NDLI: Using spike-triggered averaging to characterize motor unit twitch vectors in the first dorsal interosseous

Content Provider	IEEE Xplore Digital Library
Author	Suresh, N. Kuo, A. Heckman, C.J. Rymer, W.Z.
Copyright Year	2012
Description	Author affiliation: Rehabilitation Inst. of Chicago, Chicago, IL, USA (Rymer, W.Z.) \|\| Dept. of Physiol., Northwestern Univ., Chicago, IL, USA (Heckman, C.J.) \|\| Sensory Motor Performance Program, Rehabilitation Inst. of Chicago, Chicago, IL, USA (Suresh, N.) \|\| Dept. of Mech. Eng., Univ. of Michigan, Ann Arbor, MI, USA (Kuo, A.)
Abstract	Earlier studies in multifunctional muscles such as the first dorsal interosseous (FDI) have demonstrated that the selection and control of motor units (MUs) can vary as a function of generated force direction. While directionally dependent motor unit recruitment and rate properties imply that there may also be differential mechanical action, this has yet to be directly demonstrated. Our objective was to determine whether there exists a range of force vectors from different motor units in the FDI muscle within individual subjects. We utilized the spike-triggered averaging (STA) method to derive force twitch estimates from single motor units. We derived MU twitch direction from the ratio of individual twitch estimates recorded concurrently from the load cell. Fifteen units from 2 subjects were used to determine MU force vectors. We were able to estimate force twitch vectors from 7-8 different MUs in each subject. The results of our study suggest that there is varied mechanical action of motor units in the FDI. It is thus possible that differential activation of individual MUs in the FDI is a function of varied mechanical action.
Sponsorship	IEEE Eng. Medicine Biol. Soc.
Starting Page	3604
Ending Page	3607
File Size	801152
Page Count	4
File Format	PDF
ISBN	9781424441198
ISSN	1557170X
e-ISBN	9781457717871
DOI	10.1109/EMBC.2012.6346746
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-08-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Force Vectors Muscles Firing Recruitment Humans Educational institutions twitch force motor unit spike-triggered averaging motor unit twitch first dorsal interosseous
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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