We aimed to investigate the effect of external load on the joint position sense (JPS) accuracy and its relation to the target jump height. The present study also aimed to explore the relationship between force sense (FS) and maximum voluntary isometric contraction (MVIC). Participants' MVIC levels were determined during the 45-degree knee extension task. Then, participants were asked to execute a knee JPS task with external load (EL-JPS) and with no-load (EL-JPS). To assess jumping accuracy participants were instructed to jump with their 50% of maximum jump height. Results indicated that EL-JPS error values were lower than NL-JPS. EL-JPS was correlated to jumping errors. However, the relationship between NL-JPS and jumping errors was not significant. A significant correlation was found between MVIC and FS errors.

中文翻译：

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力感对主动关节位置感的影响以及主动关节位置感，力感，跳跃和肌肉力量之间的关系。

我们旨在研究外部载荷对关节位置感（JPS）精度的影响及其与目标跳跃高度的关系。本研究还旨在探讨力觉（FS）和最大自愿等距收缩（MVIC）之间的关系。在45度膝盖伸展运动中确定参与者的MVIC水平。然后，要求参与者在外部负载（EL-JPS）和空载（EL-JPS）下执行膝盖JPS任务。为了评估跳跃的准确性，要求参与者以最大跳跃高度的50％跳跃。结果表明，EL-JPS误差值低于NL-JPS。EL-JPS与跳跃错误相关。但是，NL-JPS与跳跃误差之间的关系并不明显。发现MVIC和FS错误之间存在显着相关性。