Caputo F, Mello M T, Denadai B S
Human Performance Laboratory, UNESP, Rio Claro, Brazil.
Arch Physiol Biochem. 2003 Dec;111(5):461-6. doi: 10.3109/13813450312331342337.
The objective of the present study was to compare pulmonary gas exchange kinetics (VO2 kinetics) and time to exhaustion (Tlim) between trained and untrained individuals during severe exercise performed on a cycle ergometer and treadmill. Eleven untrained males in running (UR) and cycling (UC), nine endurance cyclists (EC), and seven endurance runners (ER) were submitted to the following tests on separate days: (i) incremental test for determination of maximal oxygen uptake (VO2max) and the intensity associated with the achievement of VO2max (IVO2max) on a mechanical braked cycle ergometer (EC and UC) and on a treadmill (ER and UR); (ii) all-out exercise bout performed at IVO2max to determine the time to exhaustion at IVO2max (Tlim) and the time constant of oxygen uptake kinetics (tau). The tau was significantly faster in trained group, both in cycling (EC = 28.2 +/- 4.7s; UC = 63.8 +/- 25.0s) and in running (ER = 28.5 +/- 8.5s; UR = 59.3 +/- 12.0s). Tlim of untrained was significantly lower in cycling (EC = 384.4 +/- 66.6s vs. UC; 311.1 +/- 105.7 s) and higher in running (ER = 309.2 +/- 176.6 s vs. UR = 439.8 +/- 104.2 s). We conclude that the VO2 kinetic response at the onset of severe exercise, carried out at the same relative intensity is sensitive to endurance training, irrespective of the exercise type. The endurance training seems to differently influence Tlim during exercise at IVO2max in running and cycling.
本研究的目的是比较在自行车测力计和跑步机上进行剧烈运动时，受过训练和未受过训练的个体之间的肺气体交换动力学（VO₂动力学）和力竭时间（Tlim）。11名未受过训练的跑步（UR）和骑自行车（UC）男性、9名耐力自行车运动员（EC）和7名耐力跑步运动员（ER）在不同日期接受了以下测试：（i）在机械制动的自行车测力计（EC和UC）和跑步机（ER和UR）上进行递增测试，以确定最大摄氧量（VO₂max）和与达到VO₂max相关的强度（IVO₂max）；（ii）在IVO₂max进行全力运动，以确定IVO₂max时的力竭时间（Tlim）和摄氧量动力学的时间常数（tau）。在训练组中，无论是在骑自行车（EC = 28.2 +/- 4.7秒；UC = 63.8 +/- 25.0秒）还是跑步（ER = 28.5 +/- 8.5秒；UR = 59.3 +/- 12.0秒）时，tau都明显更快。未受过训练者的Tlim在骑自行车时明显更低（EC = 384.4 +/- 66.6秒对UC；311.1 +/- 105.7秒），而在跑步时更高（ER = 309.2 +/- 176.6秒对UR = 439.8 +/- 104.2秒）。我们得出结论，在相同相对强度下开始的剧烈运动中，VO₂动力学反应对耐力训练敏感，无论运动类型如何。耐力训练似乎对IVO₂max时跑步和骑自行车运动中的Tlim有不同影响。
