Automatic tracking of medial gastrocnemius fascicle length during human locomotion

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Title Automatic tracking of medial gastrocnemius fascicle length during human locomotion
Author Cronin, Neil; Carty, Christopher Paul; Barrett, Rod; Lichtwark, Glen
Journal Name Journal of Applied Physiology
Year Published 2011
Place of publication United States
Publisher American Physiological Society
Abstract During human locomotion lower extremity muscle-tendon units undergo cyclic length changes that were previously assumed to be representative of muscle fascicle length changes. Measurements in cats and humans have since revealed that muscle fascicle length changes can be uncoupled from those of the muscle-tendon unit. Ultrasonography is frequently used to estimate fascicle length changes during human locomotion. Fascicle length analysis requires time consuming manual methods that are prone to human error and experimenter bias. To bypass these limitations, we have developed an automatic fascicle tracking method based on the Lucas-Kanade optical flow algorithm with an affine optic flow extension. The aims of this study were to compare gastrocnemius fascicle length changes during locomotion using the automated and manual approaches and to determine the repeatability of the automated approach. Ultrasound was used to examine gastrocnemius fascicle lengths in eight participants walking at 4, 5, 6, and 7 km/h and jogging at 7 km/h on a treadmill. Ground reaction forces and three dimensional kinematics were recorded simultaneously. The level of agreement between methods and the repeatability of the automated method were quantified using the coefficient of multiple correlation (CMC). Regardless of speed, the level of agreement between methods was high, with overall CMC values of 0.90 ± 0.09 (95% CI: 0.86–0.95). Repeatability of the algorithm was also high, with an overall CMC of 0.88 ± 0.08 (95% CI: 0.79–0.96). The automated fascicle tracking method presented here is a robust, reliable, and time-efficient alternative to the manual analysis of muscle fascicle length during gait.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1152/japplphysiol.00530.2011
Copyright Statement Self-archiving of the author-manuscript version is not yet supported by this journal. Please refer to the journal link for access to the definitive, published version or contact the author[s] for more information.
Volume 111
Issue Number 5
Page from 1491
Page to 1496
ISSN 0363-6143
Date Accessioned 2011-12-23; 2012-03-02T04:49:21Z
Date Available 2012-03-02T04:49:21Z
Research Centre Centre for Musculoskeletal Research; Griffith Health Institute
Faculty Griffith Health Faculty
Subject Biomechanics
URI http://hdl.handle.net/10072/43263
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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