Name: determining the electromyographic fatigue threshold following a single visit exercise test
Uploaded: 2015-07-27T14:00:00
Description: Watch this Scientific Journal Video about Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test at JoVE.com

This project was funded by, in part, by start-up funds from Wayne State University to M.H. Malek.

Alle procedurer blev godkendt af University Institutional Review Board for mennesker. 1. Forberedelse af deltagerens Leg <ol><li> Har deltageren pænt rulle op deres shorts til den ønskede ben. Så tape shorts, så quadriceps femoris muskel gruppe er eksponeret og trække en linje omkring området deltageren har brug for at barbere. </li><li> VIGTIGT: Have deltageren barbere deres ben før testen i stedet for den foregående dag, da dette sikrer, at der ikke er nogen skægstubbene, som ka...

<ol>
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J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Muscles alive, their functions revealed by electromyography. , (1985).</li><li>Vries, H. A., Moritani, T., Nagata, A., Magnussen, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+relation+between+critical+power+and+neuromuscular+fatigue+as+estimated+from+electromyographic+data.">The relation between critical power and neuromuscular fatigue as estimated from electromyographic data.</a> Ergonomics. 25, 783-791 (1982).</li><li>Vries, H. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+method+for+estimating+physical+working+capacity+at+the+fatigue+threshold+(PWCFT).">A method for estimating physical working capacity at the fatigue threshold (PWCFT).</a> Ergonomics. 30, 1195-1204 (1987).</li><li>Vries, H. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Factors+affecting+the+estimation+of+physical+working+capacity+at+the+fatigue+threshold.">Factors affecting the estimation of physical working capacity at the fatigue threshold.</a> Ergonomics. 33, 25-33 (1990).</li><li>Astrand, I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+physical+work+capacity+of+workers+50-64+years+old.">The physical work capacity of workers 50-64 years old.</a> Acta physiologica Scandinavica. 42, 73-86 (1958).</li><li>Hettinger, T., Birkhead, N. C., Horvath, S. M., Issekutz, B., Rodahl, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Assessment+of+physical+work+capacity.">Assessment of physical work capacity.</a> Journal of Applied Physiology. 16, 153-156 (1961).</li><li>Smith, J. L., Karwowsk, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> International encyclopedia of ergonomics and human factors. , (2006).</li><li>Kenny, G. P., Yardley, J. E., Martineau, L., Jay, O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Physical+work+capacity+in+older+adults:+implications+for+the+aging+worker.">Physical work capacity in older adults: implications for the aging worker.</a> American journal of industrial medicine. 51, 610-625 (2008).</li><li>Matsumoto, T., Ito, K., Moritani, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+relationship+between+anaerobic+threshold+and+electromyographic+fatigue+threshold+in+college+women.">The relationship between anaerobic threshold and electromyographic fatigue threshold in college women.</a> European journal of applied physiology. 63, 1-5 (1991).</li><li>Guffey, D. R., Gervasi, B. J., Maes, A. A., Malek, M. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Estimating+electromygraphic+and+heart+rate+fatigue+threshold+from+a+single+treadmill+test.">Estimating electromygraphic and heart rate fatigue threshold from a single treadmill test.</a> Muscle. 46, 577-581 (2012).</li><li>Camic, C. L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+influence+of+the+muscle+fiber+pennation+angle+and+innervation+zone+on+the+identification+of+neuromuscular+fatigue+during+cycle+ergometry.">The influence of the muscle fiber pennation angle and innervation zone on the identification of neuromuscular fatigue during cycle ergometry.</a> Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology. 21, 33-40 (2011).</li></ol>

Vi her præsenterer en metode til bestemmelse af neuromuskulær træthed i quadriceps femoris muskler til dynamisk øvelse. Denne fremgangsmåde tilvejebringer en enkel og ikke-invasiv metode til ved hjælp af overflade EMG. Desuden alsidigheden ved denne metode er, at forskerne kan tilpasse det til andre transportformer motion som løbebånd 20. Teoretisk, for intensiteter på eller under EMG træthed tærsklen deltageren skal kunne opretholde øvelsen workbout ubestemt tid ...

