The main aim of this study was to evaluate the validity and the reliability of a swimming sensor to assess swimming performance and spatial-temporal variables. Six international male open-water swimmers completed a protocol which consisted of two training sets: a 6×100m individual medley and a continuous 800 m set in freestyle. Swimmers were equipped with a wearable sensor, the TritonWear to collect automatically spatial-temporal variables: speed, lap time, stroke count (SC), stroke length (SL), stroke rate (SR), and stroke index (SI). Video recordings were added as a “gold-standard” and used to assess the validity and the reliability of the TritonWear sensor. The results show that the sensor provides accurate results in comparison with video recording measurements. A very high accuracy was observed for lap time with a mean absolute percentage error (MAPE) under 5% for each stroke (2.2, 3.2, 3.4, 4.1% for butterfly, backstroke, breaststroke and freestyle respectively) but high error ranges indicate a dependence on swimming technique. Stroke count accuracy was higher for symmetric strokes than for alternate strokes (MAPE: 0, 2.4, 7.1 & 4.9% for butterfly, breaststroke, backstroke & freestyle respectively). The other variables (SL, SR & SI) derived from the SC and the lap time also show good accuracy in all strokes. The wearable sensor provides an accurate real time feedback of spatial-temporal variables in six international open-water swimmers during classical training sets (at low to moderate intensities), which could be a useful tool for coaches, allowing them to monitor training load with no effort.

本研究的主要目的是评估游泳传感器的有效性和可靠性，以评估游泳表现和时空变量。六名国际男子公开水域游泳运动员完成了一套由两套训练组成的方案：一套 6×100 米个人混合泳和一套连续 800 米自由泳。游泳者配备了可穿戴传感器 TritonWear 以自动收集时空变量：速度、单圈时间、划水次数 (SC)、划水长度 (SL)、划水频率 (SR) 和划水指数 (SI)。视频记录被添加为“黄金标准”，用于评估 TritonWear 传感器的有效性和可靠性。结果表明，与视频记录测量相比，该传感器提供了准确的结果。单圈时间的准确性非常高，每次划水的平均绝对百分比误差 (MAPE) 低于 5%（蝶泳、仰泳、蛙泳和自由泳分别为 2.2、3.2、3.4、4.1%），但高误差范围表明存在依赖性关于游泳技术。对称泳姿的泳姿计数准确度高于交替泳姿（MAPE：蝶泳、蛙泳、仰泳和自由泳的 MAPE 分别为 0、2.4、7.1 和 4.9%）。从 SC 和单圈时间得出的其他变量（SL、SR 和 SI）在所有行程中也显示出良好的准确性。可穿戴传感器在经典训练集（低到中等强度）期间提供六名国际开放水域游泳运动员的时空变量的准确实时反馈，这可能是教练的有用工具，