Ramos-Jiménez Arnulfo, Hernández-Torres Rosa P, Torres-Durán Patricia V, Romero-Gonzalez Jaime, Mascher Dieter, Posadas-Romero Carlos, Juárez-Oropeza Marco A
Department of Basic Science, Biomedical Science Institute, UACJ, Cd. Juarez Chih, Mexico.
Clin Med Circ Respirat Pulm Med. 2008 Feb 1;2:1-9. doi: 10.4137/ccrpm.s449.
The respiratory exchange ratio (RER) indirectly shows the muscle's oxidative capacity to get energy. Sedentarism, exercise and physically active lifestyles modify it. For that reason, this study evaluates the associations between RER during sub-maximum exercise and other well established fitness indicators (body fat, maximum heart rate, maximum O(2) uptake, workload, and lactate threshold), in physically active trained and untrained men.
The RER, O(2) uptake and blood lactate were measured in eight endurance trained and eight untrained men (age, 22.9 ± 4.5 vs. 21.9 ± 2.8 years; body mass, 67.1 ± 5.4 vs. 72.2 ± 7.7 kg; body fat, 10.6 ± 2.4% vs. 16.6 ± 3.8% and maximum O(2) uptake, 68.9 ± 6.3 vs. 51.6 ± 5.8 ml•kg(-1)•min(-1)), during maximum exercise test and during three different sub-maximum exercises at fixed workload: below, within or above the lactate threshold.
Endurance trained men presented higher O(2) uptake, lower blood lactate concentrations and lower RER values than those in untrained men at the three similar relative workloads. Even though with these differences in RER, a strong association (p < 0.05) of RER during sub-maximum exercise with the other well established fitness indicators was observed, and both maximum O(2) uptake and lactate threshold determined more than 57% of its variance (p < 0.05).
These data demonstrate that RER measurement under sub-maximum exercise conditions was well correlated with other established physical fitness indicators, despite training condition. Furthermore, the results suggest that RER could help obtain an easy approach of fitness status under low exercise intensity and could be utilized in subjects with reduced exercise tolerance.
呼吸交换率（RER）间接反映肌肉获取能量的氧化能力。久坐不动、运动及积极的生活方式会对其产生影响。因此，本研究评估了在次最大运动期间，RER与其他已确立的健康指标（体脂、最大心率、最大摄氧量、工作量和乳酸阈值）之间的关联，研究对象为有运动习惯的训练者和未训练者。
在最大运动测试期间以及在三种不同的固定工作量次最大运动期间（低于、处于或高于乳酸阈值），对八名耐力训练者和八名未训练者（年龄，22.9±4.5岁对21.9±2.8岁；体重，67.1±5.4千克对72.2±7.7千克；体脂，10.6±2.4%对16.6±3.8%；最大摄氧量，68.9±6.3对51.6±5.8毫升·千克⁻¹·分钟⁻¹）测量RER、摄氧量和血乳酸。
在三种相似的相对工作量下，耐力训练者比未训练者表现出更高的摄氧量、更低的血乳酸浓度和更低的RER值。尽管RER存在这些差异，但在次最大运动期间，RER与其他已确立的健康指标之间仍存在强关联（p<0.05），最大摄氧量和乳酸阈值共同决定了其超过57%的方差（p<0.05）。
这些数据表明，尽管存在训练状态差异，但在次最大运动条件下测量的RER与其他已确立的体能指标密切相关。此外，结果表明，RER有助于在低运动强度下轻松评估健康状况，并可用于运动耐量降低的受试者。
