Publication
Motor unit behavior during submaximal contractions following six weeks of either endurance or strength training
| dc.contributor.author | Vila-Chã, Carolina | |
| dc.contributor.author | Falla, Deborah | |
| dc.contributor.author | Farina, Dario | |
| dc.date.accessioned | 2011-05-30T13:49:54Z | |
| dc.date.available | 2011-05-30T13:49:54Z | |
| dc.date.issued | 2010 | |
| dc.description.abstract | The study investigated changes in motor output and motor unit behavior following 6 weeks of either strength or endurance training programs commonly used in conditioning and rehabilitation. Twenty-eight sedentary healthy men (age, mean±SD, 26.1 ± 3.9 yrs) were randomly assigned to strength training (ST) (n = 9), endurance training (ET) (n = 10) or a control group (CT) (n = 8). Maximum voluntary contraction (MVC), time to task failure (isometric contraction at 30% MVC), and rate of force development (RFD) of the quadriceps, were measured before (week 0), during (week 3), and after a training program of 6 weeks. In each experimental session, surface and intramuscular EMG signals were recorded from the vastus medialis obliquus (VMO) and vastus lateralis (VL) muscles during isometric knee extension at 10% and 30% MVC. After 6 weeks of training, MVC and RFD increased in the ST group (17.5±7.5 % and 33.3±15.9 %, respectively; P < 0.05) whereas time to task failure was prolonged in the ET group (29.7±13.4 %; P < 0.05). Despite surface EMG amplitude during 30% MVC contractions increased following both training programs, there were different changes in motor unit discharge rates between the training groups. After endurance training, the motor unit discharge rate at 30% MVC decreased from 11.3 ±1.3 pulses per second (pps) to 10.1 ± 1.1 pps (P < 0.05) in the vasti muscles, whereas after strength training it increased from 11.4 ± 1.2 pps to 12.7 ± 1.3 pps (P < 0.05). Finally, motor unit conduction velocity during the contractions at 30% MVC increased for both the ST and ET groups, but only after 6 weeks of training (P < 0.05). In conclusion, strength and endurance training programs elicit opposite adjustments in motor unit discharge rates but similar changes in muscle fiber conduction velocity. | por |
| dc.description.sponsorship | Fundação para a Ciência e a Tecnologia (FCT) of Portugal (Grant ID - SFRH / BD / 31796 / 2006). Danish Technical Research Council | por |
| dc.identifier.citation | Vila-Chã, Carolina; Falla, Deborah; Farina, Dario (2010). Motor unit behavior during submaximal contractions following six weeks of either endurance or strength training. Journal of Applied of Physiology. Journal of Applied of Physiology. ISSN 8750-7587. 109:5, p. 1455-1466 | por |
| dc.identifier.issn | 8750-7587 | |
| dc.identifier.uri | http://hdl.handle.net/10198/4716 | |
| dc.language.iso | eng | por |
| dc.peerreviewed | yes | por |
| dc.publisher | American Physiological Society | por |
| dc.relation.ispartofseries | 109;5 | |
| dc.relation.publisherversion | http://jap.physiology.org/content/109/5/1455.abstract | por |
| dc.subject | Motor unit | por |
| dc.subject | Motor training | por |
| dc.subject | Surface electromyography | por |
| dc.title | Motor unit behavior during submaximal contractions following six weeks of either endurance or strength training | por |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 1466 | por |
| oaire.citation.startPage | 1455 | por |
| oaire.citation.title | Journal of Applied of Physiology | por |
| person.familyName | Vila-Chã | |
| person.givenName | Carolina | |
| person.identifier.orcid | 0000-0003-3891-357X | |
| person.identifier.scopus-author-id | 35079532100 | |
| rcaap.rights | openAccess | por |
| rcaap.type | article | por |
| relation.isAuthorOfPublication | 2fd32019-b368-4f10-a577-a5b651c044c2 | |
| relation.isAuthorOfPublication.latestForDiscovery | 2fd32019-b368-4f10-a577-a5b651c044c2 |
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