Park H S, Martin B J
Center for Ergonomics, University of Michigan, Ann Arbor.
Scand J Work Environ Health. 1993 Feb;19(1):35-42. doi: 10.5271/sjweh.1506.
The aim of the investigation was to determine the influence of vibration displacement amplitude (200, 300 microns peak-to-peak), as opposed to acceleration effects at selected frequencies (40, 80, 100, 120, 150, 200 Hz), on a commonly observed but often undesired motor response elicited by local vibratory stimulation, that is, the tonic vibration reflex (TVR). Vibration was applied to the distal tendons of the hand flexor muscles. Changes in the activity of hand flexor and extensor muscles were analyzed as a function of both their initial contraction level (0, 10, 20% of maximal voluntary contraction) and the vibration parameters. The main results indicate that TVR increases with the initial muscle contraction and increases with vibration frequency up to 100-150 Hz but decreases beyond. High-frequency vibration seems to induce less muscle and tendon stress. This result is particularly important for the design of handheld vibrating tools.
本研究的目的是确定振动位移幅度（峰峰值为200、300微米）对局部振动刺激引起的一种常见但往往不希望出现的运动反应，即紧张性振动反射（TVR）的影响，与之相对的是选定频率（40、80、100、120、150、200赫兹）下的加速度效应。振动施加于手部屈肌的远端肌腱。分析手部屈肌和伸肌活动的变化，将其作为初始收缩水平（最大自主收缩的0、10、20%）和振动参数的函数。主要结果表明，TVR随肌肉初始收缩而增加，在振动频率达到100 - 150赫兹之前随频率增加，但超过该频率后则下降。高频振动似乎会导致较小的肌肉和肌腱应力。这一结果对于手持式振动工具的设计尤为重要。
