17th Annual ECSS-Congress, Bruges 2012

Abstract details

Abstract-ID: 1132
Session: [EP-UD01] E-poster undebated
Lecture room: On screens
Date & time: 02.07.2014 / -
Title of the paper: SPECIFIC FEATURES OF EXCITABILITY OF CENTRAL AND PERIPHERIC PARTS OF NEUROMUSCULAR SYSTEMS OF ATHLETES IN THE TRAINING CYCLE
Authors: Mikhailova, E.
Institution: Velikiye Luki State Academy of Physical Education and Sports
Department: The Chair Physiology and Sports Medicine
Country: Russia
Abstract text Introduction Investigation of the mechanisms of neuronal adaptation of central and peripheral sections of neuromuscular systems of athletes under the influence of training and competitive loads is of great importance for practical sports. Methods and subjects 8 (males) middle - distance runners (ages 18 -21) took part in the research. Motor-evoked potentials (MEP) of leg muscles by transcranial magnetic stimulation (TMS), posterior root-muscle reflexes (PRM-reflex) of these muscles by electrical stimulation of the spinal cord at T11-T12 and M-wave were registered at rest. Single stimulus (1ms long) were used for the stimulation. Thresholds and amplitudes MEP m. soleus, m. tibialis anterior, m. gastrocnemius were analysed. Results Thresholds and maximum amplitude MEP have been changed during the training cycle. The most significant changes occurred in the competitive period. Thresholds of MEP under TMS were raised before the competitions and were decreased after them, thresholds of PRM-reflex had opposite changes. The amplitude of MEP under stimulation of motor cortex and amplitude of PRM-reflex increased before the competitions and reduced after them. The amplitude of M-wave varied insignificantly. Conclusion. There are the processes of the specific neuronal adaptation, under the influence of a focused training , which were more pronounced at the supraspinal and spinal levels. The results of the study can be used in practice of sports to control the efficiency of the training, and to evaluate degree of adaptation to muscle work. References Minassian K., Persy F., Rattay F., Dimitrijevic M.R., Hofer C., Kern H. Posterior root-muscle reflexes elicited by transcutaneous stimulation of the human lumbosacral cord// Muscle Nerve.2007 Mar;35 (3): 327-36. Leukel C, Taube W, Beck S, Schubert M. Pathway-specific plasticity in the human spinal cord// Eur J Neurosci. 2012 May;35(10):1622-9.
Topic: Neuromuscular Physiology
Keyword I: neuronal adaptation
Keyword II: motor-evoked potentials
Keyword III: middle - distance runners