Sidossis L S, Horowitz J F, Coyle E F
Department of Kinesiology and Health, University of Texas, Austin 78712.
Int J Sports Med. 1992 Jul;13(5):407-11. doi: 10.1055/s-2007-1021289.
The effects of three different cadences and five different work rates on Gross (GE) and Delta Efficiency (DE) during cycle ergometry were studied. Fifteen well-trained cyclists exercised for 30 minutes at 60, 80, or 100 RPM on three different occasions. On each occasion, the load was increased every five minutes and corresponded to approximately 50, 60, 70, 80 and 90% of VO2max. During the last three minutes of each stage, steady-state energy expenditure was calculated while work rate was recorded. In addition, the oxygen cost of unloaded cycling (CUC) was also measured. GE was calculated as the ratio of work rate to the rate of energy expenditure, whereas DE was calculated as the reciprocal of the slope of this relationship at work rates between 50 and 90% of VO2max. The CUC corresponded to 0.66 +/- 0.03 l/min, 0.77 +/- 0.04 l/min and 1.04 +/- 0.04 l/min at 60 RPM, 80 RPM and 100 RPM, respectively (p less than 0.01 for all comparisons). GE was similar at all cadences when cycling at 80 and 90% VO2max. DE increased with increasing rpm and corresponded to 20.6 +/- 0.4%, 21.8 +/- 0.6%, and 23.8 +/- 0.4% at 60 RPM, 80 RPM and 100 RPM, respectively (p less than 0.01 for all comparisons). Therefore, when trained cyclists exercise intensely (80-90% VO2max), GE is similar at cadences of 60, 80 and 100 RPM, despite the significant increase in the CUC. Thus, it is possible that delta efficiency increases with increasing cadence.
研究了三种不同踏频和五种不同工作负荷对自行车测力计运动期间总效率（GE）和增量效率（DE）的影响。15名训练有素的自行车运动员在三种不同情况下，分别以60、80或100转/分钟的速度进行30分钟的运动。每次运动时，负荷每五分钟增加一次，分别相当于最大摄氧量（VO2max）的约50%、60%、70%、80%和90%。在每个阶段的最后三分钟内，计算稳态能量消耗，同时记录工作负荷。此外，还测量了无负荷骑行的氧耗（CUC）。GE计算为工作负荷与能量消耗率的比值，而DE计算为工作负荷在VO2max的50%至90%之间时该关系斜率的倒数。CUC在60转/分钟、80转/分钟和100转/分钟时分别对应于0.66±0.03升/分钟、0.77±0.04升/分钟和1.04±0.04升/分钟（所有比较p均小于0.01）。当以VO2max的80%和90%进行骑行时，所有踏频下的GE相似。DE随着踏频增加而增加，在60转/分钟、80转/分钟和100转/分钟时分别对应于20.6±0.4%、21.8±0.6%和23.8±0.4%（所有比较p均小于0.01）。因此，当训练有素的自行车运动员进行高强度运动（VO2max的80%-90%）时，尽管CUC显著增加，但在60、80和100转/分钟的踏频下GE相似。因此，增量效率有可能随着踏频增加而提高。
