Show simple item record

dc.contributor.authorHoward, Jon C.en_US
dc.date.accessioned2010-02-16T15:45:54Z
dc.date.available2010-02-16T15:45:54Z
dc.date.issued2009-02-16T15:45:54Z
dc.identifier.urihttp://hdl.handle.net/10464/2905
dc.description.abstractWith repeated activity, force production, rate of force production, and relaxation time are impaired. These are characteristics ofa fatigued muscle (Vandenboom, 2004). However, brief bouts of near maximal to maximal activity results in the increased ability of the muscle to generate force, termed post activation potentiation (P AP)(V andervoort et aI., 1983). The purpose of the present study was to characterize motor unit firing rate (MUFR) in the unfatigued, potentiated tibialis anterior (TA). Using a quadrifilar needle electrode, MUFR was measured during a 5s 50% MVC in which the TA was either potentiated or unpotentiated; monopolar electrodes measured surface parameters. A lOs MVC was used to potentiate the muscle. Firing rate decreased significantly from 20.15±2.9Opps to 18.27±2.99pps, while mean power frequency decreased significantly from 60. 13±7.75 Hz to 53.62±8.56 Hz. No change in root mean square (RMS) was observed. Therefore, in the present study, MUFR decreases in response to a potentiated TA.en_US
dc.language.isoengen_US
dc.publisherBrock Universityen_US
dc.subjectMuscle strength.en_US
dc.subjectMuscle contraction.en_US
dc.subjectAction potentials (Electrophysiology)en_US
dc.titleDecreased motor unit firing rate in the potentiated tibialis anterior in humansen_US
dc.typeElectronic Thesis or Dissertationen_US
dc.degree.nameM.Sc. Applied Health Sciencesen_US
dc.degree.levelMastersen_US
dc.contributor.departmentApplied Health Sciences Programen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record