The test is comprised of 91 shuttles and can last up to approximately 29-minutes; however, it is very unlikely somebody will complete it. Scores can be presented in three ways: 1) total distance (metres), 2) level achieved, or 3) VO2 max. Total distance is much simpler to understand and calculate, whereas level achieved is more complex as the test begins at level 5 and then skips to level 9 at the beginning.
How to: Calculate Total Distance
This is the simplest, most common, and perhaps the most reliable method of reporting YYIR test performance.
To calculate total distance, the simplest method is to record the number of shuttles completed by the participant and then multiply that number by 40 (40 = 2 x 20m shuttles [the run from cone B to cone C = 20m, then run back from cone C to cone B = 20m]).
For example, if an athlete performs 30 shuttles, this number can then be multiplied by 40 to calculate their total distance (e.g. 30 x 40 = 1,200m).
How to: Calculate VO2 max
Though the YYIR2 has been shown to be a moderately reliable predictor of VO2 max (8, 9), it is advised to use the test for what it was originally developed for – identifying an individual’s ability to repeatedly perform high-intensity aerobic work, which has proven to be a more sensitive measure of changes in performance than VO2 max. Regardless, for those who wish to use this method, the equations for calculating V02max are below:
- YYIR1 test: VO2 max (mL * kg-1 * min-1) = IR1 distance (m) × 0.0084 + 36.4
- YYIR2 test: VO2 max (mL * kg-1 * min-1) = IR2 distance (m) × 0.0136 + 45.3