A comparison of two Hill-type skeletal muscle models on the construction of medial gastrocnemius length-tension curves in humans in vivo

Article


Hoffman, B. W., Lichtwark, G. A., Carroll, T. J. and Cresswell, A. G.. 2012. "A comparison of two Hill-type skeletal muscle models on the construction of medial gastrocnemius length-tension curves in humans in vivo." Journal of Applied Physiology. 113 (1), pp. 90-96. https://doi.org/10.1152/japplphysiol.00070.2012
Article Title

A comparison of two Hill-type skeletal muscle models on the construction of medial gastrocnemius length-tension curves in humans in vivo

ERA Journal ID3161
Article CategoryArticle
AuthorsHoffman, B. W. (Author), Lichtwark, G. A. (Author), Carroll, T. J. (Author) and Cresswell, A. G. (Author)
Journal TitleJournal of Applied Physiology
Journal Citation113 (1), pp. 90-96
Number of Pages7
Year2012
PublisherAmerican Physiological Society
Place of PublicationUnited States
ISSN1522-1601
8750-7587
Digital Object Identifier (DOI)https://doi.org/10.1152/japplphysiol.00070.2012
Web Address (URL)https://journals.physiology.org/doi/full/10.1152/japplphysiol.00070.2012
Abstract

Human length-tension curves are traditionally constructed using a model that assumes passive tension does not change during contraction (model A) even though the animal literature suggests that passive tension can decrease (model B). The study's aims were threefold: 1) measure differences in human medial gastrocnemius length-tension curves using model A vs. model B, 2) test the reliability of ultrasound constructed length-tension curves, and 3) test the robustness of fascicle length-generated length-tension curves to variations between the angle and fascicle length relationship. An isokinetic dynamometer manipulated and measured ankle angle while ultrasound was used to measure medial gastrocnemius fascicle length. Supramaximal tibial nerve stimulation was used to evoke resting muscle twitches. Length-tension curves were constructed using model A {angle-torque [A-T(A)], length-torque [LT(A)]} or model B {length-torque [L-T(B)]} in three conditions: baseline, heel-lift (where the muscle was shortened at each angle), and baseline repeated 2 h later (+2 h). Length-tension curves constructed from model B differed from those produced via model A, indicated by a significant increase in maximum torque (∼23%) when using L-T(B) vs. L-T(A). No parameter measured was different between baseline and +2 h for any method, indicating good reliability when using ultrasound. Length-tension curves were unaffected by the heel-lift condition when using L-T(A) or L-T (B) but were affected when using A-T(A). Since the muscle model used significantly alters human length-tension curves, and given animal data indicate model B to be more accurate when passive tension is present, we recommend that model B should be used when constructing medial gastrocnemius length-tension curves in humans in vivo.

Keywordsforce-length relationship; ultrasonography; muscle fascicle; torque- angle relationship
ANZSRC Field of Research 2020420701. Biomechanics
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Byline AffiliationsUniversity of Queensland
Institution of OriginUniversity of Southern Queensland
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