BMC public health · 2025
Age- and sex-specific differences in repetitive sprinting in 9-14-year-olds living in Turkey.
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Can İbrahim, Ataş Bilgin, Smits-Engelsman Bouwien C M
Аннотация
BACKGROUND: Since children's daily activities are mostly anaerobic, it is important to assess anaerobic performance as part of the physical assessment. Therefore, running speed, power, and heart rate during repetitive sprints were investigated.
METHOD: A total of 118 children participated (mean age:11.5 range 9-14y; 48% boys, 52% girls) and performed the children's repetitive and intermittent sprinting performance (CRISP) test, which consists of six sprint runs performed at maximal speed over 30-meter with short recovery periods (10 s) between each run. GLM Repeated Measures were used to examine the effect of runs (within-subject factor) and age and sex (between-subject factor) and as well as possible interactions for running time, power, and heart rate.
RESULTS: Running times increased significantly across runs (p < 0.001, large effect size), showing a non-linear slowdown (p = 0.013). Also, a main effect of age, [p < 0.033] and sex [p < 0.011, medium effect size] emerged. However, interaction effects showed that girls fatigued more in the second half of the test, which led to larger differences with the boys in the later runs of the CRISP. Moreover, the interaction effect of age-by-run-by-sex was found. Eleven-year-old children had the longest running times. At the same time, young children, predominantly boys, showed less fatigue, as their last runs were comparable in time to the first ones. Analysis of the power showed a main effect of age, indicating more power in older children [p < 0.001, large effect size], especially after 11 years. No differences between sexes were found for power. Heart rate increased significantly during the repetitive sprinting [p < 0.001, large effect size]. No differences for age or sex were found for mean or peak heart rate.
CONCLUSION: The CRISP test is sensitive to running fatigue [large effect size] and distinguishes between the performance characteristics of children according to age and sex. Running speed and power go up between 12 and 14 years. Girls run slower but generate comparable power over the runs. Yet they fatigue more in the second half of the test than boys.
METHOD: A total of 118 children participated (mean age:11.5 range 9-14y; 48% boys, 52% girls) and performed the children's repetitive and intermittent sprinting performance (CRISP) test, which consists of six sprint runs performed at maximal speed over 30-meter with short recovery periods (10 s) between each run. GLM Repeated Measures were used to examine the effect of runs (within-subject factor) and age and sex (between-subject factor) and as well as possible interactions for running time, power, and heart rate.
RESULTS: Running times increased significantly across runs (p < 0.001, large effect size), showing a non-linear slowdown (p = 0.013). Also, a main effect of age, [p < 0.033] and sex [p < 0.011, medium effect size] emerged. However, interaction effects showed that girls fatigued more in the second half of the test, which led to larger differences with the boys in the later runs of the CRISP. Moreover, the interaction effect of age-by-run-by-sex was found. Eleven-year-old children had the longest running times. At the same time, young children, predominantly boys, showed less fatigue, as their last runs were comparable in time to the first ones. Analysis of the power showed a main effect of age, indicating more power in older children [p < 0.001, large effect size], especially after 11 years. No differences between sexes were found for power. Heart rate increased significantly during the repetitive sprinting [p < 0.001, large effect size]. No differences for age or sex were found for mean or peak heart rate.
CONCLUSION: The CRISP test is sensitive to running fatigue [large effect size] and distinguishes between the performance characteristics of children according to age and sex. Running speed and power go up between 12 and 14 years. Girls run slower but generate comparable power over the runs. Yet they fatigue more in the second half of the test than boys.