Londeree B R, Moffitt-Gerstenberger J, Padfield J A, Lottmann D
Department of Health and Exercise Sciences, University of Missouri, Columbia, USA.
Med Sci Sports Exerc. 1997 Jun;29(6):775-80. doi: 10.1097/00005768-199706000-00007.
The purpose of the study was to develop an equation to predict the oxygen cost of cycle ergometry. Forty subjects performed an incremental cycle ergometer test on three occasions at 50, 70, or 90 rpm in a counterbalanced order. Work rate was incremented every 5 or 6 min when steady rate values were achieved. To ensure accurate work rates, ergometer resistance was calibrated and flywheel revolutions were electronically measured. Oxygen consumption was measured with a computer interfaced system which provided results every minute. Oxygen consumption (mL.min-1) was the dependent variable, and independent variables were work rate (WR in kgm.min-1), pedal rate (rpm), weight (Kg), and gender (males, 0; females, 1). The following nonlinear equation was selected; VO2 = 0.42.WR1.2 + 0.00061.rpm3 + 6.35.Wt + 0.1136.RPM50.WR-0.10144.RPM90-WR-52-Gender, R2 = 0.9961, Sy.x = 106 mL.min-1, where RPM50: 50 rpm = 1, and RPM90: 90 rpm = 1, else = 0. It was concluded that the oxygen cost of cycle ergometry is nonlinearly related to work rate and pedal rate, linearly related to weight, and that females use less oxygen for a particular work rate.
本研究的目的是建立一个预测蹬车测力法耗氧量的方程。40名受试者以平衡顺序在50、70或90转/分钟的转速下进行了三次递增式蹬车测力试验。当达到稳定速率值时，工作速率每5或6分钟增加一次。为确保工作速率准确，对测力计阻力进行了校准，并对飞轮转速进行了电子测量。使用计算机接口系统测量耗氧量，该系统每分钟提供一次结果。耗氧量（毫升·分钟-1）为因变量，自变量为工作速率（WR，单位为千克米·分钟-1）、蹬踏速率（转/分钟）、体重（千克）和性别（男性为0；女性为1）。选择了以下非线性方程：VO2 = 0.42.WR1.2 + 0.00061.rpm3 + 6.35.Wt + 0.1136.RPM50.WR - 0.10144.RPM90 - WR - 52 - Gender，R2 = 0.9961，Sy.x = 106毫升·分钟-1，其中RPM50：50转/分钟 = 1，RPM90：90转/分钟 = 1，其他 = 0。得出的结论是，蹬车测力法的耗氧量与工作速率和蹬踏速率呈非线性相关，与体重呈线性相关，并且在特定工作速率下女性耗氧量较少。
