Increase in corticospinal excitability of limb and trunk muscles according to maintenance of neck flexion
Autor: | Katsuo Fujiwara, Hidehito Tomita, Kenji Kunita |
---|---|
Rok vydání: | 2009 |
Předmět: |
Adult
Male Movement Muscle Relaxation medicine.medical_treatment Posture Stimulus (physiology) Sitting Biceps Upper Extremity Young Adult Neck Muscles Reaction Time Saccades medicine Humans Evoked potential Muscle Skeletal Abdominal Muscles business.industry General Neuroscience Motor Cortex Anatomy Evoked Potentials Motor Transcranial Magnetic Stimulation Chin Transcranial magnetic stimulation medicine.anatomical_structure Muscle relaxation Spinal Cord Neck flexion Female business Neck |
Zdroj: | Neuroscience Letters. 461:235-239 |
ISSN: | 0304-3940 |
DOI: | 10.1016/j.neulet.2009.06.047 |
Popis: | The effect of maintenance of neck flexion on corticospinal excitability of limb and trunk muscles was investigated using transcranial magnetic stimulation (TMS). Nine healthy young subjects participated in this experiment. Every measurement was performed with subjects sitting on a chair. Target muscles were the first dorsal interosseous (FDI), biceps brachii (BB), triceps brachii (TB), rectus abdominis (RA), erector spinae (ES), rectus femoris (RF), biceps femoris (BF), tibialis anterior (TA), and gastrocnemius (GcM) on the right side. TMS was applied to the left primary motor cortex, and motor evoked potential (MEP) was measured from the muscles listed above. Optimal stimulus location and resting motor threshold (RMT) were identified for each target muscle, and stimulus intensity used was 120% of RMT. MEPs of the target muscle were recorded with the chin resting on a chin support (chin-on condition) with neck in 20 degrees of flexion, and with voluntary maintenance of the neck flexion posture (chin-off condition). Amplitude and latency of MEP and background activity of target muscles were analyzed. For FDI, BB, TB, ES, and RF, amplitude of MEP increased and latency shortened in the chin-off compared with the chin-on condition. No significant difference in background activity of each target muscle was found between the two conditions. Corticospinal excitability of limb and trunk muscles was selectively enhanced while neck flexion was maintained. |
Databáze: | OpenAIRE |
Externí odkaz: |