Table 1. The test-retest reliability of the combined test procedure for the estimation of anaerobic threshold (AT) and maximal aerobic power (VO max). Results from test 1 (t1) and test 2 (t2) are reported from the 20 recreationally active subjects. These parameters were used to pre-define acceptable protocol limits of (error) agreement for the subsequent soccer observations. Results are expressed as mean (±SD). VO2AT (t1)ml×kg-1×min-1 VO2AT (t2)ml×kg-1×min-1 VO2max (t1)ml×kg-1×min-1 VO2max (t2)ml×kg-1×min-1 CV % CV % 34.1 (5.3) 33.9 (4.8) 49.5 (6.2) 49.7 (5.7) 4.6 3.4 VOAT = oxygen uptake at anaerobic threshold. VOmax = maximal aerobic power. CV = Coefficient of variance.