Figure 3. Adaptive responses of maximal oxygen uptake (V̇O2max), cardiac output (Q̇max), and stroke volume (SVmax) to high-intensity interval training using anaerobic speed reserve (HIITASR), HIIT using finial velocity during 30-15IFT test (HIITvIFT), and HIIT using maximal aerobic speed (HIITMAS). Triangles indicate individual percent change from baseline (X-axes) and horizontal bars represent mean group response. †  Denotes significantly different versus pre-training (p ≤ 0.05).