Overflade elektromyografi (EMG) er en ikke-invasiv metode studere motorenhed rekruttering under isometrisk 1-3, isokinetisk 4-6, eller kontinuerlig 7-10 muskel handling. Amplituden af EMG signal repræsenterer muskel aktivering, som består af antallet af motoriske enheder aktiveres, afbrændingstakten af de motoriske enheder eller begge 11. Begrebet EMG træthed tærskel anvendes til at indikere den højeste arbejdsbyrde i hvilken en person kan udøve på ubestemt tid uden en stigning i EMG amplitude 8. Det er vigtigt at kortvarigt diskussion oprindelsen af ​​EMG træthed tærskel. Den oprindelige undersøgelse fra Vries et al. 12 involverede en protokol, der bestod af flere (normalt 3-4) diskontinuerlige arbejde anfald, hvor EMG amplitude blev plottet mod tid for hver arbejde kamp. Udgangseffekten blev derefter plottes versus hældning koefficienter fra EMG amplitude versus tid rela<html> hæng, og derefter ekstrapoleret til nul hældning (y-skæringspunkt) 12. Forfatterne 12 oprindeligt kaldt denne protokol den fysiske arbejdskapacitet på tærsklen træthed (PWCFT). I en anden undersøgelse, de Vries et al. 13 anvendes ofte afbrudte anfald, men anvendes lineær regression for at finde den første effekt, der resulterede i en betydelig hældning for EMG amplitude versus tid forhold. Forfatterne 13 også kaldet protokollen den PWCFT, skaber en vis forvirring i litteraturen. I en efterfølgende artikel, de Vries et al. 14 ændret deres tidligere protokol 13 og udviklet en kontinuerlig inkrementel protokol. EMG amplitude blev plottet mod tiden for hver udgangseffekt og den PWCFT blev defineret som gennemsnittet af den højeste effekt, der resulterede ikke i nogen ændring i EMG amplitude over tid og den laveste effekt, der resulterede i en stigning i EMG amplitude over tid 14 . ent &quot;&gt; Det skal bemærkes, at udtrykket PWC blev oprindeligt introduceret i slutningen af 1950&#39;erne 15,16 og er synonymt med et væld af litteratur (fortid, nutid, og på tværs af forskellige lande) undersøgelse aerobe kapacitet ved en given belastning 17. Desuden begrebet bruges i det ergonomiske og industrielle litteratur, som fokuserer på dag-til-dag produktivitet arbejdstagere, der udfører gentagne handlinger under otte timer arbejdsdage som individer i en samlefabrik 18. Udtrykket EMG træthed tærskel blev oprindeligt anvendt af Matsumoto og kolleger 19, efter at de ændret Vries 12 protokol, hvor udgangseffekten versus hældning koefficienterne for EMG amplitude versus tid forholdet plottes og ekstrapoleres til det punkt nul hældning. For nylig, Guffey et al. 20 og Briscoe et al. 8 anvendes fremgangsmåden ifølge de Vries et al. 14 og terminologi Matsumoto et enl. 19 til operationelt definere EMG træthed tærskel. Bevæger sig fremad, anbefaler vi, at udtrykket EMG træthed tærskel anvendes. Således er EMG amplitude versus tid forholdet afbildet for hver effekt og derefter analyseret ved anvendelse af lineære regressionsanalyser (figur 1). For at estimere EMG træthed tærskel, den højeste effekt med en ikke-signifikant (p&gt; 0,05) hældning og den laveste effekt med en signifikant (p &lt;0,05) hældning er identificeret og derefter gennemsnittet beregnes 14. Denne protokol er enkel, praktisk og afsluttet inden for 15-20 min. Desuden kan den trinvise sats moduleres baseret på den enkeltes niveau af sædvanlige fysisk aktivitet, og derfor har potentielle anvendelsesmuligheder i kliniske indstillinger.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>839 E Monark cycle ergometer&#160;</td>
			<td>Monark Exercise AB</td>
			<td>839 E</td>
			<td></td>
		</tr>
		<tr>
			<td>Heart rate monitor</td>
			<td>Polar</td>
			<td>Polar H1</td>
			<td></td>
		</tr>
		<tr>
			<td>Laptop</td>
			<td>Dell Inspiron</td>
			<td>varies</td>
			<td>any laptop computer with USB slots should work.</td>
		</tr>
		<tr>
			<td>EMG amplifiers</td>
			<td>BioPac Systems, Inc.</td>
			<td>100B</td>
			<td>100C are the latest version</td>
		</tr>
		<tr>
			<td>Disposable EMG electrodes</td>
			<td>BioPac Systems, Inc.</td>
			<td>EL-500</td>
			<td></td>
		</tr>
		<tr>
			<td>Sandpaper</td>
			<td>Home Depot</td>
			<td>9 in. x 11 in. 60 Grit course no-slip grip Advanced Sandpaper (3-Pack)</td>
			<td></td>
		</tr>
	</tbody>
</table>

determining the electromyographic fatigue threshold following a single visit exercise test

Teoretisk er den elektromyografisk (EMG) træthed grænse er den træningsintensitet en person kan opretholde det uendelige uden behovet for at rekruttere flere motoriske enheder, som er forbundet med en stigning i EMG amplitude. Selvom forskellige protokoller er blevet anvendt til at estimere EMG træthed tærskel de kræver flere besøg, som er upraktisk for et klinisk miljø. Her præsenterer vi en protokol til at estimere EMG træthed tærsklen for cyklus ergometri som kræver et enkelt besøg. Denne protokol er enkel, praktisk, og afsluttes inden for 15-20 min, derfor har potentialet til at blive oversat til et værktøj, som klinikere kan bruge i motion recept.

Som vist i figur 1, for en enkelt deltager, hver udgangseffekt, der er fuldført har seks datapunkter, der repræsenterer EMG amplitude for vastus lateralis musklen. Derfor, i dette eksempel, den højeste effekt med en ikke-signifikant (p&gt; 0,05) hældningen er 200 watt, mens den laveste effekt med en signifikant (p &lt;0,05) hældningen er 225 W. Derfor for denne deltager EMG træthed grænse er 213 W. Når EMG træthed tærsklen bestemmes for hver deltager så Empiriske statistikke...

Watch this Scientific Journal Video about Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test at JoVE.com

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test

This protocol describes the electromyographic fatigue threshold which demarcates between nonfatiguing and fatiguing exercise workloads. This information could be used to develop a more individualized training program.

Bestemmelse af Elektromyografisk Træthed Threshold Efter et enkelt besøg Motion Test

Theoretically, the electromyographic (EMG) fatigue threshold is the exercise intensity an individual can maintain indefinitely without the need to recruit ...

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