Soleus H-reflex to S1 nerve root stimulation

Zhu, Yu; Starr, Arnold; Haldeman, Scott; Chu, Jay K; Sugerman, Richard A

doi:10.1016/s0924-980x(97)00058-1

Cited by 29 publications

(28 citation statements)

References 9 publications

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“…This result is in line with the results of previous studies by Pease and coworkers, showing a normal value of (7 ± 0.3) msec[3], by Ghavanini and coworkers with normal value of (6.9 ± 0.4) msec [4], by Zhu and coworkers with normal value of (6.88 ± 0.33) msec [5] and by Sadeghi and coworkers with normal value of (6.78 ± 0.3) msec [6]. …”

Section: Discussionsupporting

confidence: 93%

“…Conduction time in the afferent fibers of the central loop H-reflex,(2.69 ± 0.13) msec, and in efferent fibers, (2.99 ± 0.15) msec, were similar to estimations provided by Zhu and coworkers that showed 2.6 msec and 3.2 msec for the afferent and the efferent fibers, respectively [5]. The estimated length of S1 nerve root was (174 ± 8) mm.…”

Section: Discussionsupporting

confidence: 82%

“…In this study, the mean sacral cord conduction time was estimated to be about 1.09 msec, so it was sufficient for only one synapse because at least 1m sec is required to transmit the signal across the synapse between the sensory ending and the motor cell [5]. .…”

Section: Discussionmentioning

confidence: 99%

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A new approach to estimation of the number of central synapse(s) included in the H-reflex

et al. 2005

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Background: Among the main clinical applications of the H-reflex are the evaluation of the S1 nerve root conductivity such as radiculopathy and measurement of the excitability of the spinal motoneurons in neurological conditions. An attempt has been made to reduce the pathway over which H-reflex can be obtained in a hope to localize a lesion to the S1 nerve root, so the S1 central loop has been suggested. The main goal of this study is the estimation of the H-reflex number of synapse(s) for better understanding of the physiology of this practical reflex.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 82%

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A new approach to estimation of the number of central synapse(s) included in the H-reflex

et al. 2005

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“…They may also be recorded to direct stimulation of the sciatic nerve or S1 root (Zhu et al, 1998, Zhu et al, 2013, Alfonsi et al, 2003, Jin et al, 2010), using either high-voltage electrical or magnetic stimulation. With these forms of stimulation, the effective stimulus waveform results in a current that decays rapidly, unlike the 1-ms wide “square-wave” stimulus generally recommended for H reflex studies (Hugon, 1973, Pierrot-Deseilligny and Burke, 2012).…”

Section: Technical Issuesmentioning

confidence: 99%

Clinical uses of H reflexes of upper and lower limb muscles

Burke

2016

Clinical Neurophysiology Practice

128

117

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HighlightsH reflexes can be obtained from many upper and lower limb muscles (e.g., tibialis anterior, the thenar muscles and forearm extensors) during a voluntary contraction of the test muscle.The contraction raises motoneuron excitability and decreases the Ib limitation on the reflex.H reflexes recorded at rest from muscles for which no reflex can normally be demonstrated is evidence of hyperreflexia, raising suspicion of ALS if there is denervation in that muscle.

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“…Indeed: 1) the large sensory fibers (i.e. group I fibers) responsible for generating the monosynaptic response are especially sensitive to the effects of compression (Zhu et al, 1998;Rossi et al, 1988). This implies a loss of these fibers in the advanced stages of CTS, in which the pressure within the tunnel is especially high; 2) as shown in the present paper, F- Table I -Demographic, anthropometric, nerve conduction velocity and F-wave parameters in cases and controls and differences between the two groups.…”

Section: Discussionmentioning

confidence: 99%