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Download Electromyography in CNS Disorders. Central EMG by Bhagwan T. Shahani PDF

By Bhagwan T. Shahani

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1981. Muscle receptors and movement. London: Macmillan. Ε. 1981. Human microneurography and the problems of pain. ), reprint from Japanese Society of Electroencephalography & Electromyography, pp. 169-175. G. 1974. Identification of afferent C units in intact human skin nerves. Brain Res. 67:387-403. L. 1980. Specific sensations evoked by activity in single identified sensory units in man. Acta Physiol. Scand. 110:445-447. B. et al. 1979. Somatosensory, proprioceptive and sympathetic activity in human peripheral nerves.

In press). When these M A S are plotted as a function of time, stationary as well as nonstationary conditions can be displayed. 8 for steady isometric finger extension in a normal subject. 7 Schematic illustration of the tremor generating mechanisms. The hatched area represents the part of the power spectrum produced by the force variations caused by changes of the net activity of the whole motoneuron pool. The dotted area shows the power produced by the unfused parts of the twitch contractions of single motor units (Reproduced with permission from Allum, Dietz, and Freund 1978).

Even though cooling and warming give rise to similar neural responses, there are two different fibre populations contributing to the activity on the two occasions: during warming the responding elements are the sudomotor fibers conveying their messages to the sweat glands (as evidenced by accompanying galvanic skin responses); during cooling the activity shifts over to the vasoconstrictor fibers (as evidenced by accompanying Plethysmographie events). In a comfortably warm environment (when the thermoregulatory mechanisms are at relative rest), the sudomotor and vasoconstrictor systems are about equally responsive to stimuli inducing arousal or mental excitement, but as the ambient temperature changes, the relative arousal responsiveness of the two systems varies with the thermoregulatory shifts in the background tone.

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