Abstract：
:This research evaluated changes in surface electromyographic (SEMG) spike shape across different levels of isometric force. Ninety-six subjects generated three 5-s isometric step contractions of the elbow flexors at 40, 60, 80, and 100% of maximal voluntary contraction (MVC). Force and bipolar SEMG activity were monitored concurrently. The mean spike amplitude (MSA) exhibited a linear increase across the four levels of force. The mean spike frequency (MSF) remained stable from 40 to 80% of MVC; it then decreased from 80 to 100% of MVC. There was a concomitant increase in mean spike slope (MSS) that indicates that the biceps brachii (BB) relied on the recruitment of higher threshold motor units (MUs) from 40 to 80% of MVC. However, there progressive decrease in the mean number of peaks per spike (MNPPS) that suggests that MU synchronization was additionally required to increase force from 80 to 100% of MVC. The spike shape measures, taken together, indicate that the decrease in frequency content of the signal was due to synchronization, not an increased probability of temporal overlap due an increase in rate-coding.
journal_name
J Neurosci Methodsjournal_title
Journal of neuroscience methodsauthors
Gabriel DA,Lester SM,Lenhardt SA,Cambridge EDdoi
10.1016/j.jneumeth.2006.07.004subject
Has Abstractpub_date
2007-01-15 00:00:00pages
146-52issue
1eissn
0165-0270issn
1872-678Xpii
S0165-0270(06)00317-7journal_volume
159pub_type
杂志文章abstract：BACKGROUND:This article addresses the automatic classification of reconstructed neurons through their morphological features. The purpose was to extend the capabilities of the L-Measure software. METHODS:New morphological features were developed, based on modifications of the conventional Sholl analysis. The lengths o...
journal_title：Journal of neuroscience methods
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journal_title：Journal of neuroscience methods
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journal_title：Journal of neuroscience methods
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journal_title：Journal of neuroscience methods
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journal_title：Journal of neuroscience methods
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更新日期：2015-03-30 00:00:00
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