Research Institute MOVE, VU University Amsterdam, Amsterdam, The Netherlands.
Int J Sports Med. 2012 Nov;33(11):880-5. doi: 10.1055/s-0032-1306285. Epub 2012 Jun 15.
There is little standardization of how to measure cycling gross efficiency (GE). Therefore, the purposes of these studies were to evaluate the effect of: i) stage duration, ii) relative exercise intensity, iii) work capacity and iv) a prior maximal incremental test on GE. Trained subjects (n=28) performed incremental tests with stage durations of 1-, 3-, and 6-min to establish the effect of stage duration and relative exercise intensity on GE. The effect of work capacity was evaluated by correlating GE with peak power output (PPO). In different subjects (n=9), GE was measured at 50% PPO with and without a prior maximal incremental test. GE was similar in 3- and 6-min stages (19.7 ± 2.8% and 19.3 ± 2.0%), but significantly higher during 1-min stages (21.1 ± 2.7%), GE increased with relative exercise intensity, up to 50% PPO or the power output corresponding to the ventilatory threshold and then remained stable. No relationship between work capacity and GE was found. Prior maximal exercise had a small effect on GE measures; GE was lower after maximal exercise. In conclusion, GE can be determined robustly so long as steady state exercise is performed and RER ≤ 1.0.
对于如何衡量自行车总效率（GE），目前几乎没有标准化的方法。因此，这些研究的目的是评估以下因素对 GE 的影响：i）阶段持续时间，ii）相对运动强度，iii）工作能力，iv）先前的最大递增测试。经过训练的受试者（n=28）进行了 1 分钟、3 分钟和 6 分钟的递增测试，以确定阶段持续时间和相对运动强度对 GE 的影响。通过将 GE 与最大功率输出（PPO）相关联，评估了工作能力的影响。在不同的受试者（n=9）中，在没有先前最大递增测试的情况下，以 50%PPO 测量 GE，并在有先前最大递增测试的情况下测量 GE。3 分钟和 6 分钟阶段的 GE 相似（19.7±2.8%和 19.3±2.0%），但 1 分钟阶段的 GE 明显更高（21.1±2.7%）。GE 随相对运动强度增加，最高可达 50%PPO 或与通气阈值相对应的功率输出，然后保持稳定。工作能力与 GE 之间没有关系。先前的最大运动对 GE 测量值的影响较小；在最大运动后，GE 较低。总之，只要进行稳态运动且呼吸商≤1.0，就可以可靠地确定 GE。
