School of Mechanical and Aerospace Engineering, Queen's University Belfast, Belfast, BT9 5AH, UK.
School of Sport, Ulster University, Belfast, BT15 1AP, UK.
Sci Rep. 2023 Jul 5;13(1):10896. doi: 10.1038/s41598-023-37595-y.
A novel method aimed at evaluating the active drag profile during front-crawl swimming is proposed. Fourteen full trials were conducted with each trial using a stationary load cell set-up and a commercial resistance trainer to record the tension force in a rope, caused by an athlete swimming. Seven different stroke cycles in each experiment were identified for resampling time dependent data into position dependent data. Active drag was then calculated by subtracting resistance trainer force data away from the stationary load cell force data. Mean active drag values across the stroke cycle were calculated for comparison with existing methods, with mean active drag values calculated between 76 and 140 N depending on the trial. Comparing results with established active drag methods, such as the Velocity Perturbation Method (VPM), shows agreement in the magnitude of the mean active drag forces. Repeatability was investigated using one athlete, repeating the load cell set-up experiment, indicating results collected could range by 88 N depending on stroke cycle position. Variation in results is likely due to inconsistencies in swimmer technique and power output, although further investigation is required. The method outlined is proposed as a representation of the active drag profile over a full stroke cycle.
提出了一种新的方法，旨在评估自由泳中的主动阻力轮廓。进行了十四次完整的试验，每次试验都使用固定的称重传感器设置和商业阻力训练器来记录运动员游泳时绳索产生的张力。在每个实验中确定了七个不同的划水周期，以便将时间相关数据重新采样为位置相关数据。然后通过从固定称重传感器力数据中减去阻力训练器力数据来计算主动阻力。计算整个划水周期的平均主动阻力值，以便与现有方法进行比较，根据试验的不同，平均主动阻力值在 76 到 140N 之间。与已建立的主动阻力方法（如速度干扰法（VPM））的结果进行比较，表明平均主动阻力的大小一致。使用一名运动员重复称重传感器设置实验来研究可重复性，表明根据划水周期的位置，收集到的结果可能会有 88N 的差异。结果的差异可能是由于游泳者技术和功率输出的不一致造成的，尽管需要进一步的调查。所提出的方法旨在表示整个划水周期的主动阻力轮廓。
