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Children recover faster than adults in repeated sprints, but it is unclear if their aerobic responses differ. Purpose: This study tested the hypothesis that aerobic response (VO2) 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 as a covariate. Methods: 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 (VO2) was measured continuously. Results: Men’s mean power output was greater than boys in each sprint, both in absolute (unscaled) values (p < 0.05) and when adjusted for lean leg volume (p < 0.05). Children had lower absolute VO2 (p < 0.05) than men, but when it was adjusted for body mass or power-output, VO2 was comparable between men and boy

United statesNorthern ostrobothniaEteläuomen läiVan praaghActa physiolBiopac systems incKapodistrian university of athensHelsinki declarationMonark exercisePolar electroResistive loadBlood lactateKapodistrian universityMed abstractCrossref full textHigh intensity exercise