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

Hoffman, B. W. ORCID: https://orcid.org/0000-0002-8408-6192 and Lichtwark, G. A. and 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. ISSN 8750-7587


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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 03 Sep 2021 04:34
Last Modified: 03 Sep 2021 04:36
Uncontrolled Keywords: force-length relationship; ultrasonography; muscle fascicle; torque- angle relationship
Fields of Research (2008): 11 Medical and Health Sciences > 1106 Human Movement and Sports Science > 110601 Biomechanics
Fields of Research (2020): 42 HEALTH SCIENCES > 4207 Sports science and exercise > 420701 Biomechanics
Identification Number or DOI: https://doi.org/10.1152/japplphysiol.00070.2012
URI: http://eprints.usq.edu.au/id/eprint/42105

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