Human Factors Research Unit, Institute of Sound and Vibration Research, Univ. of Southampton, Southampton SO17 1BJ, UK.
J Appl Physiol (1985). 2011 Dec;111(6):1606-13. doi: 10.1152/japplphysiol.00407.2011. Epub 2011 Sep 15.
Vibration of one hand reduces blood flow in the exposed hand and in the contralateral hand not exposed to vibration, but the mechanisms involved are not understood. This study investigated whether vibration-induced reductions in finger blood flow are associated with vibrotactile perception thresholds mediated by the Pacinian channel and considered sex differences in both vibration thresholds and vibration-induced changes in digital circulation. With force and vibration applied to the thenar eminence of the right hand, finger blood flow and finger skin temperature were measured in the middle fingers of both hands at 30-s intervals during seven successive 4-min periods: 1) pre-exposure with no force or vibration, 2) pre-exposure with force, 3) vibration 1, 4) rest with force, 5) vibration 2, 6) postexposure with force, and 7) recovery with no force or vibration. A 2-N force was applied during periods 2-6 and 125-Hz vibration at 0.5 and 1.5 ms(-2) root mean square (r.m.s.; unweighted) was applied during periods 3 and 5, respectively. Vibrotactile thresholds were measured at the thenar eminence of right hand using the same force, contact conditions, and vibration frequency. When the vibration magnitude was greater than individual vibration thresholds, changes in finger blood flow were correlated with thresholds (with both 0.5 and 1.5 ms(-2) r.m.s. vibration): subjects with lower thresholds showed greater reductions in finger blood flow. Women had lower vibrotactile thresholds and showed greater vibration-induced reductions in finger blood flow. It is concluded that mechanoreceptors responsible for mediating vibration perception are involved in the vascular response to vibration.
单手振动会减少暴露于振动的手和对侧未暴露于振动的手的血流，但其中涉及的机制尚不清楚。本研究旨在调查手指血流的振动诱导减少是否与由 Pacinian 通道介导的振动触觉感知阈值有关，并考虑了振动阈值和振动引起的数字循环变化中的性别差异。在右手大鱼际施加力和振动，在七个连续的 4 分钟期间，每隔 30 秒测量双手中指的手指血流和手指皮肤温度：1）无用力或振动的预暴露，2）用力的预暴露，3）振动 1，4）用力的休息，5）振动 2，6）用力的后暴露，和 7）无用力或振动的恢复。在期间 2-6 和 12 期间施加 2-N 的力，并且在期间 3 和 5 分别施加 125-Hz 振动，振动幅度为 0.5 和 1.5 ms(-2) 均方根（未加权）。在右手大鱼际使用相同的力、接触条件和振动频率测量振动触觉阈值。当振动幅度大于个体振动阈值时，手指血流的变化与阈值相关（具有 0.5 和 1.5 ms(-2) r.m.s. 振动）：阈值较低的受试者显示出更大的手指血流减少。女性的振动触觉阈值较低，并且显示出更大的振动引起的手指血流减少。结论是，负责介导振动感知的机械感受器参与了对振动的血管反应。
