Muscat Kristina M, Kotrach Houssam G, Wilkinson-Maitland Courtney A, Schaeffer Michele R, Mendonca Cassandra T, Jensen Dennis
a Clinical Exercise and Respiratory Physiology Laboratory, Department of Kinesiology and Physical Education, McGill University, Montréal, QC H2W 1S4, Canada.
b Respiratory Epidemiology and Clinical Research Unit, Montréal Chest Institute, McGill University Health Centre, Montréal, QC H4A 3J1, Canada.
Appl Physiol Nutr Metab. 2015 Nov;40(11):1199-209. doi: 10.1139/apnm-2015-0179. Epub 2015 Aug 4.
In a randomized cross-over study of 15 healthy men aged 20-30 years, we compared physiological and perceptual responses during treadmill and cycle exercise test protocols matched for increments in work rate - the source of increased locomotor muscle metabolic and contractile demands. The rates of O2 consumption and CO2 production were higher at the peak of treadmill versus cycle testing (p ≤ 0.05). Nevertheless, work rate, minute ventilation, tidal volume (VT), breathing frequency (fR), inspiratory capacity (IC), inspiratory reserve volume (IRV), tidal esophageal (Pes,tidal) and transdiaphragmatic pressure swings (Pdi,tidal), peak expiratory gastric pressures (Pga,peak), the root mean square of the diaphragm electromyogram (EMGdi,rms) expressed as a percentage of maximum EMGdi,rms (EMGdi,rms%max), and dyspnea ratings were similar at the peak of treadmill versus cycle testing (p > 0.05). Ratings of leg discomfort were higher at the peak of cycle versus treadmill exercise (p ≤ 0.05), even though peak O2 consumption was lower during cycling. Oxygen consumption, CO2 production, minute ventilation, fR, Pes,tidal, Pdi,tidal and Pga,peak were higher (p ≤ 0.05), while VT, IC, IRV, EMGdi,rms%max, and ratings of dyspnea and leg discomfort were similar (p > 0.05) at all or most submaximal work rates during treadmill versus cycle exercise. Our findings highlight important differences (and similarities) in physiological and perceptual responses at maximal and submaximal work rates during incremental treadmill and cycle exercise testing protocols. The lack of effect of exercise test modality on peak work rate advocates for the use of this readily available parameter to optimize training intensity determination, regardless of exercise training mode.
在一项针对15名年龄在20至30岁之间的健康男性的随机交叉研究中，我们比较了跑步机运动和自行车运动测试方案中，在工作负荷增加（这是运动肌肉代谢和收缩需求增加的来源）相匹配时的生理和感知反应。跑步机测试峰值时的耗氧率和二氧化碳产生率高于自行车测试（p≤0.05）。然而，在跑步机测试和自行车测试峰值时，工作负荷、分钟通气量、潮气量（VT）、呼吸频率（fR）、吸气量（IC）、吸气储备量（IRV）、潮气量时的食管压力（Pes,tidal）和跨膈压摆动（Pdi,tidal）、呼气峰值时的胃内压（Pga,peak）、以最大膈肌肌电图（EMGdi,rms）百分比表示的膈肌肌电图均方根（EMGdi,rms%max）以及呼吸困难评分相似（p>0.05）。尽管自行车运动时的峰值耗氧量较低，但自行车运动峰值时的腿部不适评分高于跑步机运动（p≤0.05）。在跑步机运动和自行车运动的所有或大多数次最大工作负荷时，耗氧量、二氧化碳产生量、分钟通气量、fR、Pes,tidal、Pdi,tidal和Pga,peak较高（p≤0.05），而VT、IC、IRV、EMGdi,rms%max以及呼吸困难和腿部不适评分相似（p>0.05）。我们的研究结果突出了递增式跑步机运动和自行车运动测试方案在最大和次最大工作负荷时生理和感知反应的重要差异（和相似之处）。运动测试方式对峰值工作负荷无影响，这支持使用这个易于获得的参数来优化训练强度的确定，而不论运动训练模式如何。
