Table 1. Adaptive changes in cardiorespiratory fitness over the training period. Interval jumping Interval running Pre Post Pre Post V·O2max (ml·kg–1·min–1) 46.7 ± 2.9 49.2 ± 3.3 47.6 ± 2.5 50.4 ± 2.9  P-value   %?  ES  CV of mean %? 0.001 ‡ 5.3 0.8 44% 0.0001 ‡ 5.9 1.0 20% vV·O2max (km·h–1) 13.3 ± 0.8 14.1 ± 0.6 13.5 ± 0.9 14.5 ± 0.6  P-value   %?  ES  CV of mean %? 0.001 ‡ 6.0 1.1 68% 0.0001 ‡ 7.4 1.3 44% VT1 (%V·O2max) 70.6 ± 2.5 74.1 ± 3.4 70.5 ± 2.1 74.4 ± 2.0  P-value   %?  ES  CV of mean %? 0.005 ‡ 4.9 1.1 38% 0.002 ‡ 5.5 1.9 19% VT2 (%V·O2max) 83.2 ± 2.9 86.9 ± 3.2 84.0 ± 3.1 88.6 ± 3.3  P-value   %?  ES  CV of mean %? 0.002 ‡ 4.4 1.2 37% 0.001 ‡ 5.4 1.4 19% Q·max (l·min–1) 29.0 ± 1.6 30.5 ± 2.1 28.7 ± 1.9 30.4 ± 1.9  P-value   %?  ES  CV of mean %? 0.001 ‡ 5.1 0.8 42% 0.0001 ‡ 5.9 0.9 19 SVmax (ml·b–1) 149.2 ± 8.5 157.0 ± 11.3 154.8 ± 8.5 163.2 ± 8.9  P-value   %?  ES  CV of mean %? 0.006 ‡ 5.2 0.7 44% 0.0002 ‡ 5.4 0.9 18% Values are means ± SD; %Δ, within group changes from pre- to post-training; ES, effect size. V̇O2max, maximum oxygen uptake; vV̇O2max, velocity associated with V̇O2max; VT1, first ventilatory threshold; VT2, second ventilatory threshold; Q̇max, maximal cardiac output; SVmax, stroke volume. N = 12 for each group. ‡ Significantly greater than pre-training value (P < 0.05).