单次1小时中等强度运动对脂肪氧化动力学的影响。
Effect of a 1-hour single bout of moderate-intensity exercise on fat oxidation kinetics.
作者信息
Chenevière Xavier, Borrani Fabio, Ebenegger Vincent, Gojanovic Boris, Malatesta Davide
机构信息
Institute of Sport Sciences and Physical Education, University of Lausanne, 1015 Lausanne, Switzerland.
出版信息
Metabolism. 2009 Dec;58(12):1778-86. doi: 10.1016/j.metabol.2009.06.008. Epub 2009 Jul 25.
The present study aimed to examine the effects of a prior 1-hour continuous exercise bout (CONT) at an intensity (Fat(max)) that elicits the maximal fat oxidation (MFO) on the fat oxidation kinetics during a subsequent submaximal incremental test (IncrC). Twenty moderately trained subjects (9 men and 11 women) performed a graded test on a treadmill (Incr), with 3-minute stages and 1-km.h(-1) increments. Fat oxidation was measured using indirect calorimetry and plotted as a function of exercise intensity. A mathematical model (SIN) including 3 independent variables (dilatation, symmetry, and translation) was used to characterize the shape of fat oxidation kinetics and to determine Fat(max) and MFO. On a second visit, the subjects performed CONT at Fat(max) followed by IncrC. After CONT performed at 57% +/- 3% (means +/- SE) maximal oxygen uptake (Vo(2max)), the respiratory exchange ratio during IncrC was lower at every stage compared with Incr (P < .05). Fat(max) (56.4% +/- 2.3% vs 51.5% +/- 2.4% Vo(2max), P = .013), MFO (0.50 +/- 0.03 vs 0.40 +/- 0.03 g.min(-1), P < .001), and fat oxidation rates from 35% to 70% Vo(2max) (P < .05) were significantly greater during IncrC compared with Incr. However, dilatation and translation were not significantly different (P > .05), whereas symmetry tended to be greater in IncrC (P = .096). This study showed that the prior 1-hour continuous moderate-intensity exercise bout increased Fat(max), MFO, and fat oxidation rates over a wide range of intensities during the postexercise incremental test. Moreover, the shape of the postexercise fat oxidation kinetics tended to have a rightward asymmetry.
本研究旨在探讨在引发最大脂肪氧化（MFO）的强度（Fat(max)）下进行1小时的连续运动（CONT），对随后的次最大递增测试（IncrC）期间脂肪氧化动力学的影响。20名中度训练的受试者（9名男性和11名女性）在跑步机上进行了分级测试（Incr），每3分钟为一个阶段，速度以1 km·h⁻¹递增。使用间接量热法测量脂肪氧化，并将其绘制成运动强度的函数。采用一个包含3个自变量（扩张、对称和平移）的数学模型（SIN）来描述脂肪氧化动力学的形状，并确定Fat(max)和MFO。在第二次测试时，受试者先在Fat(max)强度下进行CONT，随后进行IncrC。在以57%±3%（均值±标准误）的最大摄氧量（Vo₂max）进行CONT后，IncrC期间每个阶段的呼吸交换率均低于Incr（P < 0.05）。与Incr相比，IncrC期间的Fat(max)（56.4%±2.3% vs 51.5%±2.4% Vo₂max，P = 0.013）、MFO（0.50±0.03 vs 0.40±0.03 g·min⁻¹，P < 0.001）以及35%至70% Vo₂max时的脂肪氧化率（P < 0.05）均显著更高。然而，扩张和平移没有显著差异（P > 0.05），而IncrC中的对称性倾向于更高（P = 0.096）。本研究表明，在运动后的递增测试中，先前1小时的连续中等强度运动使Fat(max)、MFO以及在广泛强度范围内的脂肪氧化率增加。此外，运动后脂肪氧化动力学的形状倾向于向右不对称。
Zotero 插件