The purpose of this study was to employ inertial measurement units (IMU) with an eye-tracking device to investigate different swing strategies between two levels of batters. The participants were 20 healthy males aged 20 to 30 years old, with ten professional and ten amateur batters. Eye gaze position, head, shoulder, trunk, and pelvis angular velocity, and ground reaction forces were recorded. The results showed that professional batters rotated segments more rhythmically and efficiently than the amateur group. Firstly, the professional group spent less time in the preparation stages. Secondly, the maximum angular velocity timing of each segment of the professional group was centralized in the swing cycle. Thirdly, the amateur group had significantly earlier gaze timing of the maximum angular velocity than the professional group. Moreover, the maximum angular velocity timing of the gaze was the earliest parameter among the five segments, and significantly earlier (at least 16.32% of cycle time) than the maximum angular velocity of the head, shoulder, trunk, and pelvis within the amateur group. The visual-motor coordination strategies were different between the two groups, which could successfully be determined by wearable instruments of IMU.

中文翻译：

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利用惯性测量单元确定棒球打击姿势的顺序链

这项研究的目的是将惯性测量单元（IMU）与眼睛跟踪设备一起使用，以调查两个击球手之间的不同挥杆策略。参与者为20名年龄在20至30岁之间的健康男性，有10名专业击球手和10名业余击球手。记录视线位置，头部，肩膀，躯干和骨盆角速度以及地面反作用力。结果表明，专业击球手比业余组更有节奏地，更有效率地旋转节拍。首先，专业团队在准备阶段花费的时间更少。其次，将专业组各段的最大角速度正时集中在挥杆周期中。第三，与专业组相比，业余组的最大角速度注视时间要早得多。而且，凝视的最大角速度定时是这五个部分中最早的参数，并且比业余组中头，肩，躯干和骨盆的最大角速度显着更早（至少为周期时间的16.32％）。两组之间的视觉-运动协调策略不同，这可以通过IMU的可穿戴仪器成功确定。