Effect of energy expenditure on postprandial triacylglycerol in adolescent boys

Abstract

This study examined the effects of 30 and 60 min of moderate intensity exercise on postprandial triacylglycerol concentration [TAG] in 11 healthy, 13-year-old boys. The boys completed three counterbalanced conditions. On day 1, they either rested (CON), or jogged for 30 min (EX30) or 60 min (EX60) at 55% peak [Formula: see text] Following a 12-h fast, on day 2 a capillary blood sample was taken for fasting [TAG] before a high fat milkshake was consumed. Further blood samples were taken every hour over a 6-h postprandial rest period for [TAG]. The estimated energy expenditure for EX30 (982 kJ) was doubled in EX60 (1967 kJ). Differences in fasting [TAG] between the conditions were small (ES = 0.23, P = 0.35). Differences in postprandial TAG over time between conditions were identified (ES = 0.41, P = 0.03). Mean [TAG] was lower in EX60 than CON (-33 to -3%, P = 0.03) with a similar strong trend for EX30 (-29 to 1%, P = 0.06); EX60 and EX30 were not different from each other (-21 to 14%, P = 0.62). The total area under the [TAG] versus time curve was different between conditions (ES = 0.42, P = 0.03). Again, EX60 was lower than CON (-31 to -2%, P = 0.02) with a strong trend for EX30 (-31 to 4%, P = 0.06); EX30 and EX60 were not different from each other (-17 to 16%, P = 0.58). This study shows for the first time that both 30 and 60 min of jogging, with energy expenditures equivalent to 982 and 1,967 kJ, attenuates postprandial [TAG] in adolescent boys, but not in a dose-dependent manner.

Effect of repeated sprints on postprandial endothelial function and triacylglycerol concentrations in adolescent boys

“…In previous studies in adolescents, moderate-intensity exercise has been reported to reduce the total area under the plasma triacylglycerol concentrations versus time curve by 8 to 22% (Barrett et al, 2007;Lee et al, 2013;MacEneaney et al, 2009;Sedgwick et al, 2013;Tolfrey et al, 2008;Tolfrey et al, 2012) and high-intensity exercise (10 x 1 min run at 100% peak oxygen uptake) by 11% (Thackray, Barrett, & Tolfrey, 2013). In the present study the corresponding reduction was 13%, demonstrating that repeated bouts of very short (6 s) maximal sprints are effective at reducing postprandial triacylglycerol concentrations.…”

“…A single 30 to 180 min session of moderate-intensity exercise completed 12 to 18 h prior to the ingestion of a high-fat meal has consistently been shown to lower postprandial triacylglycerol concentrations (Barrett, Morris, Stensel, & Nevill, 2006;Barrett, Morris, Stensel, & Nevill, 2007;Gill et al, 2004;Lee, Burns, Kuk, & Arslanian, 2013;MacEneaney et al, 2009;Petitt & Cureton, 2003;Sedgwick et al, 2013;Tolfrey et al, 2008;Tolfrey et al, 2012) and more recently to attenuate postprandial endothelial dysfunction in both adults and adolescents (Gill et al, 2004;Sedgwick et al, 2013;Tyldum et al, 2009). …”

Acute Exercise and Postprandial Lipemia in Young People

“…A critical feature of the two-day model is that the exercise intervention precedes the first blood sample by 12 to 18 hours (Table 1). This is because lipoprotein lipase (LPL) activity appears to peak in this period after exercise (71) , it is likely the energy expenditure was lower than that reported in other studies in young people adopting longer and less intense exercise interventions (3,41,42,70,78,80,81), suggesting that exercise intensity is a key factor influencing postprandial TAG metabolism in young people. Importantly, the exercise protocol was well tolerated by the boys in this study, and recent evidence suggests that pre-pubertal boys prefer moderate intensity exercise interspersed with short bursts of high intensity effort compared with continuous moderate intensity exercise alone (9).…”

“…While it appears that a 'threshold' of exercise energy expenditure may be required to promote a meaningful reduction in the postprandial TAG response, the evidence of a dose-dependent response is not yet supported directly in boys or girls (78,80,81).…”

“…Nine studies have investigated the effect of acute exercise on postprandial lipemia in young people using the criteria adopted for this summary (3,41,42,69,70,76,78,80,81). A summary of these studies is presented in Thus, an exercise-induced deficit is efficacious, but a closer examination of the exercise characteristics might be more enlightening and will be used to compare and contrast the main outcomes with the adult-based literature appraised above.…”