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RESEARCH PRODUCT
Effects of electrical stimulation pattern on quadriceps isometric force and fatigue in individuals with spinal cord injury
Jeremy DenuzillerGaëlle DeleyGaëlle DeleyNicolas BabaultJohn Andrew Taylorsubject
contractionsmedicine.medical_specialtyhuman skeletal-muscleStimulationIsometric exercisefunctional electrical stimulationPhysical medicine and rehabilitationMuscle nervemedicinecatch-like propertyOrthopedics and Sports MedicinemovementsShort durationSpinal cord injuryconstant frequency trainsmechanismsexercisebusiness.industrysummationRehabilitationmedicine.diseaseFESfrequency[ SDV.NEU ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]Constant frequencymuscle fatigueelectromyostimulationbusinessstrengthvariable frequency trainsdescription
Introduction Variable frequency trains (VFT) or train combinations have been suggested as useful strategies to offset the rapid fatigue induced by constant frequency trains (CFT) during electrical stimulation. However, most studies have been of short duration with limited functional application in those with spinal cord injury (SCI). We therefore tested force and fatigue in response to VFT, CFT, and combined patterns in strength training-like conditions (6-s contractions). Methods Ten SCI individuals underwent either CFT or VFT patterns until target torque was no longer produced and then switched immediately to the other pattern. Results Target torque was reached more times when VFT was used first (VFT: 6.7 ± 0.8 vs. CFT: 3.5 ± 0.2 contractions, P < 0.05) and when it was followed by the CFT pattern (VFT-CFT: 10.3 ± 1.2 vs. CFT-VFT: 6.9 ± 1.2 contractions, P < 0.05). Conclusions These findings suggest that for the same initial forces the VFT pattern is less fatiguing than CFT and that when combining train types, VFT should be used first. Muscle Nerve 52: 260–264, 2015
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-08-01 |