Estimating VOmax in children aged 5-6 years through the preschool-adapted 20-m shuttle-run test (PREFIT).

PURPOSE

(1) To examine the comparability, i.e., discriminatory power, in a preschooler test (PREFIT 20-m shuttle-run test) and the 20mSRT-Original in 5-6-year-olds; (2) to provide an equation to estimate VOmax from the 20mSRT-PREFIT.

METHODS

138 participants aged 5-6 years performed the 20mSRT-PREFIT and the 20mSRT-Original in a counterbalanced order. Total test duration, completed stages, maximum speed and maximum heart rate were registered.

RESULTS

Participants finished stages from 2-10 in the 20mSRT-PREFIT, whereas stages 1-5 were completed in the 20mSRT-Original and a null was registered, showing the original version a lower discriminatory power. We also observed that the higher the cardiorespiratory fitness level the more comparable were the tests, i.e., - 0.04 km h difference between tests in the fittest participants (i.e., maximum speed ≥ 9.5 km h). Using the original equation proposed by Leger and colleagues in 1988 and based on the estimation regression of maximum speed in the 20mSRT-Original from the PREFIT version, we computed a new equation to estimate VOmax from the 20mSRT-PREFIT: Y = 44.657 + 1.795X   - 2.601X  + 0.0852X X (r = 0.77; r  = 0.59; SEE = 1.25 ml kg min or 2.59% of estimated mean VOmax = 48.38 ml kg min), where X is the 20mSRT-PREFIT maximum speed (km h) and X is the age of participants. The 20mSRT-PREFIT resulted in a significantly higher maximum heart rate than the 20mSRT-Original.

CONCLUSIONS

The 20mSRT-PREFIT has higher discriminatory power than the 20mSRT-Original. Our study provides for the first time an opportunity to estimate VOmax in preschoolers and children based on the 20mSRT-PREFIT maximum speed and the age of participants.