基于运动学数据采集和分析，明确了速度滑冰冲刺（直道）阶段的蹬冰角。采用4台1920*1080的高清摄像机拍摄运动员速度滑冰冲刺（直道）阶段的技术动作。每一大组（4台摄像机）分别为起始点2台一组、结束点2台一组，每组摄像机的主光轴夹角约为100°，拍摄频率60幅/s。使用Fastmove 3D Motion（锐动科技，大连，中国）的人工智能人体关节点自动识别功能对录像进行解析，并使用Butterworth 4阶低通滤波方法对蹬冰角结果进行低通滤波，截止频率为10.0Hz。同时，使用Matlab R2022a对时间进行归一化处理，得到了速度滑冰冲刺（直道）阶段的蹬冰角。

Based on kinematic data collection and analysis, the stirrup angle of the speed skating sprint (straight) phase was clarified. Four 1920*1080 high-definition cameras were used to capture the technical movements of the speed skating sprint (straight) phase. Each large group (4 cameras) consisted of 2 cameras at the start point and 2 cameras at the end point, each with a main optical axis angle of about 100° and a shooting frequency of 60 frames/s. The video was analyzed using the artificial intelligence of Fastmove 3D Motion (Dalian, China) for automatic recognition of human joints, and Butterworth 4th order low-pass filtering was used to analyze the stroking angle. The results were low-pass filtered with a cut-off frequency of 10.0 Hz using the Butterworth 4th-order low-pass filtering method, and normalized in time using Matlab R2022a to obtain the skating angle during the speed skating sprint (straight) phase.