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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
8
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pubmed:dateCreated |
1997-8-26
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pubmed:abstractText |
Decomposition-enhanced spike-triggered averaging (DE-STA) was applied to the vastus medialis muscle to examine size distributions of surface-detected motor-unit action potentials (S-MUAPs) at various force levels. Using DE-STA, 15-20 S-MUAPs were identified during 5%, 10%, 20%, and 30% of maximum voluntary contraction. Average S-MUAPs showed increase in peak to peak (and negative peak) amplitude with force (In microV): 5% = 37.9 +/- 6.1 (16.6 +/- 2.5), 10% = 44.0 +/- 4.0 (20.4 +/- 1.8), 20% = 80.7 +/- 9.3 (41.3 +/- 4.5), and 30% = 102.5 +/- 10.3 (53.6 +/- 5.0). Test-retest variability of peak to peak (and negative peak amplitude) between repeated trials was 0.10 (0.14), 0.14 (0.14), 0.17 (0.15), and 0.21 (0.20) at 5%, 10%, 20%, and 30% respectively. A relationship was found between the S-MUAP amplitude and force (r2 = 0.78, df = 90, F = 160, P < 0.001). Increase in average S-MUAP amplitude with force suggests that STA performed only at low levels of contraction may result in a biased sampling and small average S-MUAP amplitudes.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:status |
MEDLINE
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pubmed:month |
Aug
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pubmed:issn |
0148-639X
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
20
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
976-82
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pubmed:dateRevised |
2004-11-17
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pubmed:meshHeading |
pubmed-meshheading:9236788-Action Potentials,
pubmed-meshheading:9236788-Adult,
pubmed-meshheading:9236788-Aged,
pubmed-meshheading:9236788-Electromyography,
pubmed-meshheading:9236788-Humans,
pubmed-meshheading:9236788-Middle Aged,
pubmed-meshheading:9236788-Muscle, Skeletal,
pubmed-meshheading:9236788-Muscle Contraction,
pubmed-meshheading:9236788-Reproducibility of Results,
pubmed-meshheading:9236788-Sample Size
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pubmed:year |
1997
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pubmed:articleTitle |
Decomposition-enhanced spike-triggered averaging: contraction level effects.
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pubmed:affiliation |
Department of Neurology, Johns Hopkins Bayview Medical Center, Baltimore, Maryland 21224, USA.
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pubmed:publicationType |
Journal Article
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