Results 261 to 270 of about 17,387 (307)
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Adaptive plasticity in the spinal stretch reflex
Brain Research, 1983Monkeys can change the amplitude of the spinal stretch reflex without change in initial alpha motor neuron tone, as measured by EMG, or in initial muscle length. Change is apparent in 5-10 days, continues to develop over weeks, and persists during inactive periods.
J R, Wolpaw +4 more
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An Assessment of Stretch Reflex Function
1976Publisher Summary Most investigators believe that the stretch reflex is an important mechanism in the regulation of posture and movement, but the precise nature of its actions and the importance of this reflex in intact animals and humans have remained unclear.
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Stretch reflexes in human abdominal muscles
Experimental Brain Research, 2004Homonymous and heteronymous reflex connections of the abdominal muscles were investigated by the application of a tap to the muscle belly and observation of surface electromyographic responses. Reflex responses of the following abdominal muscles were investigated both ipsilateral and contralateral to the tap: rectus abdominis (RA), external oblique (EO)
Beith, I D, Harrison, P J
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Nonlinear identification of stretch reflex dynamics
Annals of Biomedical Engineering, 1988The objective of this study was to use nonlinear identification techniques to study the dynamics of stretch reflexes in the human calf muscles (gastrocnemius-soleus). Stochastic perturbations of ankle position were applied while subjects maintained a constant, tonic contraction of gastrocnemius-soleus.
R E, Kearney, I W, Hunter
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Voluntary modulation of human stretch reflexes
Experimental Brain Research, 2007It has been postulated that the central nervous system (CNS) can tune the mechanical behavior of a joint by altering reflex stiffness in a task-dependant manner. However, most of the evidence supporting this hypothesis has come from the analysis of H-reflexes or electromyogram (EMG) responses.
Daniel, Ludvig +2 more
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Diurnal rhythm in the spinal stretch reflex
Brain Research, 1982We studied primate spinal stretch reflex (SSR) amplitude as a function of time of day. SSR amplitude was greatest around midnight and smallest around noon. The diurnal rhythm was not simply a function of number of trials, or of the lighting cycle. This rhythm offers an opportunity to study the neuronal and synaptic mechanisms producing a diurnal change
J R, Wolpaw, R F, Seegal
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Spinal mechanisms of the functional stretch reflex
Experimental Brain Research, 1978A sudden and rapid angular displacement of the limb evokes, in human and monkey subjects, a segmented pattern of electromyographic activity in muscles which are stretched. While the first segment is acknowledged to represent a tendon jerk, it has been proposed that the second segment, occurring with a shorter latency than a reaction time, is mediated ...
C, Ghez, Y, Shinoda
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The human stretch reflex and the motor cortex
Trends in Neurosciences, 1991The spinal stretch reflex, exemplified by the tendon jerk, appears to be less important in humans than a delayed 'long-latency' response. This is easily observed when muscles of the hand are stretched while they are already contracting voluntarily. On limited evidence, many have long held that the delayed response is a transcortical reflex and have ...
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1998
Let us examine the lowest motor control level for which the neural structure is delimited by the major identified neurons of the spinal cord (i.e., α- and γ-motoneurons, Ia interneurons, and Renshaw cells) and by extrafusal and intrafusal muscle fibers.
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Let us examine the lowest motor control level for which the neural structure is delimited by the major identified neurons of the spinal cord (i.e., α- and γ-motoneurons, Ia interneurons, and Renshaw cells) and by extrafusal and intrafusal muscle fibers.
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Taurine Enhances Stretch Reflex Excitability
2019The purpose of this study was to characterize the effects of taurine (supplementation and acute injection) on the stretch reflex in the ankle muscles, and in particular to compare the effects of chronic taurine supplementation versus acute injection on the muscle tension, amplitude of electromyogram and velocity of muscle response.
Salvatore, Rotondo +4 more
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