NDLI: A novel muscle synergy extraction method to explain the equilibrium-point trajectory and endpoint stiffness during human upper-limb movements on a horizontal plane

Content Provider	IEEE Xplore Digital Library
Author	Uno, K. Oku, T. Phatiwuttipat, P. Koba, K. Yamashita, Y. Murakami, K. Uemura, M. Hirai, H. Miyazaki, F.
Copyright Year	2014
Description	Author affiliation: Dept. of Mech. Sci. & Bioeng., Osaka Univ., Toyonaka, Japan (Uno, K.; Oku, T.; Phatiwuttipat, P.; Koba, K.; Yamashita, Y.; Murakami, K.; Uemura, M.; Hirai, H.; Miyazaki, F.)
Abstract	Based on the idea of synergy to explore the building blocks of movements, this study focused on the muscle space for reaching movements by human upper limbs on a horizontal plane to estimate the relationship among muscle synergies, equilibrium-point (EP) trajectories, and endpoint stiffness in two ways: (1) a novel estimation method that analyzes electromyographic signals under the concept of agonist-antagonist (A-A) muscle pairs and (2) a conventional estimation method that uses mechanical perturbations. The experimental results suggest that (1) muscle activities of reaching movements by human upper limbs are represented by only three functional muscle synergies; (2) each muscle synergy balances the coacti-vations of A-A muscle pairs; (3) two of the muscle synergies are invariant bases that form an EP trajectory described in polar coordinates centered on a shoulder joint, where one is a composite unit for radial movement and the other is for angular movement; and (4) the third muscle synergy is the invariant basis for additional adjustment of the endpoint stiffness and has some influence on the direction and size of the endpoint stiffness ellipse.
Starting Page	621
Ending Page	626
File Size	441784
Page Count	6
File Format	PDF
ISBN	9781479931262
ISSN	21551774
e-ISBN	9781479931286
DOI	10.1109/BIOROB.2014.6913847
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-08-12
Publisher Place	Brazil
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Perturbation methods Shoulder Muscles Electromyography Vectors Trajectory Joints
Content Type	Text
Resource Type	Article

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