Galy O, Hue O, Boussana A, Le Gallais D, Prefaut C
UPRES EA 701. Laboratoire de Physiologie des Interactions, Service Central de Physiologie Clinique, Unité d' Exploration Respiratoire, Centre Hospitalier Universitaire Arnaud de Villeneuve, Montpellier Cedex 5, France.
Int J Sports Med. 2002 Apr;23(3):162-7. doi: 10.1055/s-2002-23170.
The aim of this study was to determine the effects of a prior run on the cardiorespiratory responses measured during a subsequent cycle segment. Twelve duathletes underwent three successive laboratory trials at an interval of one week: 1) an incremental cycle test, 2) 20 min of running followed by 20 min of cycling (RC), and 3) 20 min of control cycling (C) at the same intensity as the cycling segment of RC. Ventilatory data were collected every minute using a breath-by-breath automated system. Blood samples were collected to measure venous blood lactate concentration, [La], at rest, after the running and cycling segments of RC and after C. The results showed that the C segment of RC had significantly higher VE, VE/VO2, f and HR than C alone and significantly lower VT (p < 0.05) than C alone. Moreover, steady state during C of RC was reached at the 2nd min for VO2, VE, VCO2, VE/VO2, VE/VCO2, and VdT; at the 4th min for R and HR, and at the 5th min for f. The C of RC induced a significant increase in [La] in comparison with C alone. We concluded that the first minute of cycling after running during an RC trial induced specific metabolic and cardiorespiratory responses.
本研究的目的是确定先前的跑步对随后骑行阶段所测心肺反应的影响。12名两项全能运动员每隔一周进行三次连续的实验室测试：1）递增式骑行测试，2）20分钟跑步后接着20分钟骑行（RC），以及3）与RC的骑行阶段强度相同的20分钟对照骑行（C）。使用逐次呼吸自动系统每分钟收集通气数据。采集血样以测量静息时、RC的跑步和骑行阶段后以及C后静脉血乳酸浓度[La]。结果显示，RC的C阶段的VE、VE/VO2、f和HR显著高于单独的C，且VT显著低于单独的C（p < 0.05）。此外，RC的C阶段中，VO2、VE、VCO2、VE/VO2、VE/VCO2和VdT在第2分钟达到稳态；R和HR在第4分钟达到稳态，f在第5分钟达到稳态。与单独的C相比，RC的C阶段导致[La]显著增加。我们得出结论，在RC测试中跑步后的第一分钟骑行会引发特定的代谢和心肺反应。
