Cardiorespiratory Fitness Assessment in Pediatric Populations

Cardiorespiratory fitness (CRF) in children and adolescents is a critical indicator of current and future health, reflecting the integrated function of the heart, lungs and skeletal muscles during sustained activity. Assessment typically involves laboratory measures of maximal oxygen uptake (VO2max) or field-based tests that estimate aerobic capacity under practical conditions. Common protocols include the multi-stage 20-metre shuttle run and the six-minute walk test, each offering distinct advantages in terms of precision, feasibility and safety. Establishing normative values and tracking secular trends across diverse populations have become priorities for public health, guiding interventions aimed at reducing obesity, improving metabolic profiles and fostering healthy behaviours from an early age.

Research from Nature Portfolio

Age- and sex-specific reference standards have been developed for a large cohort of school-aged children, combining grip strength, standing long jump, sit-ups, flexibility and shuttle run performance. Percentile curves derived through advanced statistical modelling illustrate steady improvements with age and highlight widening differences between boys and girls in tasks requiring muscular power and endurance. These benchmarks enable practitioners to compare individual performance against a national framework, supporting tailored physical education curricula and clinical assessments across varied settings.

Cardiorespiratory Fitness Assessment in Pediatric Populations publication trend

The graph below shows the total number of articles in cardiorespiratory fitness assessment in pediatric populations across all publications each year (not limited to Nature Index journals).

Technical terms

Cardiorespiratory fitness (CRF): The ability of the circulatory and respiratory systems to supply oxygen to working muscles during sustained physical effort.

Maximal oxygen uptake (VO2max): The maximum volume of oxygen that an individual can utilise per kilogram of body weight per minute during exhaustive exercise.

20-metre shuttle run test (SRT): A progressive, incremental field test where participants run back and forth over a 20-metre course in time with audio signals, used to estimate VO2max.

Six-minute walk test (6MWT): A measure of functional exercise capacity in which the distance walked over six minutes is recorded under standardised conditions.

References

1. Evaluating the feasibility and acceptability of a co-designed physical activity intervention for rural middle schoolers: a pilot study. BMC Public Health (2024).
2. Secular trends of cardiorespiratory fitness in children and adolescents over a 35-year period: Chronicle of a predicted foretold. Frontiers in Public Health (2023).
3. Physical Fitness Percentiles of German Children Aged 9–12 Years: Findings from a Longitudinal Study. PLOS ONE (2015).
4. VALIDADE DE TESTES DE CAMPO PARA ESTIMATIVA DA APTIDÃO CARDIORRESPIRATÓRIA EM CRIANÇAS E ADOLESCENTES: UMA REVISÃO SISTEMÁTICA. Revista Paulista de Pediatria (2017).
5. Physical fitness reference standards for Chinese children and adolescents. Scientific Reports (2021).