Theos Apostolos, Bogdanis Gregory C, Jansson Daniel, Nevill Alan M, Papaspyrou Aggeliki, Maridaki Maria
Section of Sports Medicine, Department of Community Medicine and Rehabilitation, Umeå University, Umeå, Sweden.
Umeå School of Sport Sciences, Umeå University, Umeå, Sweden.
Front Physiol. 2022 Mar 11;13:814056. doi: 10.3389/fphys.2022.814056. eCollection 2022.
Children recover faster than adults in repeated sprints, but it is unclear if their aerobic responses differ.
This study tested the hypothesis that aerobic response (VO) during repeated sprints is greater in preadolescent boys than in men. Further, this study compared normalization with conventional ratio-scaling and scaling with the use of body mass (BM) as a covariate.
Nine boys (age: 11.8 ± 0.6 years, swimmers) and 11 men (age: 21.7 ± 0.6 years, recreational athletes) performed 10 maximal 6-s cycling sprints separated by 24-s of passive recovery, against two loads (optimum and 50% of optimum). Oxygen uptake (VO) was measured continuously.
Men's mean power output (MPO) was greater than boys in each sprint, both in absolute (unscaled) values ( < 0.05) and when adjusted for lean leg volume ( < 0.05). Children had lower absolute VO ( < 0.05) than men, but when it was adjusted for BM or power-output, VO was comparable between men and boys. Thus, most of the difference in VO between men and boys was due to body size and power-output differences.
Our results suggest that men and boys have similar VO during repeated sprints when appropriately adjusted to body mass or power output. Results highlight the importance of using appropriate scaling methods to compare adults' and children's aerobic responses to high-intensity exercise.
儿童在重复冲刺中比成年人恢复得更快，但尚不清楚他们的有氧反应是否存在差异。
本研究检验了这样一个假设，即青春期前男孩在重复冲刺期间的有氧反应（VO）比男性更大。此外，本研究比较了使用传统比率缩放法进行标准化与以体重（BM）作为协变量进行缩放的情况。
9名男孩（年龄：11.8±0.6岁，游泳运动员）和11名男性（年龄：21.7±0.6岁，业余运动员）进行10次最大时长为6秒的自行车冲刺，每次冲刺之间有24秒的被动恢复时间，对抗两种负荷（最佳负荷和最佳负荷的50%）。连续测量摄氧量（VO）。
在每次冲刺中，男性的平均功率输出（MPO）无论是绝对值（未缩放）（<0.05）还是在根据瘦腿体积进行调整后（<0.05）都大于男孩。儿童的绝对VO低于男性（<0.05），但在根据体重或功率输出进行调整后，男性和男孩的VO相当。因此，男性和男孩在VO上的大部分差异是由于体型和功率输出的差异。
我们的结果表明，当根据体重或功率输出进行适当调整时，男性和男孩在重复冲刺期间的VO相似。结果强调了使用适当的缩放方法来比较成年人和儿童对高强度运动的有氧反应的重要性。
