Table 4. Correlation coefficient matrix of the performance (i.e. distance covered in metres) in the YIET (Yo-Yo intermittent endurance Level 2 test) and in the MST (20 m multistage shuttle run test) with the measured maximal oxygen uptake (VO2max in ml·kg-1·min-1) in the same YIET and MST as well as in the TRT (treadmill run test), in soccer players (n = 8). YIET (ml·kg-1·min-1) MST (ml·kg-1·min-1) TRT (ml·kg-1·min-1) YIET (m) .67 .55 .48 MST (m) .74* .80 * .68 †  *p < 0.05; †  p = 0.06