Muscle Spindle Responses to Concomitant Variations in Length and in Fusimotor Activation1

摘要: The capability of the different fusimotor fibres to mediate governing signals in proposed ‘follow-up length’ servo regulation muscle movements can be judged from responses spindle endings increasing rates fibre stimulation concomitant with passive shortening. Spindle ankle and intercostal muscles have been studied. Dynamic static stimulated isolation or combinations. Length inputs modulated triangular waves, mostly equal periodicity. For a action afferent impulse frequency should able increase pace drive spite length decrements. Most fibres, but none dynamic could induce an acceleration discharge over physiological range changes. This ability was not affected by co-activation either varying constant rate stimulation, when activation another added, sometimes transformed into decline. Some most which had type II effects on position sensitivity, showed little perform as defined above. Other functional implications results are also discussed.