Effect of muscle fatigue on the sense of limb position and movement
Effect of muscle fatigue on the sense of limb position and movement
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DOI：
10.1007/s00221-005-0174-z
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发表时间：
2006-03-01
影响因子：
2
通讯作者：
Proske, U
中科院分区：
文献类型：
--
作者：
Allen, TJ;Proske, U
我们最近证明，在一项无支撑的前臂匹配任务中，蒙住眼睛的人类受试者能够达到 2-3 度的准确度。如果锻炼一只手臂产生明显的疲劳并重复匹配任务，就会导致受试者出现位置匹配错误。这里通过简单的举重练习的疲劳程度证实了这一结果。运动后最大随意力下降30%，伴随着参考臂疲劳时伸展方向1.7度的显着匹配误差，以及指示臂疲劳时屈曲方向1.9度的显着匹配误差。我们还测试了疲劳对简单运动跟踪任务的影响，其中参考前臂以 10 到 50 度 s(-1) 的速度进行伸展。研究发现疲劳不会显着降低运动跟踪的准确性。在第二个实验中，在振动一只手臂的同时测量运动跟踪。当它是参考臂时，受试者感觉运动明显比实际速度快（3.7 度 s(-1)）。当它是指示器时，它被认为较慢（4.6 度 s(-1)）。数据支持这样的观点：肌梭负责运动感，并且这种感觉不易受到疲劳的干扰。相比之下，位置感可能会因肌肉疲劳而受到干扰。据推测，通过握住手臂抵抗重力所经历的努力感能够提供有关肢体空间位置的信息，并且由于疲劳而增加的努力会产生位置误差。
We have recently shown that in an unsupported forearm-matching task blindfolded human subjects are able to achieve an accuracy of 2-3 degrees. If one arm was exercised to produce significant fatigue and the matching task was repeated, it led subjects to make position-matching errors. Here that result is confirmed using fatigue from a simple weight-lifting exercise. A 30% drop in maximum voluntary force after the exercise was accompanied by a significant matching error of 1.7 degrees in the direction of extension when the reference arm had been fatigued, and 1.9 degrees in the direction of flexion when the indicator arm had been fatigued. We also tested the effect of fatigue on a simple movement tracking task where the reference forearm was moved into extension at a range of speeds from 10 to 50 degrees s(-1). Fatigue was found not to significantly reduce the movement-tracking accuracy. In a second experiment, movement tracking was measured while one arm was vibrated. When it was the reference arm, the subject perceived the movement to be significantly faster (3.7 degrees s(-1)) than it actually was. When it was the indicator, it was perceived to be slower (4.6 degrees s(-1)). The data supports the view that muscle spindles are responsible for the sense of movement, and that this sense is not prone to the disturbance from fatigue. By contrast, the sense of position can be disturbed by muscle fatigue. It is postulated, that the sense of effort experienced by holding the arm against the force of gravity is able to provide information about the position in space of the limb and that the increased effort from fatigue produces positional errors.