Cordo P, Gandevia S C, Hales J P, Burke D, Laird G
R.S. Dow Neurological Sciences Institute, Portland, OR 97209.
Electroencephalogr Clin Neurophysiol. 1993 Feb;89(1):45-53. doi: 10.1016/0168-5597(93)90084-3.
This study investigated how the mechanical characteristics of tendon vibration influence the responses of human muscle receptors. In this study, we used a tendon vibrator in which the force, displacement and frequency of vibration were precisely controlled. The tendon vibrator could produce large amplitude displacements, so it was also used to impose ramp-and-hold stretches to the tendon to help classify muscle spindle afferents. In normal human subjects, we recorded microneurographically from single muscle afferents during tendon vibration to determine how afferent responses are influenced by the force and the displacement applied to the tendon and how these influences of force and displacement change with vibration frequency. Our results indicate that the sensitivity of muscle spindle afferents to tendon vibration is enhanced by increasing force and displacement and decreased by increasing frequency. It is concluded that, in order to predict the afferent response to vibration, the mechanical characteristics of tendon vibration must be controlled. Controlling the mechanical characteristics of tendon vibration and understanding the effect of vibration on afferent discharge will be useful for furthering our understanding of the peripheral control of movement.
本研究调查了肌腱振动的力学特性如何影响人体肌肉感受器的反应。在本研究中，我们使用了一种肌腱振动器，其振动的力、位移和频率均可精确控制。该肌腱振动器能够产生大幅度位移，因此还被用于对肌腱施加斜坡-保持拉伸，以帮助对肌梭传入纤维进行分类。在正常人体受试者中，我们在肌腱振动期间通过微神经图记录单根肌肉传入纤维的活动，以确定传入反应如何受到施加于肌腱的力和位移的影响，以及力和位移的这些影响如何随振动频率而变化。我们的结果表明，肌梭传入纤维对肌腱振动的敏感性会随着力和位移的增加而增强，随着频率的增加而降低。得出的结论是，为了预测对振动的传入反应，必须控制肌腱振动的力学特性。控制肌腱振动的力学特性并了解振动对传入放电的影响，将有助于加深我们对运动外周控制的理解。
