Results 201 to 210 of about 139,667 (256)

Postexercise potentiation of the H-reflex in humans

Medicine & Science in Sports & Exercise, 1998
Post-muscle activation effects on segmental reflexes reveal divergent results dependent upon the manner in which the muscle is activated. Electrically activating triceps surae invokes a potentiation of the Achilles' tendon reflex and the soleus (S) H-reflex termed posttetanic potentiation.
M H, Trimble, S S, Harp
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H-Reflex Operant Conditioning in Mice

Journal of Neurophysiology, 2006
Rats, monkeys, and humans can alter the size of their spinal stretch reflex and its electrically induced analog, the H-reflex (HR), when exposed to an operant conditioning paradigm. Because this conditioning induces plasticity in the spinal cord, it offers a unique opportunity to identify the neuronal sites and mechanisms that underlie a well-defined ...
Jonathan S, Carp, Ann M, Tennissen, Xiang Yang, Chen, Jonathan R, Wolpaw   +3 more
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Effects of Propofol on H-reflex in Humans

Anesthesiology, 2001
Background Depression of spinal cord motoneuron excitability has been proposed to contribute to surgical immobility. The H-reflex, which measures alpha-motoneuron excitability, is depressed by volatile anesthetics, whereas the action of propofol is unknown.
T, Kerz, H J, Hennes, A, Fève, P, Decq, P, Filipetti, P, Duvaldestin   +5 more
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Diurnal H-reflex variation in mice

Experimental Brain Research, 2005
Mice exhibit diurnal variation in complex motor behaviors, but little is known about diurnal variation in simple spinally mediated functions. This study describes diurnal variation in the H-reflex (HR), a wholly spinal and largely monosynaptic reflex.
Jonathan S, Carp, Ann M, Tennissen, Xiang Yang, Chen, Jonathan R, Wolpaw   +3 more
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Posture modulates the sensitivity of the H-reflex

Experimental Brain Research, 2018
The effect of body posture on the human soleus H-reflex via electrical stimulation of the tibial nerve at the popliteal fossa was studied. All parameters that may influence the reflex were controlled stringently. H-reflexes were elicited in three different body postures while keeping the level of background muscle activation to a minimum.
Serpil Cecen, Imran Khan Niazi, Rasmus Wiberg Nedergaard, Alice Cade, Kathryn Allen, Kelly Holt, Heidi Haavik, Kemal S. Türker   +7 more
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H Reflexes

2009
Technically, the H-reflex test is relatively simple to perform in a clinical neurophysiology laboratory. A thorough understanding of the physiologic basis, sources of error, and clinical applications and limitations enhances the usefulness of the H reflex.
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Hoffmann H-Reflex

2003
H-reflexes are commonly elicited electrophysiological responses that are produced by submaximal stimulation of large afferent fibers and subsequent activation of motoneurons in the anterior horn of the spinal cord, possibly monosynaptically. In adults, H-reflexes are consistently elicited in calf muscles and the homologous forearm flexor muscles.
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H Reflexes Recorded During Locomotion

2002
We recorded H reflexes and the biomechanics of movement during locomotion. The soleus H reflex was strongly modulated during normal walking, depressed during the swing phase and modulated with the EMG in the stance phase. The amplitude of the H reflex increased with the EMG activity and was larger during running than walking.
Dyhre-Poulsen, Poul, Simonsen, Erik Bruun   +1 more
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Circadian rhythm in rat H-reflex

Brain Research, 1994
We measured soleus H-reflex in the Sprague-Dawley rat as a function of time of day. H-reflex amplitude displayed a marked diurnal variation, even though background EMG and M-response amplitude were stable through the day. The H-reflex was largest in the late morning and smallest around midnight.
X Y, Chen, J R, Wolpaw
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Optimal stimulus duration for the H reflex

Muscle & Nerve, 1989
AbstractAuthorities advocate different stimulus durations to produce an H reflex. In order to find the optimal stimulus duration for recording H reflexes, the recruitment curves for H reflexes and M responses were studied in 10 healthy subjects. The H reflex was recorded in the upper and lower extremities, and the durations of the electrical stimulus ...
M, Panizza, J, Nilsson, M, Hallett
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