27 research outputs found
Effect of cold pressor test on visual reaction time and auditory reaction time
831-833Influence of stress (cold) on visual
reaction time (VRT) for red, green and yellow colours and auditory reaction
time (ART) for high and low pitched sounds was studied in 60 healthy subjects
(I7-19 years) by digital display response time apparatus.Pain threshold and
pain tolerance time were 23.02 ± 8. 11 and 249.35 ± 64.88 sec.respectively.
During the standard cold pressor test (CPT), there was significant increase (P0.01)
in VRT for all the three colours, the increase being the least for the red
colour. There was significant increase (P0 .01) in ART
for both high and low pitched sounds. There was increase in heart rate and
respiratory rate as compared to controls. This increase in VRT and ART with CPT
was probably due to decreased conduction velocity of nerves, which could be due
to vasoconstriction attributed to increased sympathetic activity caused by cold
and pain
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Stapedius reflexometry: A diagnostic test of myasthenia gravis
Contraction of the stapedius muscle can be measured by electroacoustic impedance bridge. Muscle weakness and easy fatiguability which are cardinal features of myasthenia gravis (MG) are manifested by increased threshold and early decay of the stapedius reflex. This can be used as an objective test in the diagnosis of myasthenia gravis. Stapedius reflex was measured using Madsen Zo72 electroacoustic impedance bridge in 10 patients with myasthenia gravis and in an equal number of controls. The test was done before and 30 min after intramuscular injection of neostigmin.
All patients with myasthenia gravis showed an elevated reflex threshold and 5 patients showed reflex decay. These findings reverted to normal after neostigmin injection. Stapedius reflexometry is a simple objective test for the diagnosis of myasthenia gravis