Skinner H B, Wyatt M P, Hodgdon J A, Conard D W, Barrack R L
J Orthop Res. 1986;4(1):112-8. doi: 10.1002/jor.1100040115.
This study was designed to test position sense of the knee joint before and after fatigue in order to determine whether muscle or capsular receptors are the primary sensors for joint position sense. Reproduction of passive positioning and detection of the onset of motion (kinesthesia) were employed to measure joint position sense. Eleven subjects underwent joint position sense measurement before and after a fatigue protocol. A significant worsening of reproduction of knee joint angle after fatigue was noted (p less than 0.05). Threshold (kinesthesia) showed no statistically significant change after fatigue. A significant correlation of reproduction measurements and threshold measurements prior to fatigue (p less than 0.01) demonstrated that the same neural mechanism is applicable in the rested state, but these variables did not correlate significantly after fatigue. There was a significant correlation between reproduction measurements before and after fatigue (p = 0.018), while no correlation was seen for the pre- and postfatigue threshold measurements, suggesting a change in the neural path after fatigue. Since both tests of joint position sense are affected by fatigue, we conclude that muscle receptors are a prominent, if not primary, determinant of joint position sense, and capsular receptors may have a secondary role. Reproduction ability is decreased, presumably through the loss of efficiency of muscle receptors. The threshold data suggest a change in the mechanism of appreciation after fatigue, possibly due to increased sensitivity of capsular receptors from muscle-fatigue-induced laxity.
本研究旨在测试膝关节在疲劳前后的位置觉，以确定肌肉或关节囊感受器是否为关节位置觉的主要传感器。采用被动定位的再现和运动起始的检测（动觉）来测量关节位置觉。11名受试者在疲劳方案前后接受了关节位置觉测量。结果发现，疲劳后膝关节角度再现明显变差（p<0.05）。阈值（动觉）在疲劳后无统计学显著变化。疲劳前再现测量值与阈值测量值之间存在显著相关性（p<0.01），表明在静息状态下适用相同的神经机制，但疲劳后这些变量无显著相关性。疲劳前后的再现测量值之间存在显著相关性（p = 0.018），而疲劳前后的阈值测量值之间无相关性，提示疲劳后神经通路发生了变化。由于关节位置觉的两项测试均受疲劳影响，我们得出结论，肌肉感受器即使不是关节位置觉的主要决定因素，也是一个重要因素，而关节囊感受器可能起次要作用。再现能力下降，可能是由于肌肉感受器效率降低。阈值数据提示疲劳后感知机制发生了变化，可能是由于肌肉疲劳导致关节囊松弛，使关节囊感受器敏感性增加。
