Triceps Surae Short Latency Stretch Reflexes Contribute to Ankle Stiffness Regulation during Human Running

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Title Triceps Surae Short Latency Stretch Reflexes Contribute to Ankle Stiffness Regulation during Human Running
Author Cronin, Neil; Carty, Christopher Paul; Barrett, Rod
Journal Name PLoS ONE
Year Published 2011
Place of publication United States
Publisher Public Library of Science
Abstract During human running, short latency stretch reflexes (SLRs) are elicited in the triceps surae muscles, but the function of these responses is still a matter of controversy. As the SLR is primarily mediated by Ia afferent nerve fibres, various methods have been used to examine SLR function by selectively blocking the Ia pathway in seated, standing and walking paradigms, but stretch reflex function has not been examined in detail during running. The purpose of this study was to examine triceps surae SLR function at different running speeds using Achilles tendon vibration to modify SLR size. Ten healthy participants ran on an instrumented treadmill at speeds between 7 and 15 km/h under 2 Achilles tendon vibration conditions: no vibration and 90 Hz vibration. Surface EMG from the triceps surae and tibialis anterior muscles, and 3D lower limb kinematics and ground reaction forces were simultaneously collected. In response to vibration, the SLR was depressed in the triceps surae muscles at all speeds. This coincided with short-lasting yielding at the ankle joint at speeds between 7 and 12 km/h, suggesting that the SLR contributes to muscle stiffness regulation by minimising ankle yielding during the early contact phase of running. Furthermore, at the fastest speed of 15 km/h, the SLR was still depressed by vibration in all muscles but yielding was no longer evident. This finding suggests that the SLR has greater functional importance at slow to intermediate running speeds than at faster speeds.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1371/journal.pone.0023917
Volume 6
Issue Number 8
Page from e23917-1
Page to e23917-6
ISSN 1932-6203
Date Accessioned 2011-08-23
Language en_AU
Research Centre Centre for Musculoskeletal Research; Griffith Health Institute
Faculty Griffith Health Faculty
Subject Biomechanics
URI http://hdl.handle.net/10072/41206
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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