Key result
Repeated 6-second maximal cycle sprints negated postprandial reductions in flow-mediated dilation and lowered the plasma triacylglycerol area under the curve by 13% (P<0.05) in adolescent boys.
Why the study?
Do repeated maximal cycle sprints improve postprandial endothelial function and triacylglycerol concentrations following high-fat meals in adolescent boys?
RCT (n=9)
counter-balanced
Do repeated maximal cycle sprints improve postprandial endothelial function and triacylglycerol concentrations following high-fat meals in adolescent boys?
Effect estimate: 13% lower
Absolute Event Rate: 8.65% vs 9.92%
p-value: p=< 0.05
Repeated short-duration maximal sprints can prevent high-fat meal-induced endothelial dysfunction and reduce postprandial triacylglycerol concentrations in adolescent boys.
Supports pre-meal sprint exercise to blunt endothelial impairment after high-fat meals in boys; extends adult RCT evidence to adolescents.
This study investigated whether repeated, very short duration sprints influenced endothelial function (indicated by flow-mediated dilation) and triacylglycerol concentrations following the ingestion of high-fat meals in adolescent boys. Nine adolescent boys completed two, 2-day main trials (control and exercise), in a counter-balanced, cross-over design. Participants were inactive on day 1 of the control trial but completed 40 × 6 s maximal cycle sprints on day 1 of the exercise trial. On day 2, capillary blood samples were collected and flow-mediated dilation measured prior to, and following, ingestion of a high-fat breakfast and lunch. Fasting flow-mediated dilation and plasma triacylglycerol concentration were similar in the control and exercise trial (P > 0.05). In the control trial, flow-mediated dilation was reduced by 20% and 27% following the high-fat breakfast and lunch; following exercise these reductions were negated (main effect trial, P < 0.05; interaction effect trial × time, P < 0.05). The total area under the plasma triacylglycerol concentration versus time curve was 13% lower on day 2 in the exercise trial compared to the control trial (8.65 (0.97) vs. 9.92 (1.16) mmol · l(-1) · 6.5 h, P < 0.05). These results demonstrate that repeated 6 s maximal cycle sprints can have beneficial effects on postprandial endothelial function and triacylglycerol concentrations in adolescent boys.
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Sedgwick et al. (2014) reported an RCT. Repeated maximal cycle sprints vs. Inactive control was evaluated on Total area under the plasma triacylglycerol concentration versus time curve (mmol · l(-1) · 6.5 h) (13% lower, p=< 0.05). Repeated 6-second maximal cycle sprints negated postprandial reductions in flow-mediated dilation and lowered the plasma triacylglycerol area under the curve by 13% (P<0.05) in adolescent boys.
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