Effect of exercise modality on oxygen uptake kinetics during heavy exercise.

A M Jones, A M McConnell
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引用次数: 82

Abstract

The mechanisms responsible for the oxygen uptake (VO2) slow component during high-intensity exercise have yet to be established. In order to explore the possibility that the VO2 slow component is related to the muscle contraction regimen used, we examined the pulmonary VO2 kinetics during constant-load treadmill and cycle exercise at an exercise intensity that produced the same level of lactacidaemia for both exercise modes. Eight healthy subjects, aged 22-37 years, completed incremental exercise tests to exhaustion on both a cycle ergometer and a treadmill for the determination of the ventilatory threshold (defined as the lactate threshold, Th1a) and maximum VO2 (VO2max). Subsequently, the subjects completed two "square-wave" transitions from rest to a running speed or power output that required a VO2 that was halfway between the mode-specific Th1a and VO2max. Arterialised blood lactate concentration was determined immediately before and after each transition. The VO2 responses to the two transitions for each exercise mode were time-aligned and averaged. The increase in blood lactate concentration produced by the transitions was not significantly different between cycling [mean (SD) 5.9 (1.5) mM] and running [5.5 (1.6) mM]. The increase in VO2 between 3 and 6 min of exercise; (i.e. the slow component) was significantly greater in cycling than in running, both in absolute terms [290 (102) vs 200 (45) ml x min(-1); P<0.05] and as a proportion of the total VO2 response above baseline [10 (3)% vs 6 (1)%; P < 0.05]. These data indicate that: (a) a VO2 slow component does exist for high-intensity treadmill running, and (b) the magnitude of the slow component is less for running than for cycling at equivalent levels of lactacidaemia. The greater slow component observed in cycling compared to running may be related to differences in the muscle contraction regimen that is required for the two exercise modes.

运动方式对大强度运动中氧摄取动力学的影响。
高强度运动中氧摄取(VO2)缓慢组分的机制尚未确定。为了探索VO2缓慢组分与所使用的肌肉收缩方案相关的可能性,我们在恒定负荷的跑步机和循环运动中检查了肺部VO2动力学,在运动强度下,两种运动模式产生相同水平的乳酸血症。8名健康受试者,年龄22-37岁,在循环测力仪和跑步机上完成增量运动测试,直至精疲力竭,以确定通气阈值(定义为乳酸阈值Th1a)和最大摄氧量(VO2max)。随后,受试者完成了从休息到跑步速度或功率输出的两次“方波”转换,这需要VO2介于特定模式的Th1a和VO2max之间。在每次转换前后立即测定动脉化血乳酸浓度。对每种运动模式的两个转换的VO2反应是时间对齐和平均的。在循环[mean (SD) 5.9 (1.5) mM]和跑步[5.5 (1.6)mM]之间,过渡产生的血乳酸浓度的增加没有显著差异。运动3 - 6分钟的VO2增加;(即慢速成分)在骑车时明显大于跑步时,无论是绝对值[290 (102)vs 200 (45) ml x min(-1)];P
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