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dc.contributor.author
Froyd, Christian
dc.contributor.author
Beltrami, Fernando G.
dc.contributor.author
Millet, Guillaume Y.
dc.contributor.author
Noakes, Timothy D.
dc.date.accessioned
2019-08-20T13:07:53Z
dc.date.available
2017-06-12T16:19:21Z
dc.date.available
2019-08-20T13:07:53Z
dc.date.issued
2016-12
dc.identifier.issn
1664-042X
dc.identifier.other
10.3389/fphys.2016.00627
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/122873
dc.identifier.doi
10.3929/ethz-b-000122873
dc.description.abstract
It has been proposed that group III and IV muscle afferents provide inhibitory feedback from locomotor muscles to the central nervous system, setting an absolute threshold for the development of peripheral fatigue during exercise. The aim of this study was to test the validity of this theory. Thus, we asked whether the level of developed peripheral fatigue would differ when two consecutive exercise trials were completed to task failure. Ten trained sport students performed two exercise trials to task failure on an isometric dynamometer, allowing peripheral fatigue to be assessed 2 s after maximal voluntary contraction (MVC) post task failure. The trials, separated by 8 min, consisted of repeated sets of 10 × 5-s isometric knee extension followed by 5-s rest between contractions. In each set, the first nine contractions were performed at a target force at 60% of the pre-exercise MVC, while the 10th contraction was a MVC. MVC and evoked force responses to supramaximal electrical femoral nerve stimulation on relaxed muscles were assessed during the trials and at task failure. Stimulations at task failure consisted of single stimulus (SS), paired stimuli at 10 Hz (PS10), paired stimuli at 100 Hz (PS100), and 50 stimuli at 100 Hz (tetanus). Time to task failure for the first trial (12.84 ± 5.60 min) was longer (P < 0.001) than for the second (5.74 ± 1.77 min). MVC force was significantly lower at task failure for both trials compared with the pre-exercise values (both P < 0.001), but there were no differences in MVC at task failure in the first and second trials (P = 1.00). However, evoked peak force for SS, PS100, and tetanus were all reduced more at task failure in the second compared to the first trial (P = 0.014 for SS, P < 0.001 for PS100 and tetanus). These results demonstrate that subjects do not terminate exercise at task failure because they have reached a critical threshold in peripheral fatigue. The present data therefore question the existence of a critical peripheral fatigue threshold during intermittent isometric exercise to task failure with the knee extensors.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Frontiers Research Foundation
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
maximal voluntary contraction
en_US
dc.subject
femoral nerve electrical stimulation
en_US
dc.subject
neuromuscular activation
en_US
dc.subject
neuromuscular fatigue
en_US
dc.subject
evoked peak force
en_US
dc.subject
knee extension
en_US
dc.subject
electromyography
en_US
dc.subject
rating of perceived exertion
en_US
dc.title
No critical peripheral fatigue threshold during intermittent isometric time to task failure test with the knee extensors
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2016-12-19
ethz.journal.title
Frontiers in Physiology
ethz.journal.volume
7
en_US
ethz.journal.abbreviated
Front Physiol
ethz.pages.start
627
en_US
ethz.size
10 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.identifier.nebis
006386708
ethz.publication.place
Lausanne
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::02535 - Institut für Bewegungswiss. und Sport / Institut of Human Movement Sc. and Sport::08691 - Spengler, Christina (Tit.-Prof.)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::02535 - Institut für Bewegungswiss. und Sport / Institut of Human Movement Sc. and Sport::08691 - Spengler, Christina (Tit.-Prof.)
ethz.date.deposited
2017-06-12T16:23:49Z
ethz.source
ECIT
ethz.identifier.importid
imp593654e2c86c631088
ethz.ecitpid
pub:185209
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-18T10:38:44Z
ethz.rosetta.lastUpdated
2019-08-20T13:08:06Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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