Lack of cortical or Ia-afferent spinal pathway involvement in muscle force loss after passive static stretching
| Autor: | Anthony J. Blazevich, Timothy S. Pulverenti, Gabriel S. Trajano, Benjamin J. C. Kirk, Andrew Walsh |
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| Rok vydání: | 2020 |
| Předmět: |
Adult
Male Physiology medicine.medical_treatment Electromyography Ia afferent Spinal pathway Static stretching H-Reflex 03 medical and health sciences Young Adult 0302 clinical medicine medicine Humans Muscle Skeletal Muscle force Motor Neurons Afferent Pathways medicine.diagnostic_test Chemistry General Neuroscience 030229 sport sciences Evoked Potentials Motor Transcranial Magnetic Stimulation Biomechanical Phenomena Transcranial magnetic stimulation H-reflex Muscle stretching Neuroscience 030217 neurology & neurosurgery Muscle Contraction |
| Zdroj: | Journal of neurophysiology. 123(5) |
| ISSN: | 1522-1598 |
| Popis: | This study investigated whether modulation of corticospinal-motoneuronal excitability and/or synaptic transmission of the Ia afferent spinal reflex contributes to decreases in voluntary activation and muscular force after an acute bout of prolonged static muscle stretching. Fifteen men performed five 60-s constant-torque stretches (15-s rest intervals; total duration 5 min) of the plantar flexors on an isokinetic dynamometer and a nonstretching control condition in random order on 2 separate days. Maximum isometric plantar flexor torque and triceps surae muscle electromyographic activity (normalized to M wave; EMG/M) were simultaneously recorded immediately before and after each condition. Motor-evoked potentials (using transcranial magnetic stimulation) and H-reflexes were recorded from soleus during EMG-controlled submaximal contractions (23.4 ± 6.9% EMG maximum). No changes were detected in the control condition. After stretching, however, peak torque (mean ± SD; -14.3 ± 7.0%) and soleus EMG/M (-17.8 ± 6.2%) decreased, and these changes were highly correlated ( |
| Databáze: | OpenAIRE |
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