Effects of motor nerve anesthesia and tenotomy on muscle membrane properties

1979 ◽  
Vol 379 (1) ◽  
pp. 89-93 ◽  
Author(s):  
Hrvoje Lorković
Keyword(s):  
Motor Nerve ◽  
Membrane Properties ◽  
Muscle Membrane

scholarly journals Muscle Velocity Recovery Cycles to Examine Muscle Membrane Properties

10.3791/60788 ◽  
2020 ◽  
Author(s):  
Agnes Witt ◽  
Hugh Bostock ◽  
Werner J. Z'Graggen ◽  
S. Veronica Tan ◽  
Alexander Gramm Kristensen ◽  
...  
Keyword(s):  
Membrane Properties ◽  
Muscle Membrane ◽  
Recovery Cycles

scholarly journals In vivo assessment of muscle membrane properties in myotonic dystrophy

2016 ◽  
Vol 54 (2) ◽  
pp. 249-257 ◽  
Author(s):  
S. Veronica Tan ◽  
Werner J. Z'graggen ◽  
Delphine Boërio ◽  
Christopher Turner ◽  
Michael G. Hanna ◽  
...  
Keyword(s):  
Myotonic Dystrophy ◽  
Membrane Properties ◽  
Muscle Membrane ◽  
In Vivo Assessment

Use of dexamethasone with TTX block of nerve conduction shows that muscle membrane properties are fully controlled by evoked activity

1997 ◽  
Vol 770 (1-2) ◽  
pp. 242-247 ◽  
Author(s):  
Efrem Pasino ◽  
Mario Buffelli ◽  
Giuseppe Busetto ◽  
Alberto Cangiano
Keyword(s):  
Nerve Conduction ◽  
Membrane Properties ◽  
Muscle Membrane ◽  
Evoked Activity

scholarly journals Early changes of muscle membrane properties in porcine faecal peritonitis

Critical Care ◽  
2014 ◽  
Vol 18 (4) ◽  
Author(s):  
Karin A Ackermann ◽  
Hugh Bostock ◽  
Lukas Brander ◽  
Ralph Schröder ◽  
Siamak Djafarzadeh ◽  
...  
Keyword(s):  
Membrane Properties ◽  
Muscle Membrane ◽  
Faecal Peritonitis

scholarly journals Leg pain in neuropathic postural tachycardia syndrome is associated with altered muscle membrane properties

2021 ◽  
Author(s):  
Belén Rodriguez ◽  
Karin Jost ◽  
Lotte Hardbo Larsen ◽  
Hatice Tankisi ◽  
Werner J. Z’Graggen
Keyword(s):  
Supine Position ◽  
Healthy Subjects ◽  
Body Position ◽  
Lower Leg ◽  
Membrane Properties ◽  
Leg Pain ◽  
Muscle Membrane ◽  
Postural Tachycardia Syndrome ◽  
Postural Tachycardia ◽  
Muscle Excitability

Abstract Purpose In neuropathic postural tachycardia syndrome, peripheral sympathetic dysfunction leads to excessive venous blood pooling during orthostasis. Up to 84% of patients report leg pain and weakness in the upright position. To explore possible pathophysiological processes underlying these symptoms, the present study examined muscle excitability depending on body position in patients with neuropathic postural tachycardia syndrome and healthy subjects. Methods In ten patients with neuropathic postural tachycardia syndrome and ten healthy subjects, muscle excitability measurements were performed repeatedly: in the supine position, during 10 min of head-up tilt and during 6 min thereafter. Additionally, lower leg circumference was measured and subjective leg pain levels were assessed. Results In patients with neuropathic postural tachycardia syndrome, muscle excitability was increased in the supine position, decreased progressively during tilt, continued to decrease after being returned to the supine position, and did not completely recover to baseline values after 6 min of supine rest. The reduction in muscle excitability during tilt was paralleled by an increase in lower leg circumference as well as leg pain levels. No such changes were observed in healthy subjects. Conclusions This study provides evidence for the occurrence of orthostatic changes in muscle excitability in patients with neuropathic postural tachycardia syndrome and that these may be associated with inadequate perfusion of the lower extremities. Insufficient perfusion as a consequence of blood stasis may cause misery perfusion of the muscles, which could explain the occurrence of orthostatic leg pain in neuropathic postural tachycardia syndrome.

Properties of Action Potentials from Insect Motor Nerve Fibres

1970 ◽  
Vol 53 (2) ◽  
pp. 299-316 ◽  
Author(s):  
K. G. PEARSON ◽  
R. B. STEIN ◽  
S. K. MALHOTRA
Keyword(s):  
Action Potential ◽  
Action Potentials ◽  
Motor Nerve ◽  
Fibre Diameter ◽  
Extracellular Recording ◽  
Membrane Properties ◽  
Nerve Fibres ◽  
Functional Differences ◽  
Root Relation ◽  
Motor Nerves

1. The properties of nerve action potentials in small insect motor nerves were studied using extracellular recording electrodes. 2. A length of nerve was lifted out of solution and recordings were made with respect to the solution either from an intact nerve (triphasic recording) or from near a cut end of the nerve (monophasic recording). 3. In a cockroach nerve, the number of spontaneously active fibres was small enough that corresponding nerve fibres could be identified in each preparation by their action potential amplitude and their pattern of activity. Under controlled conditions, the absolute amplitudes of either monophasic or triphasic records were reproducible and could be used to calculate fibre diameter. The calculations were confirmed from histological sections of the nerve. 4. Conduction velocity varied approximately as the 0.78 power of fibre diameter in a cockroach nerve and as 0.7 power of fibre diameter in a locust nerve. These values are considerably larger than the square root relation predicted if membrane properties are independent of fibre diameter. 5. Membrane properties probably vary with fibre diameter since the action potential duration increases dramatically for fibres below 5 µ in diameter. 6. For the cockroach nerve systematic structural differences between fibres of different sizes are also seen with the electron microscope and the relation of these to the functional differences is considered.

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