 2009. x, 42 p.
Series
Trita-MEK, ISSN 0348-467X ; 2009:07
Keyword
Mouse skeletal muscle. Transient-length contractions. Muscular force. Force modification. History effect. Muscle modelling.
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-10672 (URN)
Presentation
2009-06-11, E51, KTH, Osquars backe 14, Stockholm, 13:30 (English)
Opponent
Supervisors
Note
QC 20120209Available from: 2009-06-22 Created: 2009-06-17 Last updated: 2012-02-09Bibliographically approved
2. Modelling of muscular force induced by non-isometric contraction
Open this publication in new window or tab >>Modelling of muscular force induced by non-isometric contraction
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The main objective of the study was to investigate and simulate skeletal muscleforce production during and after isometric contractions, active muscle lengtheningand active muscle shortening. The motivation behind this work was to improve thedominant model of muscle force generation based on the theories of Hill from 1938. Effects of residual force enhancement and force depression were observed after concentric and eccentric contractions, and also during stretch-shortening cycles. It wasshown that this force modification is not related to lengthening/shortening velocity, butinstead the steady-state force after non-isometric contractions can be well describedby an initial isometric force to which a modification is added. The modification isevaluated from the mechanical work performed by and on the muscle during lengthvariations. The time constants calculated for isometric force redevelopment appearedto be in certain relations with those for initial isometric force development, an observation which extended our basis for muscle modelling.

A macroscopic muscular model consisting of a contractile element, and paralleland series elastic elements was supplemented with a history component and adoptedfor mouse soleus muscle experiments. The parameters from the experiment analysis, particularly the force modification after non-isometric contractions and the timeconstants, were reproduced by the simulations. In a step towards a general implementation, the history modification was introduced in the muscluloskeletal model ofOpenSim software, which was then used for simulations of full body movements.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. x, 48 p.
Series
Trita-MEK, ISSN 0348-467X ; 2012:03
Keyword
Skeletal muscle, Muscular force, Concentric contractions, Eccentric con- tractions, History effect, Force modification, Muscle model, Musculoskeletal model
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-95418 (URN)978-91-7501-399-8 (ISBN)
Public defence
2012-05-31, E2, Lindstedtsvägen 3, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20120525Available from: 2012-05-25 Created: 2012-05-24 Last updated: 2012-05-25Bibliographically approved

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