Tsetsonis N V, Hardman A E
Department of Physical Education, Sports Science and Recreation Management, Loughborough University, Leicestershire, United Kingdom.
Med Sci Sports Exerc. 1996 Oct;28(10):1235-42. doi: 10.1097/00005768-199610000-00005.
This study compared the effects of low and moderate intensity walking on postprandial lipemia, holding energy expenditure constant. Nine healthy normolipidemic subjects (5 men, 4 women; age 27.7 +/- 0.9, fasting, plasma triacylglycerol 0.95 +/- 0.18 mmol.l-1, mean +/- SEM) who were physically active but not endurance-trained undertook three trials, each over 2 d, in a balanced design. On the afternoon of day 1 they either refrained from exercise (Control), walked for 3 h at low intensity (Walk low, 32 +/- 1% VO2max), or walked for 1.5 h at moderate intensity (Walk moderate, 63 +/- 1% VO2max). The following morning, after a 12-h fast, they consumed a high-fat meal (1.3 g fat, 1.2 g carbohydrate, 0.2 g protein, 76 kJ energy per kg body mass). Blood and expired air samples were obtained before the meal and for 6 h afterward. Postprandial lipemia (total area under triacylglycerol concentration vs time curve) was lower than control after low intensity walking as well as after moderate intensity walking (both P < 0.05) but did not differ between the two walking trials (Control, 8.09 +/- 1.09 mmol.l-1 h; Walk low, 5.46 +/- 0.63 mmol.l-1.h; Walk moderate, 5.53 +/- 0.58 mmol.l-1.h). The increase in energy production following the test meal did not differ between trials, but fat oxidation was increased in the fasting and postprandial states for both walking trials, compared with control (P < 0.05).
本研究在保持能量消耗恒定的情况下，比较了低强度和中等强度步行对餐后血脂的影响。九名健康的血脂正常受试者（5名男性，4名女性；年龄27.7±0.9岁，空腹血浆三酰甘油0.95±0.18 mmol·l⁻¹，均值±标准误），他们身体活跃但未经过耐力训练，采用平衡设计进行了三项试验，每项试验为期2天。在第1天下午，他们要么不进行运动（对照组），要么以低强度步行3小时（低强度步行组，32±1%最大摄氧量），要么以中等强度步行1.5小时（中等强度步行组，63±1%最大摄氧量）。次日早晨，禁食12小时后，他们食用了一顿高脂肪餐（每千克体重含1.3克脂肪、1.2克碳水化合物、0.2克蛋白质、76千焦能量）。在进餐前及进餐后6小时采集血液和呼出气体样本。低强度步行后以及中等强度步行后，餐后血脂（三酰甘油浓度与时间曲线下的总面积）均低于对照组（均P<0.05），但两次步行试验之间无差异（对照组，8.09±1.09 mmol·l⁻¹·小时；低强度步行组，5.46±0.63 mmol·l⁻¹·小时；中等强度步行组，5.53±0.58 mmol·l⁻¹·小时）。试验餐之后的能量产生增加在各试验之间无差异，但与对照组相比，两次步行试验在禁食和餐后状态下的脂肪氧化均增加（P<0.05）。
