zin
| 10:03 Nov 25, 2010 |
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| French to Dutch translations [PRO] Medical - Medical (general) / neuromyotonie | |||||||
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| 3 | Geen versnelde activering bij rekrutering en interferentiepatroon bij maximale contractie. |
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| Kleine handreiking: |
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| Discussion entries: 1 | |
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Answers
19 hrs confidence: 
Geen versnelde activering bij rekrutering en interferentiepatroon bij maximale contractie. Explanation: Voor een verklaring van de termen 'activering' en 'rekrutering' en een beschrijving van het interferentiepatroon dat optreedt bij maximale spiersamentrekking: zie reference comment. |
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Reference comments
12 hrs |
| Reference: Kleine handreiking: Reference information: Électromyogramme : « La détection étudie les potentiels émis par le muscle lors de contractions volontaires de celui-ci. On observe normalement quelques potentiels d'unités motrices battant à basse fréquence lors d'une contraction modérée et un phénomène de « recrutement » temporel et spatial lors d'une contraction plus forte (davantage d'unités motrices sont activées et battent à une fréquence plus élevée au fur et à mesure que l'effort est plus soutenu). » (http://fr.wikipedia.org/wiki/Électromyogramme) tracé d’interférence : « Tracé des courants d'action simultanés de plusieurs unités motrices durant la contraction du muscle. » (http://www.med.univ-rennes1.fr/sisrai/dico/2130.html) unité motrice : “Een zenuwcel en een spiervezel samen wordt een motoreenheid genoemd. Wanneer een zenuwcel geactiveerd wordt, zorgt deze ervoor dat alle spiervezels, die met die zenuwcel in contact staan, geactiveerd worden. Het aantal motoreenheden dat ingeschakeld wordt bij het samentrekken van een spier, is afhankelijk van de belasting die op die bepaalde spier wordt uitgeoefend.” (http://www.mannen-gezondheid.com/spieren.html) recrutering: “Een minstens even belangrijk tweede mechanisme dat de spierkracht regelt is varatie van het aantal motorische eenheden dat tegelijk in actie is. Dat gebeurt door meer of minder motorische neuronen te exciteren. Het in gang zetten van meer motor units (= rekrutering) gebeurt in een vaste volgorde.” (http://books.google.co.uk/books?id=pfAub87qRHQC&pg=PA145&lpg... -------------------------------------------------- Note added at 13 uren (2010-11-25 23:14:35 GMT) -------------------------------------------------- "Recruitment E. 1. versterking (recrutering), bijv. versterkte aanspanning van spieren als meer kracht nodig is" (Coëlho, Zakwoordenboek der geneeskunde, 24e druk, Arnhem 1993) -------------------------------------------------- Note added at 13 uren (2010-11-25 23:27:51 GMT) -------------------------------------------------- "Muscle tissue at rest is normally electrically inactive. After the electrical activity caused by the irritation of needle insertion subsides, the electromyograph should detect no abnormal spontaneous activity (i.e., a muscle at rest should be electrically silent, with the exception of the area of the neuromuscular junction, which is, under normal circumstances, very spontaneously active). When the muscle is voluntarily contracted, action potentials begin to appear. As the strength of the muscle contraction is increased, more and more muscle fibers produce action potentials. When the muscle is fully contracted, there should appear a disorderly group of action potentials of varying rates and amplitudes (a complete recruitment and interference pattern)." (http://en.wikipedia.org/wiki/Electromyography) -------------------------------------------------- Note added at 19 uren (2010-11-26 05:20:56 GMT) -------------------------------------------------- “Motor Unit Recruitment in EMG Definition of Motor Unit Recruitment and Overview Motor unit recruitment may be defined as "the successive activation of the same and additional motor units with increasing strength of voluntary muscle contraction. [...] Recruitment With Maximal Volitional Effort: Interference Pattern Analysis With increasing effort, the firing frequency of individual motor units increases and progressively more and larger units are activated. In a healthy subject providing maximal voluntary effort of the muscle under investigation, the action potentials of individual motor units no longer can be separated from each other but are mixed with the signals of other units. The recruitment pattern with maximal voluntary contraction is called "interference pattern" because of the increasing degree of superimposition of action potentials from different units. With increasing force, the EMG becomes continuously denser and the maximal peaks in the signal have a higher amplitude.” (http://emedicine.medscape.com/article/1141359-overview) -------------------------------------------------- Note added at 19 uren (2010-11-26 05:26:02 GMT) -------------------------------------------------- Versnelde recrutering: "Door de verminderde kracht per motor unit (door uitval van spiervezels en mogelijk stoornissen in het contractiele mechanisme) worden al bij lage krachtnivo’s veel motor units gerekruteerd (versnelde rekrutering)." (http://www.nvknf.nl/consensus/Myopathie/EMGMyopathieConsensu... |
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