Institute of Sports Sciences, University of Lausanne, Lausanne, Switzerland.
J Sports Sci. 2010 Aug;28(10):1043-6. doi: 10.1080/02640414.2010.498483.
The purpose of this study was to evaluate a new method of measuring rolling resistance in treadmill cycling and to establish its sensitivity and reproducibility. One participant was asked to keep a bicycle in equilibrium on a treadmill without pedalling at a constant speed of 5.56 m x s(-1), which was held in place in the front by a dynamometer. For each condition, the method consisted of 11 measurements of the force required to hold the cycle at different treadmill slopes (0-10%, increment 1%). The coefficient of rolling resistance was calculated based on the forces applied to the bicycle in equilibrium. To test the sensitivity of the method, the bicycle was successively equipped with three tyre types (700 x 28, 700 x 23, 700 x 22) and inflation pressure was set at 150, 300, 600, 900, and 1100 kPa. To test the reproducibility of the method, a second experimenter repeated all measurements done with the 700 x 23 tyres. The method was sensitive enough to detect an effect of both tyre type and inflation pressure (P < 0.001: two-way ANOVA). The measurement of the coefficient of rolling resistance by two separate experimenters resulted in a small bias of 0.00029 (95% CI, -0.00011 to 0.00068). In conclusion, the new method is sensitive and reliable, as well as being simple and affordable.
本研究旨在评估一种新的跑步机骑行滚动阻力测量方法，并确定其敏感性和可重复性。要求一名参与者在跑步机上以 5.56 m x s(-1)的恒定速度保持自行车平衡，自行车的前轮由测力计固定。对于每种情况，该方法包括在不同跑步机坡度（0-10%，步长 1%）下测量保持自行车平衡所需的力 11 次。滚动阻力系数是根据自行车在平衡状态下所受的力计算得出的。为了测试该方法的敏感性，自行车依次配备了三种轮胎类型（700 x 28、700 x 23、700 x 22），充气压力分别设置为 150、300、600、900 和 1100 kPa。为了测试该方法的可重复性，第二位实验者重复了使用 700 x 23 轮胎进行的所有测量。该方法对轮胎类型和充气压力的影响具有足够的敏感性（P < 0.001：双向方差分析）。由两位独立实验者测量滚动阻力系数的结果存在 0.00029 的小偏差（95%CI，-0.00011 至 0.00068）。总之，该新方法灵敏可靠，简单经济。
