TAILIEUCHUNG - Báo cáo khoa hoc:" Vibration-induced extra torque during electrically-evoked contractions of the human calf muscles"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Vibration-induced extra torque during electrically-evoked contractions of the human calf muscles | Magalhães and Kohn Journal of NeuroEngineering and Rehabilitation 2010 7 26 http content 7 1 26 J NER JOURNAL OF NEUROENGINEERING AND REHABILITATION RESEARCH Open Access Vibration-induced extra torque during electrically-evoked contractions of the human calf muscles Fernando H Magalhães and André F Kohn Abstract Background High-frequency trains of electrical stimulation applied over the lower limb muscles can generate forces higher than would be expected from a peripheral mechanism . by direct activation of motor axons . This phenomenon is presumably originated within the central nervous system by synaptic input from Ia afferents to motoneurons and is consistent with the development of plateau potentials. The first objective of this work was to investigate if vibration sinusoidal or random applied to the Achilles tendon is also able to generate large magnitude extra torques in the triceps surae muscle group. The second objective was to verify if the extra torques that were found were accompanied by increases in motoneuron excitability. Methods Subjects n 6 were seated on a chair and the right foot was strapped to a pedal attached to a torque meter. The isometric ankle torque was measured in response to different patterns of coupled electrical 20-Hz rectangular 1-ms pulses and mechanical stimuli either 100-Hz sinusoid or gaussian white noise applied to the triceps surae muscle group. In an additional investigation Mmax and F-waves were elicited at different times before or after the vibratory stimulation. Results The vibratory bursts could generate substantial self-sustained extra torques either with or without the background 20-Hz electrical stimulation applied simultaneously with the vibration. The extra torque generation was accompanied by increased motoneuron excitability since an increase in the peak-to-peak amplitude of soleus F waves was observed. The delivery of electrical stimulation following the vibration was essential to keep .

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