Hill David W, Halcomb Jennifer N, Stevens Emily C
Department of Kinesiology, Health Promotion, and Recreation, University of North Texas, PO Box 311337, Denton, TX 76203-1337, USA.
Eur J Appl Physiol. 2003 Aug;89(6):612-8. doi: 10.1007/s00421-002-0779-x. Epub 2003 May 21.
The purpose of this study was to investigate the effect of exercise mode on the characteristics of the oxygen uptake (VO(2)) ()response to exercise within the severe intensity domain. Twelve participants each performed a treadmill running test and a cycle ergometer test to fatigue at intensities selected to elicit a mode-specific VO(2)max and to cause fatigue in ~5 min. The tests were at 234 (30) m.min(-1) and 251 (59) W, and times to fatigue were 297 (15) s and 298 (14) s, respectively. The overall rapidity of the VO(2)response was influenced by exercise mode [VO(2)max was achieved after 115 (20) s in running versus 207 (36) s in cycling; p<0.01]. VO(2) responses were fit to a three-phase exponential model. The time constant of the primary phase was faster in treadmill tests than in cycle ergometer tests [14 (6) s versus 25 (4) s; p<0.01], and the amplitude of the primary phase was greater in running than in cycling when it was expressed in absolute terms [2327 (393) ml.min(-1) versus 2036 (301) ml.min(-1); p=0.02] but not when it was expressed as a percentage of the total increase in VO(2) [86 (6)% versus 82 (6)%; p=0.09]. When quantified as the difference between the end-exercise VO(2) and the VO(2) at 2 min, the amplitude of the slow component was ~40% smaller in running [177 (92) ml.min(-1) versus 299 (153) ml min(-1); p=0.03]. It is concluded that exercise modality affects the characteristics of the VO(2) response at equivalent intensities in the severe domain.
本研究的目的是调查运动模式对重度强度范围内运动时摄氧量（VO₂）反应特征的影响。12名参与者分别进行了跑步机跑步测试和自行车测力计测试，直至疲劳，测试强度选择为引发特定模式的最大摄氧量（VO₂max）并在约5分钟内导致疲劳。跑步测试的速度为234（30）米·分钟⁻¹，功率为251（59）瓦，疲劳时间分别为297（15）秒；自行车测试的速度为234（30）米·分钟⁻¹，功率为251（59）瓦，疲劳时间分别为298（14）秒。VO₂反应的总体快速性受运动模式影响[跑步时在115（20）秒后达到VO₂max，而骑自行车时在207（36）秒后达到；p<0.01]。VO₂反应符合三相指数模型。跑步机测试中初级阶段的时间常数比自行车测力计测试中更快[14（6）秒对25（4）秒；p<0.01]，当以绝对值表示时，跑步时初级阶段的幅度大于骑自行车时[2327（393）毫升·分钟⁻¹对2036（301）毫升·分钟⁻¹；p=0.02]，但当以VO₂总增加量的百分比表示时则不然[86（6）%对82（6）%；p=0.09]。当量化为运动结束时的VO₂与2分钟时的VO₂之间的差异时，跑步时慢成分的幅度小约40%[177（92）毫升·分钟⁻¹对299（153）毫升·分钟⁻¹；p=0.03]。得出的结论是，在重度强度范围内，运动方式在同等强度下会影响VO₂反应的特征。
