青春期男孩的餐后甘油三酯：适度运动的理由

Postprandial triacylglycerol in adolescent boys: a case for moderate exercise.

作者信息

Tolfrey Keith, Doggett Alex, Boyd Craig, Pinner Susan, Sharples Adam, Barrett Laura

机构信息

Research Institute for Health and Social Change, Department of Exercise and Sport Science, Manchester Metropolitan University, Alsager, UK.

出版信息

Med Sci Sports Exerc. 2008 Jun;40(6):1049-56. doi: 10.1249/MSS.0b013e31816770fe.

DOI:10.1249/MSS.0b013e31816770fe

PMID:18461002

Abstract

PURPOSE

To compare the effects of 60-min bouts of intermittent moderate and vigorous exercise on postprandial plasma triacylglycerol (TAG) metabolism in eight healthy adolescent boys (mean +/- SD age: 13 +/- 0.3 yr).

METHODS

Participants completed three conditions in a counterbalanced order. On day 1, they either rested for 110 min (CON), completed 6 x 10-min blocks of intermittent treadmill exercise at 53% peak V O2 (MOD), or 6 x 10-min blocks at 75% peak V O2 (VIG). On day 2 after a 12-h fast, a capillary blood sample was taken for [TAG] and [glucose] (mmol.L) and then a high-fat milkshake was consumed (1.50 g.kg fat, 1.22 g.kg CHO, and 0.22 g.kg protein; 80 kJ.kg). Further blood samples were taken every hour for a 6-h postprandial rest period for [TAG] and [glucose].

RESULTS

Estimated energy expenditure was 45% higher in VIG than in MOD (95% confidence interval [CI] 23-72%). Fasting [TAG] and [glucose] did not differ between the conditions. Average [TAG] for the postprandial period was lower by 24% in MOD (95% CI -47% to 9%, P = 0.06) and by 21% in VIG (95% CI -42% to 8%, P = 0.08) than CON, with no meaningful difference (4%; 95% CI -27% to 48%, P = 0.50) between MOD and VIG. The total area under the [TAG] versus time curve (mmol.L 6 h) was lower by 24% in MOD (95% CI -42% to 0%, P = 0.05) and by 20% in VIG (95% CI -37% to 0%, P = 0.07) than CON. MOD and VIG were not different from each other (4%; 95% CI -18% to 32%, P = 0.54).

CONCLUSION

Both 60 min of moderate and vigorous intermittent exercises reduced postprandial [TAG]. However, the extra energy expended in the vigorous condition did not produce a dose-related reduction compared with the moderate-intensity condition.

摘要

目的

比较8名健康青春期男孩（平均±标准差年龄：13±0.3岁）进行60分钟间歇性中等强度和高强度运动对餐后血浆三酰甘油（TAG）代谢的影响。

方法

参与者按平衡顺序完成三种情况。第1天，他们要么休息110分钟（CON），要么以峰值摄氧量（V̇O₂）的53%进行6组每组10分钟的间歇性跑步机运动（MOD），要么以峰值V̇O₂的75%进行6组每组10分钟的运动（VIG）。在禁食12小时后的第2天，采集毛细血管血样检测[TAG]和[葡萄糖]（mmol/L），然后饮用高脂奶昔（1.50 g/kg脂肪、1.22 g/kg碳水化合物和0.22 g/kg蛋白质；80 kJ/kg）。在餐后6小时的休息期每小时采集更多血样检测[TAG]和[葡萄糖]。

结果

VIG组的估计能量消耗比MOD组高45%（95%置信区间[CI] 23 - 72%）。各情况之间的空腹[TAG]和[葡萄糖]无差异。与CON组相比，MOD组餐后平均[TAG]降低24%（95% CI -47%至9%，P = 0.06），VIG组降低21%（95% CI -42%至8%，P = 0.08），MOD组和VIG组之间无显著差异（4%；95% CI -27%至48%，P = 0.50）。[TAG]随时间变化曲线下的总面积（mmol/L·6小时），MOD组比CON组低24%（95% CI -42%至0%，P = 0.05），VIG组比CON组低20%（95% CI -37%至0%，P = 0.07）。MOD组和VIG组之间无差异（4%；95% CI -18%至32%，P = 0.54）。