Several studies have validated the 20-m multistage shuttle-run test (MSRT) in children by measuring the VO2peak value in the laboratory and relating this to the number of laps completed. PURPOSE: The aim of this study was to examine the validity of the FITNESSGRAM's MSRT software reports as a predictor of VO2peak in Lisbon healthy school children, by measuring the VO2peak during the actual 20-m shuttle run performance. METHODS: Ninety subjects, 45 boys and 45 girls aged 8-10 years, performed the MSRT and their VO2peak was determined in field using a portable gas analyzer (K4b2, Cosmed, Rome, Italy). Height and weight were measured with standard anthropometric methods, percentage of fat (%Fat) was estimated from skinfold thickness, and the number of completed laps during the shuttle run was recorded and estimated VO2peak values were derived via established FITNESSGRAM's equation. The determined peak VO2 value was considered the highest attained value during the last minute of the test. RESULTS: The mean determined VO2peak value of 49.6 ± 9.0 ml.kg-1.min-1 (53,3 ± 9.2 ml.kg-1.min-1 in boys and 45.9 ± 7.3 ml.kg-1.min-1 in girls) was compared to the mean estimated VO2peak value of 47.8 ± 2.7 ml.kg-1.min-1 (48.9 ± 2.7 ml.kg-1.min-1 in boys and 46.7 ± 2.2 ml.kg-1.min-1 in girls) and this difference was significant (P = 0.02). The r was 0.72 and 22.2% of the difference scores fell outside 9 ml.kg-1.min-1 of the measured VO2peak SD. The mean difference was higher in boys (4.4 ± 7.5 ml.kg-1.min-1, P<0.001) than in girls (-0.7 ± 6.2 ml.kg-1.min-1, P=0.445). CONCLUSION: These results suggest that the FITNESSGRAM's MSRT software reports underestimate the VO2peak values determined by the K4b2 in boys, but are suitable for girls.
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Castanheira et al. (2009) studied this question.