Postprandial Triacylglycerol in Adolescent Boys

Abstract

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.

Exercise intensity and postprandial health outcomes in adolescents

“…The EE of exercise may be important in modulating the lipaemic response (Gill et al 2002) and may explain our findings in adolescent boys. The current study induced a lower EE (~ 650 kJ) than previous investigations in adolescent boys (~ 1-2.5 MJ Tolfrey et al 2008), and adult studies which reported a reduction in PPL using a similar 1 day protocol to that adopted in the present study (4.6 MJ (Katsanos et al 2004)). Interestingly, our EE was similar to that used by Pfeiffer et al (630 kJ), who failed to observe a reduction in PPL in healthy young men (Pfeiffer et al 2006), and may indicate that the EE in the present study was insufficient to reduce PPL in boys.…”

“…In addition, the ES for this finding was either small (HIIE) or trivial (MIE), suggesting no meaningful effect on the IAUC-TAG outcome for boys. This result is surprising given the well documented beneficial effect of MIE and HIIE exercise on plasma [TAG] following a HFM in adolescent boys (ES range from 0.39 to 1.40) Tolfrey et al 2008). A possible explanation for this lack of effect in boys in the present study could reside in the adoption of a single day protocol, as PPL may be attenuated to a greater degree when exercise is performed 12 h compared to 1 h after exercise in adult males (Zhang et al 1998), possibly due to a delayed increase in activity of lipoprotein lipase (LPL) (Seip and Semenkovich 1998).…”

“…It is known that 60 min of intermittent or continuous exercise at a moderate to vigorous intensity (50-75% ̇O 2 peak ) can reduce PPL by ~ 20-30% in male and female adolescents Tolfrey et al 2008;Tolfrey et al 2013). Furthermore, 30 min of moderate exercise (<1 MJ) was similarly effective at reducing PPL as 60 min in 13 year old boys , indicating that even a small volume of exercise may have a beneficial effect on PPL.…”

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).…”

“…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.…”