Change of direction movement is common in sports and the ability to perform this complex movement efficiently is related to athlete's performance. Wearable devices have been used to evaluate aspects of change of direction movement, but so far there are no clear recommendations on specific metrics to be used.

The aims of this scoping review were to evaluate the reliability and validity of inertial measurement unit sensors to provide information on change of direction movement and to summarize the available evidence on inertial measurement units in analyzing change of direction movement in sports.

A systematic search was employed in MEDLINE (Ovid), CINAHL (EBSCO host), SPORTDiscus (EBSCO host), EMBASE and Cochrane Database of Systematic Reviews and Web of Science to identify eligible studies. A complementary grey literature search was employed to locate non-peer reviewed studies. The risk of bias of the studies evaluating validity and/or reliability was evaluated using the AXIS tool.

The initial search identified 15,165 studies. After duplicate removal and full-text screening 49 studies met the inclusion criteria, with 11 studies evaluating validity and/or reliability.

There are promising results on the validity and reliability, but the number of studies is still small and the quality of the studies is limited. Most of the studies were conducted with pre-planned movements and participants were usually adult males. Varying sensor locations limits the ability to generalize these findings. Inertial measurement units (IMU) can be used to detect change of direction (COD) movements and COD heading angles with acceptable validity, but IMU measured or derived kinetic or kinematic variables present inconsistency and over-estimation.

Studies can be improved with larger sample sizes and agreement on the metrics used and sensor placement. Future research should include more on-field studies.

方向运动的改变在体育运动中很常见，有效执行这种复杂运动的能力与运动员的表现有关。可穿戴设备已用于评估方向运动变化的各个方面，但到目前为止，尚无关于要使用的特定指标的明确建议。

范围界定审查的目的是评估惯性测量单位传感器的可靠性和有效性，以提供有关方向运动变化的信息，并总结有关惯性测量单位在分析运动方向运动变化方面的可用证据。

在MEDLINE（Ovid），CINAHL（EBSCO主持人），SPORTDiscus（EBSCO主持人），EMBASE和Cochrane系统评价数据库和Web of Science中进行了系统搜索，以鉴定合格的研究。使用互补的灰色文献搜索来定位非同行评审的研究。使用AXIS工具评估了评估有效性和/或可靠性的研究的偏倚风险。

初步搜索确定了15,165项研究。在重复删除和全文筛选之后，有49项研究符合纳入标准，其中11项研究评估了有效性和/或可靠性。

在有效性和可靠性上有令人鼓舞的结果，但是研究数量仍然很少，并且研究质量有限。大多数研究都是在预先计划好的动作下进行的，参与者通常是成年男性。传感器位置的变化限制了概括这些发现的能力。惯性测量单位（IMU）可用于以可接受的有效性检测方向（COD）运动和COD航向角的变化，但是IMU测量或推导的动力学或运动学变量存在不一致和过高估计的情况。

可以通过增加样本量以及就使用的度量标准和传感器位置达成一致来改进研究。未来的研究应包括更多的现场研究。