median nerve 5 Adolescent 4 Adult 4 Electromyography 4 Female 4 Humans 4 Magnetic Resonance Imaging 4 Male 4 Middle Aged 4 Syringomyelia 4 adult 4 article 4 female 4 hoffmann reflex 4 human 4 male 4 syringomyelia 4 Aged 2 H-Reflex 2 Movement 2 Muscles 2 Spinal Cord 2 adolescent 2 aged 2 body posture 2 clinical article 2 controlled study 2 dystonia 2 electromyography 2 facilitation 2