Search results for "muscle twitch"

showing 2 items of 2 documents

Neural Activation During Submaximal Contractions Seems More Reflective of Neuromuscular Ageing than Maximal Voluntary Activation

2016

International audience; This study aimed at testing the hypothesis that differences in neural activation strategy during submaximal but not maximal plantarflexions exist between young and older men. Eleven young men (YM, 26 +/- 4 years) and thirteen old men (OM, 76 +/- 3 years) volunteered for the investigation. Maximal voluntary torque (MVT) was 38.2%, lower (p < 0.001) in OM than in YM, while voluntary activation was equivalent (similar to 97%). The relationship between the interpolated twitch torque and the voluntary torque (IT-VT relationship) was composite (curvilinear + exponential) for both age-groups. However, the OM showed accentuated concavity, as attested by the occurrence of the…

AgingContraction (grammar)Voluntary activationAgeing.torquein-vivoPlantar flexionActivation patternh-reflex0302 clinical medicineVoluntary contractionmotor unitaging; clinical article; female; human; male; muscle contractility; muscle twitch; nervous system; torque; Ageing; Triceps surae; Twitch interpolation; Voluntary activation; Voluntary contractionTwitch interpolationolder-adultsmuscle contractilityOriginal Researchclinical articlenervous systemmuscle twitchfemalecross-sectional areaCardiologyTriceps suraeforcemedicine.medical_specialtymechanical-propertiesCognitive Neurosciencelcsh:RC321-57103 medical and health sciencesmaleInternal medicinemedicinehumanlcsh:Neurosciences. Biological psychiatry. Neuropsychiatryskeletal-muscle fibersbusiness.industryTwitch interpolation030229 sport sciencesAgeingageAgeingTurnover[ SDV.NEU ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]interpolated twitchPhysical therapybusinessVoluntary contraction030217 neurology & neurosurgeryNeuroscienceFrontiers in Aging Neuroscience
researchProduct

Plantar flexor activation capacity and H reflex in older adults: adaptations to strength training.

2002

The purpose of this study was to investigate whether the voluntary neural drive and the excitability of the reflex arc could be modulated by training, even in old age. To this aim, the effects of a 16-wk strengthening program on plantar flexor voluntary activation (VA) and on the maximum Hoffman reflex (Hmax)-to-maximum M wave (Mmax) ratio were investigated in 14 elderly men (65–80 yr). After training, isometric maximum voluntary contraction (MVC) increased by 18% ( P &lt; 0.05) and weight-lifting ability by 24% ( P &lt; 0.001). Twitch contraction time decreased by 8% ( P &lt; 0.01), but no changes in half relaxation time and in peak twitch torque were observed. The VA, assessed by twitch …

MaleVolitionAgingPhysiologydegenerationadaptationIsometric exerciseNerve conduction velocityhuman experimentH-ReflexTriceps surae muscleTwitch interpolationadaptation; aged; aging; article; controlled study; degeneration; excitability; exercise; Hoffmann reflex; human; human experiment; male; muscle contraction; muscle isometric contraction; muscle relaxation; muscle twitch; nerve conduction; normal human; plantaris muscle; priority journal; reflex arc; strength; torque; training; voluntary movement; Aging; Exercise; Triceps surae; Twitch interpolationAged 80 and overtrainingvoluntary movementReflex arcarticlereflex arcmusculoskeletal systemAdaptation Physiologicalmuscle twitchmedicine.anatomical_structuremuscle relaxationpriority journalCardiologyTriceps suraemedicine.symptomstrengthMuscle contractionMuscle Contractionmedicine.medical_specialtyWeight Liftingplantaris muscleStrength trainingPhysical exercisePhysical medicine and rehabilitationPhysiology (medical)Internal medicineexcitabilitymedicineHumanscontrolled studyhumannormal humanMuscle SkeletalExercisenerve conductionAgedmuscle isometric contractionbusiness.industrybody regionsHoffmann reflexTorqueH-reflexbusinessJournal of applied physiology (Bethesda, Md. : 1985)
researchProduct