Response to: Methodological Rigor in Reference Chart Development: A Comment on “Normative Reference Centiles for Sprint Performance in High-Level Youth Soccer Players: The Need to Consider Biological Maturity”

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Ludwig Ruf TSG ResearchLab gGmbH, Zuzenhausen, Germany
TSG 1899 Hoffenheim, Zuzenhausen, Germany

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Stefan Altmann TSG ResearchLab gGmbH, Zuzenhausen, Germany
Department for Performance Analysis, Institute of Sports and Sports Science, Karlsruhe Institute of Technology, Karlsruhe, Germany

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Christian Kloss TSG 1899 Hoffenheim, Zuzenhausen, Germany

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Sascha Härtel TSG 1899 Hoffenheim, Zuzenhausen, Germany

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  • 1.

    Cumming S, Pi-Rusiñol R, Rodas G, Drobnic F, Rogol A. The validity of automatic methods for estimating skeletal age in young athletes: a comparison of the BAUSport Ultrasound System and BoneXpert with the radiographic method of FELS. Biol Sport. 2024;41:617. doi:

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  • 2.

    Datson N, Weston M, Drust B, Atkinson G, Lolli L, Gregson W. Reference values for performance test outcomes relevant to English female soccer players. Sci Med Footb. 2022;6:58996. doi:

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  • 3.

    Lolli, L. Methodological rigor in reference chart development: a comment on “Normative Reference Centiles for Sprint Performance in High-Level Youth Soccer Players: The Need to Consider Biological Maturity.” Pediatr Exerc Sci. 2024. doi:

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  • 4.

    Lolli L, Di Salvo V, Monaco M, Johnson A, Gregson W. A comparison of FELS and Tanner-Whitehouse II skeletal ages in male youth soccer players from the Middle East. Am J Hum Biol. 2023;35:e23941. doi:

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  • 5.

    Lolli L, Gregson W, Bonanno D, Kuitunen S, Di Salvo V. Age-related reference intervals for physical performance test outcomes relevant to male youth middle eastern football players. Int J Sports Physiol Perform. 2023;18:128395. doi:

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  • 6.

    Malina RM. Skeletal age and age verification in youth sport. Sports Med. 2011;41:92547. doi:

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    Malina RM, Bouchard C, Bar-Or O. Growth, Maturation, and Physical Activity. 2nd ed. Human Kinetics; 2004.

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    Malina RM, Rogol AD, Cumming SP, Coelho-e-Silva MJ, Figueiredo AJ. Biological maturation of youth athletes: assessment and implications. Br J Sports Med. 2015;49:8529. doi:

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  • 9.

    Myburgh GK, Cumming SP., Coelho-e-Silva MJ, Malina RM. Developmental fitness curves: assessing sprint acceleration relative to age and maturity status in elite junior tennis players. Ann Hum Biol. 2020;47:33645. doi:

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  • 10.

    Ohuma EO, Altman DG, for the International Fetal and Newborn Growth Consortium for the 21st Century (INTERGROWTH-21st Project). Design and other methodological considerations for the construction of human fetal and neonatal size and growth charts. Stat Med. 2019;38:352739. doi:

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  • 11.

    Ruf L, Altmann S, Kloss C, Härtel S. Normative reference centiles for sprint performance in high-level youth soccer players: the need to consider biological maturity. Pediatr Exerc Sci. 2024;19. doi:

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    • Export Citation
  • 12.

    Tanner JM, Whitehouse RH, Cameron N, Mashall WA, Healy MJR, Goldstein H. Assessment of Skeletal Maturity and Prediction of Adult Height (TW2 Method). 2nd ed. Academic Press; 1983.

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  • 13.

    Zemel BS. From growth charts to growth status: how concepts of optimal growth and tempo influence the interpretation of growth measurements. Ann Hum Biol. 2023;50:23646. doi:

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