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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
2
|
| pubmed:dateCreated |
1997-4-22
|
| pubmed:abstractText |
The purpose of this investigation was to examine the effects of velocity of contraction on the mechanomyographic (MMG) responses to maximal concentric isokinetic leg extension movements. Eight adult males [mean (SD) age, 22.3 (1.3) years] performed maximal leg extensions on a calibrated Cybex 6000 dynamometer at velocities of 60, 120, 180, 240, 300, and 360 degrees x s(-1) x MMG responses were detected by a piezoelectric recording device placed over the vastus lateralis muscle. Intraclass reliability correlations ranged from R = 0.84 to 0.97 and from 0.90 to 0.99 for peak torque and MMG amplitude values, respectively, with no significant differences (P > 0.05) between the mean values for test versus retest at any contraction velocity. There were significant differences (P < 0.05) in peak torque at all velocities except 240 [135 (27) Nm] versus 300 [127 (27) Nm], and 300 versus 360 degrees x s(-1) [115 (37) Nm]. The mean MMG amplitude at 60 degrees x s(-1) [61 (67) mV] was significantly less (P < 0.05) than that at 360 degrees x s(-1) [452 (451) mV]. These results indicate a velocity-related dissociation between MMG amplitude and peak torque. Furthermore, it was hypothesized that the increases in MMG amplitude were due to velocity-related decreases in muscle stiffness which allowed for greater muscle fiber oscillations.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:status |
MEDLINE
|
| pubmed:issn |
0301-5548
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
75
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
166-9
|
| pubmed:dateRevised |
2004-11-17
|
| pubmed:meshHeading |
pubmed-meshheading:9118983-Adult,
pubmed-meshheading:9118983-Electromyography,
pubmed-meshheading:9118983-Humans,
pubmed-meshheading:9118983-Isometric Contraction,
pubmed-meshheading:9118983-Kinetics,
pubmed-meshheading:9118983-Male,
pubmed-meshheading:9118983-Movement,
pubmed-meshheading:9118983-Muscle Contraction
|
| pubmed:year |
1997
|
| pubmed:articleTitle |
Mechanomyographic responses to concentric isokinetic muscle contractions.
|
| pubmed:affiliation |
Center for Youth Fitness and Sports Research, School of Health and Human Performance, University of Nebraska-Lincoln, 68588-0229, USA.
|
| pubmed:publicationType |
Journal Article
|