School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UNITED KINGDOM.
School of Social and Health Sciences, Leeds Trinity University, Leeds, UNITED KINGDOM.
Med Sci Sports Exerc. 2020 Jan;52(1):67-76. doi: 10.1249/MSS.0000000000002121.
This study examined the efficacy of maximal sprint running accumulated during a typical school day to modulate postprandial metabolism in adolescent boys.
Nineteen adolescent boys completed three 2-d experimental conditions: a standard-practice control (CON), an accumulated in-school sprint running (ACC), and a single block of afterschool sprint running (BLO). On day 1, a fasting capillary blood sample was taken at 0735 h in the school. Three subsequent postprandial blood samples were taken at predetermined times after consumption of standardized breakfast and lunch. During ACC, participants accumulated four sets of 10 × 30-m maximal-intensity sprint runs across natural breaks in lessons. During BLO, participants performed the same number of sprints (40) in a single after-school exercise session. The blood samples from day 1 were replicated on the day after exercise (day 2).
On day 1, no significant differences in total area under the plasma triacylglycerol concentration versus time curve (TAUC-TAG) were observed between conditions (P = 0.126). However, TAUC-insulin was lower in ACC compared with BLO (-26%, effect size [ES] = 0.86, P = 0.001) and CON (-22%, ES = 0.72, P = 0.010). On day 2, TAUC-TAG was 12% lower after ACC (ES = 0.49; P = 0.002) and 10% lower after BLO (ES = 0.37; P = 0.019) compared with CON. No significant differences were observed between conditions on day 2 for postprandial insulin or glucose (P ≥ 0.738).
Four sets of 10 × 30-m sprints, accumulated in four separate bouts (<5 min) during the school day, reduced postprandial triacylglycerol and insulin concentrations in adolescent boys and may represent an effective in-school exercise strategy to promote metabolic health.
本研究旨在探讨在典型的学校日中积累最大冲刺跑的效果，以调节青少年男孩的餐后代谢。
19 名青少年男孩完成了三种 2 天的实验条件：标准实践对照（CON）、在校内积累的冲刺跑（ACC）和放学后单次冲刺跑（BLO）。在第 1 天，早上 0735 在学校采集空腹毛细血管血样。在进食标准化早餐和午餐后，按照预定时间采集随后的三个餐后血样。在 ACC 期间，参与者在课程的自然休息期间累计进行了四组 10×30 米的最大强度冲刺跑。在 BLO 期间，参与者在一次放学后的运动中完成了相同数量的冲刺（40 次）。第 1 天的血样在运动后的第二天（第 2 天）被复制。
在第 1 天，三个条件之间的血浆三酰甘油浓度-时间曲线下总面积（TAUC-TAG）没有显著差异（P=0.126）。然而，与 BLO（-26%，效应大小[ES] = 0.86，P=0.001）和 CON（-22%，ES = 0.72，P = 0.010）相比，ACC 时的 TAUC-胰岛素更低。在第 2 天，与 CON 相比，ACC 后 TAUC-TAG 降低了 12%（ES = 0.49；P = 0.002），BLO 后降低了 10%（ES = 0.37；P = 0.019）。在第 2 天，三个条件之间餐后胰岛素或葡萄糖没有显著差异（P≥0.738）。
在校内分四组进行，每组 10 次，每组 30 米，每组间隔不到 5 分钟，共 4 组，这种冲刺跑可降低青少年男孩的餐后三酰甘油和胰岛素浓度，可能代表一种有效的校内运动策略，可促进代谢健康。
