Energy replacement diminishes the effect of exercise on postprandial lipemia in boys

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• 作者：Alice E. Thackray ; Laura A. Barrett ; Keith Tolfrey ; ^{K.Tolfrey@lboro.ac.uk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Cardiovascular disease risk ; Energy deficit ; Triacylglycerol ; Young people
• 刊名：Metabolism
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：65
• 期：4
• 页码：496-506
• 全文大小：584 K

文摘

Acute bouts of exercise reduce postprandial triacylglycerol concentrations ([TAG]) in healthy boys and girls; however, it is not known whether this effect is mediated by the energy deficit. This study examined whether the exercise-induced reduction in postprandial [TAG] persists after immediate dietary replacement of the exercise energy expenditure (EE).

Methods

Eighteen healthy 11- to 13-year-old boys (mean (SD): body mass 41.3 (8.4) kg; peak oxygen uptake (V̇O₂) 55 (5) mL·kg^− 1·min^− 1) completed three, 2-day conditions in a within-measures, crossover design separated by 14 days. On day 1, participants rested (CON), exercised at 60% peak V̇O₂ inducing a net EE of 32 kJ·kg^− 1 body mass (EX-DEF) or completed the same exercise with the net EE replaced immediately (EX-REP). On day 2, capillary blood samples were taken in the fasted state and at pre-determined intervals throughout the 6.5 h postprandial period. A standardised breakfast and lunch meal were consumed immediately and 4 h, respectively, after the fasting sample.

Results

Based on ratios of the geometric means (95% confidence intervals (CI) for ratios), EX-DEF fasting [TAG] was 19% and 15% lower than CON (− 32 to − 4%, ES = 1.15, P = 0.02) and EX-REP (− 29 to 0%, ES = 0.91, P = 0.05) respectively; CON and EX-REP were similar (− 4%; P = 0.59). The EX-DEF total area under the [TAG] versus time curve was 15% and 16% lower than CON (− 27 to 0%, ES = 0.55, P = 0.05) and EX-REP (− 29 to − 2%, ES = 0.62, P = 0.03) respectively; CON and EX-REP were not different (2%; − 13 to 20%, P = 0.80).

Conclusion

Immediate replacement of the exercise-induced energy deficit negates the reduction in postprandial [TAG] in boys; this highlights the importance of maintaining a negative energy balance immediately post-exercise to maximise the metabolic health benefits of exercise.