Tomkinson et al. (International 20mSRT)
About this reference
Tomkinson et al. systematically reviewed 177 studies containing one-minute-stage 20-metre shuttle-run data from 50 countries, yielding 1,142,026 performances from apparently healthy youth aged 9-17. The authors standardised Leger, Eurofit, and Queen's University of Belfast variants to the original Leger protocol, adjusted study means to the population distribution at the mean measurement year of 2000, generated pseudodata by Monte Carlo simulation, and fitted sex- and age-specific LMS centiles. Table 3 reports completed-lap centiles at P5, P10, P20, P30, P40, P50, P60, P70, P80, P90, and P95.
Known limitations
- P25 and P75 are not reported directly. This site averages P20/P30 and P70/P80 respectively, then rounds half values up to the nearest completed lap.
- The international distribution is population-weighted and does not represent any one country. Sampling methods, testing environments, participant motivation, and measurement quality varied across contributing studies.
- Testing spanned 1981-2014 and was standardised to a mean measurement year of 2000. Secular declines reported by the authors mean the curves may overestimate some current populations.
- Only one-minute-stage 20m protocols were included, and variant results were mathematically standardised to the original Leger protocol. A local PACER recording may still produce non-comparable lap counts.
- Small sex-by-age-by-country-by-year groups (n<40), special-interest groups, and youth with known disease or injury were excluded, which limits use for clinical or disability populations.
- The 20m shuttle run reflects more than aerobic capacity, including running economy, body composition, motivation, pacing, and environmental conditions.
- These are normative centiles, not FitnessGram Healthy Fitness Zone thresholds or diagnostic cut-offs.