Comparison of the temporal properties of medium latency responses induced by cortical and peripheral stimulation |
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| Institution: | 1. Faculty of Medicine, Akdeniz University, Antalya, Turkey;2. School of Medicine, Koç University, Istanbul, Turkey;3. Department of Neuroscience, Physiology & Pharmacology, University College London, London, United Kingdom;4. Neurology Department, Faculty of Medicine, Akdeniz University, Antalya, Turkey;1. Department of Comparative Biosciences, University of Wisconsin, Madison, WI 53706, United States;2. Department of Biomedical Sciences, University of Missouri, Columbia, MO 65211, United States;3. Department of Physical Therapy, McKnight Brain Institute and Center for Respiratory Research and Rehabilitation, University of Florida, Gainesville, FL 32611-0154, United States;1. Department of Biomechanics in Sports, Technical University Munich, Germany;2. Centre for Sensorimotor Performance, The University of Queensland, Australia;3. Human Movement Science, Bundeswehr University Munich, Germany;1. Discipline of Anatomy & Histology, School of Medical Sciences, Faculty of Medicine & Health, The University of Sydney, Australia;2. Department of Rehabilitation Sciences, Faculty of Medicine & Health Sciences, Ghent University, Belgium;3. Discipline of Exercise & Sports Science, Sydney School of Health Sciences, Faculty of Medicine & Health, The University of Sydney, Australia;1. Department of Physical Therapy, Faculty of Associated Medical Sciences, Chiang Mai University, Thailand;2. Department of Neurorehabilitation Engineering, Bernstein Focus Neurotechnology Gottingen, Bernstein Centre for Computational Neuroscience, Germany;3. Koc University School of Medicine, Sariyer, Istanbul, Turkey |
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| Abstract: | Sudden foot dorsiflexion lengthens soleus muscle and activates stretch-based spinal reflexes. Dorsiflexion can be triggered by activating tibialis anterior (TA) muscle through peroneal nerve stimulation or transcranial magnetic stimulation (TMS) which evokes a response in the soleus muscle referred to as Medium Latency Reflex (MLR) or motor-evoked potential-80 (Soleus MEP80), respectively. This study aimed to examine the relationship between these responses in humans. Therefore, latency characteristics and correlation of responses between soleus MEP80 and MLR were investigated. We have also calculated the latencies from the onset of tibialis activity, i.e., subtracting of TA-MEP from MEP80 and TA direct motor response from MLR. We referred to these calculations as Stretch Loop Latency Central (SLLc) for MEP80 and Stretch Loop Latency Peripheral (SLLp) for MLR. The latency of SLLc was found to be 61.4 ± 5.6 ms which was significantly shorter (P = 0.0259) than SLLp (64.0 ± 4.2 ms) and these latencies were correlated (P = 0.0045, r = 0.689). The latency of both responses was also found to be inversely related to the response amplitude (P = 0.0121, r = 0.451) probably due to the activation of large motor units. When amplitude differences were corrected, i.e. investigating the responses with similar amplitudes, SLLp, and SLLc latencies found to be similar (P = 0.1317). Due to the identical features of the soleus MEP80 and MLR, we propose that they may both have spinal origins. |
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| Keywords: | Transcranial magnetic stimulation Medium latency reflex Motor evoked potential Spinal circuits Reflexes |
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