Kenny G P, Reardon F D, Marion A, Thoden J S
Coaching Association of Canada, Ottawa, Ontario, Canada.
Eur J Appl Physiol Occup Physiol. 1995;71(5):409-15. doi: 10.1007/BF00635874.
The purpose of this study was to evaluate the relationships between heart rate (fc), oxygen consumption (VO2), peak force and average force developed at the crank in response to submaximal exercise employing a racing bicycle which was attached to an ergometer (RE), ridden on a treadmill (TC) and ridden on a 400-m track (FC). Eight male trained competitive cyclists rode at three pre-determined work intensities set at a proportion of their maximal oxygen consumption (VO2max): (1) below lactate threshold [work load that produces a VO2 which is 10% less than the lactate threshold VO2 (sub-LT)], (2) lactate threshold VO2 (LT), and (3) above lactate threshold [workload that produces a VO2 which is 10% greater than lactate threshold VO2 (supra-LT)], and equated across exercise modes on the basis of fc. Voltage signals from the crank arm were recorded as FM signals for subsequent representation of peak and average force. Open circuit VO2 measurements were done in the field by Douglas bag gas collection and in the laboratory by automated gas collection and analysis. fc was recorded with a telemeter (Polar Electro Sport Tester, PE3000). Significant differences (P < 0.05) were observed: (1) in VO2 between FC and both laboratory conditions at sub-LT intensity and LT intensities, (2) in peak force between FC and TC at sub-LT intensity, (3) in average force between FC and RE at sub-LT. No significant differences were demonstrated at supra-LT intensity for VO2. Similarly no significant differences were observed in peak and average force for either LT or supra-LT intensities. These data indicate that equating work intensities on the basis of fc measured in laboratory conditions would overestimate the VO2 which would be generated in the field and conversely, that using fc measured in the laboratory to establish field work intensity would underestimate mechanical workload experienced in the field.
本研究的目的是评估心率（fc）、耗氧量（VO2）、峰值力量以及在使用连接到测力计的赛车自行车进行次最大运动时曲柄处产生的平均力量之间的关系，运动方式包括在测力计上骑行（RE）、在跑步机上骑行（TC）以及在400米跑道上骑行（FC）。八名受过训练的男性竞技自行车运动员以其最大耗氧量（VO2max）的一定比例设定的三种预定工作强度骑行：（1）低于乳酸阈值[产生的VO2比乳酸阈值VO2少10%的工作负荷（亚乳酸阈值，sub-LT）]，（2）乳酸阈值VO2（LT），以及（3）高于乳酸阈值[产生的VO2比乳酸阈值VO2大10%的工作负荷（超乳酸阈值，supra-LT）]，并根据fc在不同运动方式之间进行等量换算。曲柄臂的电压信号被记录为调频信号，用于后续峰值和平均力量的表示。开路VO2测量在现场通过道格拉斯袋气体收集进行，在实验室通过自动气体收集和分析进行。fc用遥测仪（Polar Electro Sport Tester，PE3000）记录。观察到显著差异（P < 0.05）：（1）在亚乳酸阈值强度和乳酸阈值强度下FC与两种实验室条件下的VO2之间；（2）在亚乳酸阈值强度下FC与TC之间的峰值力量；（3）在亚乳酸阈值下FC与RE之间的平均力量。在超乳酸阈值强度下VO2没有显著差异。同样，在乳酸阈值或超乳酸阈值强度下，峰值和平均力量也没有显著差异。这些数据表明，基于实验室条件下测量的fc来等同工作强度会高估在现场产生的VO2，相反，使用实验室测量的fc来确定现场工作强度会低估在现场经历的机械工作负荷。
