Journal of IMAB - Annual Proceeding (Scientific Papers)
Publisher: Peytchinski, Gospodin Iliev
ISSN: 1312 773X
Issue: 2013, vol. 19, book 1;
Subject Collection: Medicine
Published online: 1 February 2013
J of IMAB. 2013; 19(1):379-381;
RELATIONSHIP BETWEEN REACTION TIME AND AMPLITUDE CHANGES OF THE H-REFLEX IN THE PERFORMANCE OF SIMPLE MOTOR TASK IN PATIENTS WITH THYROTOXICOSIS
Miroslav Marinov1, Iglika Marinova2, Kosta Mirchev3, Borislav Boychev4, Christiana Romanova2, Nina Radeva5, Radko Zl. Radev 1
1) Department of Preclinical and Clinical Sciences, 2) Department of Hygiene and disaster medicine, 3) Department of Physiology and Pathophysiology, 4) University Hospital – Varna, 5) Department of Health Management,
Medical University – Varna, Bulgaria.
The authors examine the dependence between reaction time as an indicator of change at cerebral level and H-reflex amplitude change being a relative index of excitability level in the spinal cord during the preparation of a simple voluntary movement in thyrotoxicosis patients. Electrophysiological investigations are carried out after identifying the disease and prior to the beginning of causal therapy. Patients are comfortably seated on a chair in a dark room and respond to light signal from a blitz-lamp and it was determined reaction time. Simultaneously with light signal presentation, nervus tibialis in the popliteal fossa of the same leg is excited to evoke H-reflex. One-day signal programme consists of a total of 120 light signals divided into three equal blocks. H-reflex amplitude evoked only once for every light signal is compared with control H-reflex amplitude. Its decrease or increase is read. Reaction times are grouped according to the extern of corresponding H-reflex amplitude increase or decrease. Data obtained serve to construct relation curve between reaction time and H-reflex amplitude changes. This relation curve differs in nature from the curve when healthy subjects under the same experimental conditions are tested.
Key words: reaction time, H-reflex amplitude change, thyrotoxicosis, voluntary movement.
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Please cite this article as:
Marinov M, Marinova I, Mirchev K, Boychev B, Romanova Ch, Radeva N, Radev RZ. Relationship between reaction time and amplitude changes of the H-reflex in the performance of simple motor task in patients with thyrotoxicosis. J of IMAB. 2013; 19(1):379-381. DOI: 10.5272/jimab.2013191.379.
Correspondence to: Radko Zlatkov Radev, MD, PhD. Department of preclinical and clinical medicine, Medical University of Varna, Bulgaria.
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Accepted for publication: 17 June 2012
Published online: 1 February 2013
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