Sheel A W, Lama I, Potvin P, Coutts K D, McKenzie D C
Allan McGavin Sports Medicine Centre, Vancouver, BC.
Can J Appl Physiol. 1996 Feb;21(1):16-22. doi: 10.1139/h96-002.
The purpose of this investigation was to quantify the difference in energy expenditure between traditional cycling handlebars and aero-bars during outdoor submaximal cycling. Eleven trained cyclists (age = 29.3 +/- 1.9 years, weight = 69.4 +/- 3.8 kg, VO2max = 58.1 +/- 2.0 ml.kg-1.min-1) were randomly assigned a sequence of three hand positions: brake hoods (BH), drop-bars (DB), and aero-bars (AB). Subjects cycled at 30 km.h-1 in one position for 5 minutes, then recovered until HR fell below 120 bpm. This was then repeated for the other hand positions. All cycling was completed on a standard racing bike fitted with aero-bars. Tire pressure was held constant for all trials. A portable telemetric system (Cosmed K-2) was used to measure VO2, VE and heart rate (HR) during the trials. No statistical differences were observed between AB and DB. Significant differences (p < .05) were found between BH (VE = 66.1 +/- 2.7 L.min-1; HR = 152 +/- 4 bpm; VO2 = 1.56 +/- .15 L.min-1) and AB (VE = 61.3 +/- 2.8 L.min-1; HR = 146 +/- 4 bpm; VO2 = 1.31 +/- .10 L.min-1). AB provides an energy savings over the traditional BH cycling posture.
本研究的目的是量化在户外次最大强度骑行过程中，传统自行车车把与空气动力学车把之间的能量消耗差异。11名训练有素的自行车运动员（年龄=29.3±1.9岁，体重=69.4±3.8千克，最大摄氧量=58.1±2.0毫升·千克⁻¹·分钟⁻¹）被随机分配三种手部姿势的顺序：刹车把位（BH）、下把位（DB）和空气动力学车把位（AB）。受试者以30千米/小时的速度在一个姿势下骑行5分钟，然后恢复，直到心率降至120次/分钟以下。然后对其他手部姿势重复此过程。所有骑行均在一辆装有空气动力学车把的标准赛车自行车上完成。所有试验中轮胎压力保持恒定。在试验过程中，使用便携式遥测系统（科迈德K-2）测量耗氧量（VO2）、每分通气量（VE）和心率（HR）。在AB和DB之间未观察到统计学差异。在BH（VE = 66.1±2.7升/分钟；HR = 152±4次/分钟；VO2 = 1.56±0.15升/分钟）和AB（VE = 61.3±2.8升/分钟；HR = 146±4次/分钟；VO2 = 1.31±0.10升/分钟）之间发现了显著差异（p < .05）。与传统的BH骑行姿势相比，AB能节省能量。
