Kumar Robert I, Forman Garrick N, Forman Davis A, Mugnosso Maddalena, Zenzeri Jacopo, Button Duane C, Holmes Michael W R
Faculty of Applied Health Sciences, Brock University, St. Catharines, ON, Canada.
Faculty of Science, University of Ontario Institute of Technology, Oshawa, ON, Canada.
Front Sports Act Living. 2020 Oct 6;2:574650. doi: 10.3389/fspor.2020.574650. eCollection 2020.
We evaluated the effects of muscle fatigue on hand-tracking performance in young adults. Differences were quantified between wrist flexion and extension fatigability, and between males and females. Participants were evaluated on their ability to trace a pattern using a 3-degrees-of-freedom robotic manipulandum before (baseline) and after (0, 1, 2, 4, 6, 8, and 10 mins) a submaximal-intensity fatigue protocol performed to exhaustion that isolated the wrist flexors or extensors on separate days. Tracking tasks were performed at all time points, while maximal voluntary contractions (MVCs) were performed at baseline, and 2, 6-, and 10-mins post-task termination. We evaluated movement smoothness (jerk ratio, JR), shape reproduction (figural error, FE), and target tracking accuracy (tracking error, TE). MVC force was significantly lower in females ( < 0.05), lower than baseline for all timepoints after task termination ( < 0.05), with no muscle group-dependent differences. JR did not return to baseline until 10-mins post-task termination (most affected), while FE returned at 4-mins post-task termination, and TE at 1-min post-task termination. Males tracked the target with significantly lower JR ( < 0.05), less TE ( < 0.05), and less FE ( < 0.05) than females. No muscle group-dependent changes in hand-tracking performance were observed. Based on this work, hand tracking accuracy is similarly impaired following repetitive submaximal dynamic wrist flexion or extension. The differences between male and female fatigability was independent of the changes in our tracking metrics.
我们评估了肌肉疲劳对年轻人手部跟踪性能的影响。对腕部屈伸疲劳性之间以及男性和女性之间的差异进行了量化。在使用三自由度机器人操作器追踪图案的能力方面，对参与者在进行次最大强度疲劳方案直至筋疲力尽之前（基线）和之后（0、1、2、4、6、8和10分钟）进行评估，该疲劳方案在不同日期分别孤立腕部屈肌或伸肌。在所有时间点都进行跟踪任务，而最大自主收缩（MVC）在基线以及任务终止后2、6和10分钟进行。我们评估了运动平滑度（急动率，JR）、形状再现（图形误差，FE）和目标跟踪准确性（跟踪误差，TE）。女性的MVC力量显著更低（<0.05），任务终止后的所有时间点均低于基线（<0.05），且不存在肌肉群依赖性差异。JR直到任务终止后10分钟才恢复到基线（受影响最大），而FE在任务终止后4分钟恢复，TE在任务终止后1分钟恢复。男性跟踪目标时的JR显著低于女性（<0.05），TE和FE也更少（<0.05）。未观察到手部跟踪性能存在肌肉群依赖性变化。基于这项工作，重复性次最大动态腕部屈伸后，手部跟踪准确性同样会受损。男性和女性疲劳性之间的差异与我们跟踪指标的变化无关。
