カフ圧による上肢虚血時の肘と手首の姿勢の知覚変化

概要

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Our previous study showed dynamic changes in the perceived posture of the hand when inputs from large-diameter sensory nerve fibres of the hand were declined and lost. The present study further exhibited that the perceived position at the elbow changed systematically even when the sensory inputs from the arm were partially blocked. Ten healthy participants showed perceived postures of their right elbows and wrists with an ischemic block of the right upper arm using the left arms and hands. When the right arm and hand were fully extended before and during the block, the final perceived joints at the wrist and elbow were flexed in all participants, and vice versa. While there was no significant difference between joints for the magnitude of the perceived changes in full extension, the magnitude of the perceived changes at the elbow reached about 60°. In full flexion, however, the magnitude at the elbow was less than that at the wrist, indicating that the peripheral nerves at the elbow was less blocked than those at the wrist at the end of the block. Because the start of these changes occurred as the sensory inputs were declining, the changes depended on fading somatosensory signals from strongly stretching muscle and skin during the anesthesia.