Table 4. Analysis of variance (ANOVA) of the variables in the stress test. Comparisons between groups BE control Tennis control ER/ Tennis Variables Dif.(n=25) Dif.(n=27) Dif.(n=27) Initial HRmax –.12 –5.08 4.96 Final HRmax 10.26 4.51 5.74 Initial METS –.15 –.01 –.15 Final METS 1.09 1.19 * –.10 Initial exercise T` –.21 .03 –.24 Final exercise T` 1.42 1.52 * –.10 Initial HRrest 1.34 –3.32 4.67 Final HRrest –1.42 –6.90 5.48 HRmax: maximum heart rate achieved in the stress test; METS: metabolic equivalents; T`Test: test duration in minutes; HR rest: cardiac frequency before the start the test. * p < 0.05; ** p < 0.01; *** p < 0.001