This study aimed to investigate individual trial-to-trial performance in three tests to define adaptive regulation as a key feature of expertise in nine-ball. Thirty-one male players were assigned into the low-skilled (n = 11), intermediate (n = 10), or high-skilled groups (n = 10). The power control, cue alignment, and angle tests were selected to assess participants’ ability to control the power applied in shots, strike the ball straight, and understand the ball paths, respectively. Error distance and correction of error distance were identified for each shot using 2D video analysis. Results of one-way analysis of variance showed that the high-skilled group performed better in two out of the three tests than the other two groups (p = .010 for the cue alignment test; p = .002 for the angle test). However, the adaptation effect represented by the decreased error distances across trials was not observed. Pearson correlation revealed only a few significant correlations between the error distance and its correction within each participant in all tests (p < .05), and hence, the hypothesis that “low correction happened after small error and vice versa” is not supported.

本研究旨在调查个人在三项测试中的试验表现，以将自适应调节定义为九球专业知识的关键特征。31 名男性球员被分配到低技能组 ( n  = 11)、中级技能组 ( n  = 10) 或高技能组 ( n  = 10)。选择力量控制、球杆对齐和角度测试来分别评估参与者控制击球力量、直击球和理解球路的能力。使用 2D 视频分析为每个镜头识别误差距离和误差距离的校正。单向方差分析的结果表明，高技能组在三项测试中的两项中表现优于其他两组（p = .010 用于提示对齐测试；p  = .002 对于角度测试）。然而，没有观察到以试验间误差距离减少为代表的适应效果。皮尔逊相关性显示，在所有测试中，每个参与者的误差距离与其校正之间只有少数显着相关性 ( p  < .05)，因此，不支持“小误差后发生低校正，反之亦然”的假设。