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. 2023 Mar;57(5):299-310.
doi: 10.1136/bjsports-2022-106176. Epub 2023 Jan 9.

European fitness landscape for children and adolescents: updated reference values, fitness maps and country rankings based on nearly 8 million test results from 34 countries gathered by the FitBack network

Affiliations

European fitness landscape for children and adolescents: updated reference values, fitness maps and country rankings based on nearly 8 million test results from 34 countries gathered by the FitBack network

Francisco B Ortega et al. Br J Sports Med. 2023 Mar.

Abstract

Objectives: (1) To develop reference values for health-related fitness in European children and adolescents aged 6-18 years that are the foundation for the web-based, open-access and multilanguage fitness platform (FitBack); (2) to provide comparisons across European countries.

Methods: This study builds on a previous large fitness reference study in European youth by (1) widening the age demographic, (2) identifying the most recent and representative country-level data and (3) including national data from existing fitness surveillance and monitoring systems. We used the Assessing Levels of PHysical Activity and fitness at population level (ALPHA) test battery as it comprises tests with the highest test-retest reliability, criterion/construct validity and health-related predictive validity: the 20 m shuttle run (cardiorespiratory fitness); handgrip strength and standing long jump (muscular strength); and body height, body mass, body mass index and waist circumference (anthropometry). Percentile values were obtained using the generalised additive models for location, scale and shape method.

Results: A total of 7 966 693 test results from 34 countries (106 datasets) were used to develop sex-specific and age-specific percentile values. In addition, country-level rankings based on mean percentiles are provided for each fitness test, as well as an overall fitness ranking. Finally, an interactive fitness platform, including individual and group reporting and European fitness maps, is provided and freely available online (www.fitbackeurope.eu).

Conclusion: This study discusses the major implications of fitness assessment in youth from health, educational and sport perspectives, and how the FitBack reference values and interactive web-based platform contribute to it. Fitness testing can be conducted in school and/or sport settings, and the interpreted results be integrated in the healthcare systems across Europe.

Keywords: physical endurance; physical fitness.

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Conflict of interest statement

Competing interests: None declared.

Figures

Figure 1
Figure 1
Percentile curves for cardiorespiratory and muscular strength tests among European children and adolescents. Smoothed percentiles were calculated using the generalised additive model for location, scale and shape method, and weights were applied according to country population. Data sources are available online (https://www.fitbackeurope.eu/en-us/fitness-map/sources) and in online supplemental table 1.
Figure 2
Figure 2
European fitness maps for cardiorespiratory and muscular strength in children and adolescents. Sex-specific and age-specific percentile values were calculated using available country-level data and were averaged across sexes and ages to obtain the mean percentile for each country compared with the EU reference values. Smoothed percentiles were calculated using the generalised additive model for location, scale and shape method, and weights were applied according to country population. Separate European fitness maps for girls and boys for these tests (as well as those for the obesity markers of body mass index and waist circumference) are available online (www.fitbackeurope.eu/en-us/fitness-map). The website map is interactive so that detailed information for each country is shown with the mouseover function. Not all countries have representative data, and therefore, caution should be paid when interpreting country comparisons presented in this study and in the platform. Data sources are available online (www.fitbackeurope.eu/en-us/fitness-map/sources) and in online supplemental table 1. EU, European Union.
Figure 3
Figure 3
Country average ranking in muscular strength and CRF in European children and adolescents. CRF in European children and adolescents. The ranking for muscular strength was computed as the average of the country ranking position in HGS and SLJ tests, while ranking for CRF directly reflects the country ranking position in the 20mSRT. Grey shaded areas indicate countries ranked in the top 10 for either muscular strength, CRF or both. This figure was created based on the data presented in table 4. Four countries (Albania, Bulgaria, Luxembourg and The Netherlands) were not included since they had either missing muscular strength or CRF data. Not all countries have representative data and therefore caution should be paid when interpreting country comparisons presented in this study and in the platform. Data sources are available online (www.fitbackeurope.eu/en-us/fitness-map/sources) and in online supplemental table 1. 20mSRT, 20 m shuttle run test; CRF, cardiorespiratory fitness; HGS, handgrip strength; SLJ, standing long jump.

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