Sanford Sports Science Institute, Fargo, North Dakota.
Sanford Research, Sanford Health, Sanford Orthopedics and Sports Medicine, Fargo, North Dakota.
J Strength Cond Res. 2017 Dec;31(12):3279-3286. doi: 10.1519/JSC.0000000000002218.
Bond, CW, Willaert, EM, Rudningen, KE, and Noonan, BC. Reliability of three timing systems used to time short on ice-skating sprints in ice hockey players. J Strength Cond Res 31(12): 3279-3286, 2017-Speed and acceleration are highly valued in ice hockey and frequently assessed using timing systems. Coaches must use reliable timing systems to assess these attributes, but many systems have not been thoroughly evaluated and the required number of sprint repetitions to obtain the coach's desired degree of reliability for a system may be impractical. This study aimed to compare the reliability of a single photocell (PC), a single laser with a microprocessor (LA), and a digital video camera (VC); and in doing so, evaluate the influence of completing additional sprint repetitions on each systems' reliability. We hypothesized that PC and LA would yield different times, have inferior reliability, and require a larger number of sprint repetitions to obtain the same degree of reliability compared with VC. Seventeen male ice hockey players completed 5 repetitions of a 9.15 m on ice-skating sprint timed simultaneously by PC, LA, and VC. The times obtained from VC were narrowly distributed around the mean compared with PC and LA and resulted in a mean sprint time approximately 0.05 and 0.07 second faster than PC and LA, respectively {PC: 1.74 second (95% confidence interval [1.72-1.76]); LA: 1.76 second [1.74-1.78]; VC: 1.69 second [1.67-1.70]}. When 2 sprint repetitions were completed, PC and LA typical error (TE) and smallest worthwhile difference (SWD) were 2.8- and 4.3-fold greater than VC, respectively. As more repetitions were completed, TE and SWD for PC and LA improved but remained approximately 2-fold greater than VC even when 5 repetitions were completed. With a smaller TE and SWD, VC was able to detect smaller "real" changes in a player's sprint performance over time compared with PC and LA.
邦德、CW、威拉尔特、EM、鲁丁根、KE 和努南，BC。三种计时系统在冰球运动员短道滑冰冲刺计时中的可靠性。J 力量与条件研究 31（12）：3279-3286，2017 年-速度和加速度在冰球中受到高度重视，并经常使用计时系统进行评估。教练必须使用可靠的计时系统来评估这些属性，但许多系统尚未经过彻底评估，并且为了获得系统所需的教练期望可靠性，可能需要进行不切实际的大量冲刺重复。本研究旨在比较单个光电管（PC）、带微处理器的单个激光（LA）和数字摄像机（VC）的可靠性；并在这样做的过程中，评估完成额外冲刺重复对每个系统可靠性的影响。我们假设 PC 和 LA 将产生不同的时间，可靠性较低，并且与 VC 相比，需要进行更多的冲刺重复才能获得相同的可靠性程度。17 名男性冰球运动员在冰上完成了 5 次 9.15 米的滑冰冲刺，由 PC、LA 和 VC 同时计时。与 PC 和 LA 相比，VC 获得的时间分布更加集中在平均值周围，结果使平均冲刺时间分别比 PC 和 LA 快约 0.05 和 0.07 秒{PC：1.74 秒（95%置信区间 [1.72-1.76]）；LA：1.76 秒 [1.74-1.78]；VC：1.69 秒 [1.67-1.70]}。当完成 2 次冲刺重复时，PC 和 LA 的典型误差（TE）和最小有意义差异（SWD）分别是 VC 的 2.8 倍和 4.3 倍。随着重复次数的增加，PC 和 LA 的 TE 和 SWD 有所改善，但即使完成了 5 次重复，也仍然比 VC 高出约 2 倍。由于 TE 和 SWD 较小，VC 能够检测到运动员在一段时间内的冲刺性能的较小“真实”变化，而 PC 和 LA 则无法检测到。
