It has been argued that exercise-induced muscle fatigue and tendon vibration can alter unisensory proprioceptive estimates of limb position. While exercise-induced muscle fatigue may also affect central efferent processes related to limb position sense, tendon vibration specifically targets peripheral afferent signals. It is unclear, however, whether either of these perturbations (i.e., muscle fatigue or tendon vibration) can alter the multisensory weighting processes preceding goal-directed movements. The current study sought to specifically explore visual-proprioceptive weighting before or after exercise-induced antagonist muscle fatigue (Experiment 1) vs. with or without intertrial tendon vibration (Experiment 2). To assess sensory weighting, a visual-proprioceptive mismatch between the participant's actual initial starting position and the associated visual cursor position was employed. This method provides an estimate of the reliance on the proprioceptive or visual starting limb position for their aiming movements. Although there was clear evidence of muscle fatigue, there was no systematic alteration of proprioceptive weighting after exercise and no relationship between sensory weighting and the level of fatigue. On the other hand, participants' reliance on their actual (proprioceptive) limb position was systematically reduced when exposed to tendon vibration before each aiming movement. These findings provide seminal evidence that intertrial tendon vibration, but not exercise-induced fatigue, can alter the reliability of proprioceptive estimates and the relative contributions of visual and proprioceptive information for goal-directed movement.

中文翻译：

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运动引起的疲劳与间期肌腱振动对目标导向运动的视觉本体感觉加权的贡献。

有人认为运动引起的肌肉疲劳和肌腱振动可以改变肢体位置的单感觉本体感觉估计。虽然运动引起的肌肉疲劳也可能影响与肢体位置感相关的中枢传出过程，但肌腱振动专门针对外周传入信号。然而，尚不清楚这些扰动（即肌肉疲劳或肌腱振动）是否可以改变目标导向运动之前的多感官加权过程。目前的研究试图专门探讨运动引起的拮抗肌疲劳之前或之后的视觉本体感觉权重（实验 1）与有或没有间期肌腱振动（实验 2）。为了评估感觉权重，参与者之间的视觉本体感觉不匹配 s 实际初始起始位置和相关的视觉光标位置被采用。该方法提供了对其瞄准运动对本体感觉或视觉起始肢体位置的依赖的估计。尽管有明显的肌肉疲劳证据，但运动后本体感觉权重没有系统性改变，感觉权重与疲劳程度之间也没有关系。另一方面，当在每次瞄准运动之前暴露于肌腱振动时，参与者对其实际（本体感觉）肢体位置的依赖会系统地减少。这些发现提供了开创性的证据，即肌腱振动，而不是运动引起的疲劳，