Mora-Rodriguez Ricardo, Aguado-Jimenez Roberto
Universidad de Castilla-La Mancha, Exercise Physiology Laboratory at Toledo, Spain.
Med Sci Sports Exerc. 2006 May;38(5):953-7. doi: 10.1249/01.mss.0000218139.46166.ec.
This study was conducted to determine the effect of high pedaling cadences on maximal cycling power output (W(max)).
Nine well-trained cyclists performed a continuous, incremental cycle-ergometer test to exhaustion (25 W increases every 3 min) either at 80, 100, or 120 rpm on three different occasions.
W(max) was approximately 9% lower during 120 rpm in comparison with 80 and 100 rpm (335 +/- 9, 363 +/- 7, and 370 +/- 12 W, respectively; P < 0.05). During 120 rpm, ventilation rate (V(E)) increased above the increases in expired CO(2), which reduced the power output (PO) at the ventilatory anaerobic threshold (VT(2)) by 11% (P < 0.05). Gross efficiency (GE) did not differ among trials. At 120 rpm, capillary blood lactate concentration ([Lac]) increased above the 80-rpm trial (5.3 +/- 1.2 vs 3.0 +/- 0.7 mM at 300 W; P < 0.05), although pH was not reduced. At 120 rpm, expired CO(2) increased and reduced blood bicarbonate concentration ([HCO(3)(-)]) was reduced, maintaining blood pH similar to the other trials.
A high pedaling cadence (i.e., 120 rpm) reduces performance (i.e., W(max)) and anaerobic threshold during an incremental test in well-trained cyclists. The data suggest that ventilatory anaerobic threshold (VT(2)) is a sensitive predictor of optimal pedaling cadence for performance, whereas blood pH or efficiency is not.
本研究旨在确定高踏频对最大骑行功率输出（W(max)）的影响。
九名训练有素的自行车运动员在三种不同情况下，分别以80、100或120转/分钟的踏频进行连续递增的自行车测力计测试，直至力竭（每3分钟增加25瓦）。
与80和100转/分钟相比，120转/分钟时W(max)大约低9%（分别为335±9瓦、363±7瓦和370±12瓦；P<0.05）。在120转/分钟时，通气率（V(E)）的增加超过了呼出二氧化碳的增加，这使得通气无氧阈（VT(2)）时的功率输出（PO）降低了11%（P<0.05）。各试验间的总效率（GE）无差异。在120转/分钟时，毛细血管血乳酸浓度（[Lac]）高于80转/分钟的试验（300瓦时为5.3±1.2毫摩尔/升，而80转/分钟时为3.0±0.7毫摩尔/升；P<0.05），尽管pH值未降低。在120转/分钟时，呼出二氧化碳增加，血液碳酸氢盐浓度（[HCO(3)(-)]）降低，使血液pH值保持与其他试验相似。
在训练有素的自行车运动员进行递增测试时，高踏频（即120转/分钟）会降低运动表现（即W(max)）和无氧阈。数据表明，通气无氧阈（VT(2)）是运动表现最佳踏频的敏感预测指标，而血液pH值或效率则不是。
