Pearson Simon, Hume Patria, Slyfield David, Cronin John
Institute of Sport and Recreation Research, Auckland University of Technology, Auckland, New Zealand.
Sports Biomech. 2007 Jan;6(1):71-80. doi: 10.1080/14763140601058565.
The reliability of grinding performance was assessed in 18 current Emirates Team New Zealand America's Cup sailors in two test sessions separated by 5 h using a custom-built ergometer. Sixteen different grinding conditions that varied by load (Light 39 N x m, Moderate 48 N x m, Heavy 68 N x m), deck heel (Flat 0 degrees control, Downhill 25 degrees, Uphill 25 degrees, Right 25 degrees, Left 25 degrees), and grinding direction (forwards, backwards) were assessed using peak power and external work over 5 s during maximal-effort 8-s grinds. Reliability statistics included the difference in mean (M(diff)), standard error of measurement (SEM), and intraclass correlation coefficients (ICC). External work (SEM = 1.6-6.9%; ICC = 0.91-0.99) was a more consistent performance measure than peak power (SEM = 1.3-9.6%; ICC = 0.84-0.99) across all test conditions. Testing under different load conditions resulted in external work SEMs of 1.6-3.9% with performance more reliable in lighter load conditions. Grinding performance during different heel conditions was less reliable (external work SEMs = 4.6-6.9%). Grinding direction (forward or backward) did not appear to affect performance reliability, although external work was 10-15% higher in forward grinding. Reliability is acceptable across various loads, but testing under different heel conditions may need some protocol development to allow the detection of smaller differences in performance.
使用定制的测力计，在两个相隔5小时的测试环节中，对18名新西兰酋长队美洲杯帆船赛现役船员的磨盘操作性能可靠性进行了评估。通过最大努力8秒磨盘操作过程中5秒内的峰值功率和外部功，评估了16种不同的磨盘操作条件，这些条件在负荷（轻39牛·米、中48牛·米、重68牛·米）、甲板倾斜度（平0度对照、下坡25度、上坡25度、右倾25度、左倾25度）和磨盘操作方向（向前、向后）方面有所不同。可靠性统计数据包括均值差异（M(diff)）、测量标准误差（SEM）和组内相关系数（ICC）。在所有测试条件下，外部功（SEM = 1.6 - 6.9%；ICC = 0.91 - 0.99）比峰值功率（SEM = 1.3 - 9.6%；ICC = 0.84 - 0.99）是更一致的性能指标。在不同负荷条件下进行测试，外部功的SEM为1.6 - 3.9%，较轻负荷条件下性能更可靠。不同倾斜条件下的磨盘操作性能可靠性较低（外部功SEM = 4.6 - 6.9%）。磨盘操作方向（向前或向后）似乎不影响性能可靠性，尽管向前磨盘时外部功高10 - 百分之15。在各种负荷下可靠性是可接受的，但在不同倾斜条件下进行测试可能需要制定一些方案，以便能够检测出性能上较小的差异。
