The effect of high-frequency cutaneous vibration on different inputs subserving detection of joint movement |
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Authors: | N S Weerakkody Janet L Taylor and S C Gandevia |
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Institution: | (1) Prince of Wales Medical Research Institute, The University of New South Wales, Barker Street, Randwick, Sydney, 2031, Australia |
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Abstract: | Stimuli that preferentially activate rapidly adapting cutaneous receptors impair proprioception in the fingers. These experiments
assessed potential mechanisms. The ability to detect passive movements about interphalangeal joints of the fingers was measured
when vibrotactile stimuli were applied to the moving digit or to an adjacent digit at a high frequency (300 Hz) and low amplitude
(50 μm peak-to-peak) that favours activation of Pacinian corpuscle (PC) afferents. Detection of movement was significantly
impaired when vibration was applied to either digit. However, vibration applied to an anaesthetized adjacent digit caused
no impairment. Impairment of proprioception was still observed when only skin and joint (but not muscle) afferents could contribute
to detection, but was not significant with only muscle afferents intact during anaesthesia of the moving digit. We suggest
that activation of PC afferents, either in or near the moving digit, impairs movement detection through an interaction predominantly
between the classes of cutaneous afferents. |
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Keywords: | Proprioception Movement detection Cutaneous afferents Hand |
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