NDLI: 3D curvature of muscle fascicles in triceps surae

Content Provider	PubMed Central
Author	Rana, Manku Ghassan, Hamarneh Wakeling, James M.
Copyright Year	2014
Abstract	Muscle fascicles curve along their length, with the curvatures occurring around regions of high intramuscular pressure, and are necessary for mechanical stability. Fascicles are typically considered to lie in fascicle planes that are the planes visualized during dissection or two-dimensional (2D) ultrasound scans. However, it has previously been predicted that fascicles must curve in three-dimensional (3D) and thus the fascicle planes may actually exist as 3D sheets. 3D fascicle curvatures have not been explored in human musculature. Furthermore, if the fascicles do not lie in 2D planes, then this has implications for architectural measures that are derived from 2D ultrasound scans. The purpose of this study was to quantify the 3D curvatures of the muscle fascicles and fascicle sheets within the triceps surae muscles and to test whether these curvatures varied among different contraction levels, muscle length, and regions within the muscle. Six male subjects were tested for three torque levels (0, 30, and 60% maximal voluntary contraction) and four ankle angles (−15, 0, 15, and 30° plantar flexion), and fascicles were imaged using 3D ultrasound techniques. The fascicle curvatures significantly increased at higher ankle torques and shorter muscle lengths. The fascicle sheet curvatures were of similar magnitude to the fascicle curvatures but did not vary between contractions. Fascicle curvatures were regionalized within each muscle with the curvature facing the deeper aponeuroses, and this indicates a greater intramuscular pressure in the deeper layers of muscles. Muscle architectural measures may be in error when using 2D images for complex geometries such as the soleus.
Related Links	http://dx.doi.org/10.1152/japplphysiol.00109.2013
Ending Page	1397
Page Count	10
Starting Page	1388
File Format	PDF
ISSN	87507587
e-ISSN	15221601
Journal	Journal of Applied Physiology
Issue Number	11
Volume Number	117
Language	English
Publisher	American Physiological Society
Publisher Date	2014-12-01
Access Restriction	Open
Rights Holder	American Physiological Society
Subject Keyword	Physiology (medical) Physiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Sports Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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