# Comparison of Countermovement and Preferred-Style Jump Biomechanics in Male Basketball Players
## 3 Results
### Correlations between CMJ and Preff Parameters  
There were no significant correlations between the COM parameters of the CMJ and Preff (jump height: \(r=-0.036\), \(p=0.932\); peak GRF: \(r=0.489\), \(p=0.083\); ground contact time: \(r=0.276\), \(p=0.508\); velocity: \(r=0.006\), \(p=0.989\)). Similarly, there were very few  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & \multicolumn{3}{c}{**Pref**} & \multicolumn{1}{c}{**\(p\)-Value**} & \multicolumn{1}{c}{**Effect Size**} \\ \cline{3-6}  & **CMJ** & **Lead Leg** & **Trail Leg** & **Lead/Trail** & **Lead/Trail** \\ \hline \multicolumn{6}{c}{Peak flexion angle (\({}^{\circ}\))} \\ Hip & 93.1 \(\pm\) 8.8 & 67.6 \(\pm\) 20.8 & 84.7 \(\pm\) 8.8 & **0.003**/0.051 & 0.95/0.67 \\ Knee & 94.6 \(\pm\) 5.9 & 88.3 \(\pm\) 8.2 & 89.0 \(\pm\) 11.9 & **0.039**/0.218 & 0.62/0.44 \\ Ankle & 32.5 \(\pm\) 2.9 & 37.1 \(\pm\) 32.4 & 21.8 \(\pm\) 2.7 & 0.692/**0.001** & 0.15/1.31 \\ \hline \multicolumn{6}{c}{Peak extension velocity (\({}^{\circ}\)-\({}^{1}\))} \\ Hip & 625 \(\pm\) 105 & 581 \(\pm\) 147 & 504 \(\pm\) 60 & 0.608/**0.002** & 0.26/0.88 \\ Knee & 844 \(\pm\) 102 & 919 \(\pm\) 243 & 960 \(\pm\) 82 & 0.320/**0.002** & 0.31/0.82 \\ Ankle & 831 \(\pm\) 51 & 851 \(\pm\) 101 & 885 \(\pm\) 89 & 0.464/0.105 & 0.20/0.54 \\ \hline \multicolumn{6}{c}{Peak extension NJM (N\(\cdot\)m\(\cdot\)kg\({}^{-1}\))} \\ Hip & 2.42 \(\pm\) 0.24 & 2.96 \(\pm\) 0.59 & 4.30 \(\pm\) 0.79 & **0.035**/**0.001** & 0.78/1.26 \\ Knee & 2.09 \(\pm\) 0.24 & 2.83 \(\pm\) 0.30 & 3.76 \(\pm\) 0.46 & **0.001**/**0.001** & 1.20/1.35 \\ Ankle & 1.78 \(\pm\) 0.11 & 2.13 \(\pm\) 0.21 & 3.17 \(\pm\) 0.36 & **0.004**/**0.001** & 1.08/1.37 \\ \hline \multicolumn{6}{c}{Peak positive NJP (W\(\cdot\)kg\({}^{-1}\))} \\ Hip & 8.6 \(\pm\) 1.2 & 14.2 \(\pm\) 3.8 & 11.8 \(\pm\) 3.4 & **0.009**/**0.022** & 1.06/0.82 \\ Knee & 15.2 \(\pm\) 1.4 & 19.6 \(\pm\) 2.7 & 22.9 \(\pm\) 3.3 & **0.001**/**0.001** & 1.07/1.24 \\ Ankle & 11.2 \(\pm\) 1.0 & 12.8 \(\pm\) 1.9 & 18.2 \(\pm\) 2.8 & **0.004**/**0.001** & 0.71/1.27 \\ \hline \multicolumn{6}{c}{Positive NJW (J\(\cdot\)kg\({}^{-1}\))} \\ Hip & 1.36 \(\pm\) 0.17 & 2.25 \(\pm\) 0.87 & 1.93 \(\pm\) 0.48 & **0.024**/**0.010** & 0.88/0.94 \\ Knee & 1.77 \(\pm\) 0.15 & 2.13 \(\pm\) 0.47 & 1.78 \(\pm\) 0.17 & 0.041/0.859 & 0.71/0.05 \\ Ankle & 0.98 \(\pm\) 0.10 & 0.96 \(\pm\) 0.13 & 1.25 \(\pm\) 0.14 & 0.640/**0.001** & 0.10/1.11 \\ \hline \multicolumn{6}{c}{Negative work (J\(\cdot\)kg\({}^{-1}\))} \\ Hip & \(-1.13\pm\) 0.35 & \(-0.60\pm\) 0.35 & \(-1.49\pm\) 0.46 & **0.005**/0.184 & 0.92/0.63 \\ Knee & \(-0.94\pm\) 0.17 & \(-1.82\pm\) 0.61 & \(-2.18\pm\) 0.17 & **0.003**/**0.001** & 1.06/1.41 \\ Ankle & \(-0.25\pm\) 0.06 & \(-0.75\pm\) 0.41 & \(-0.64\pm\) 0.22 & **0.007**/**0.002** & 0.98/1.15 \\ \hline \end{tabular} Note: significant \(p\)-values are shown in **bold**. NJM—net joint moment; NJP—net joint power; NJW—net joint work.  
\end{table}
Table 2: Mean \(\pm\) SD joint-level biomechanical parameters during the countermovement (CMJ) and preferred-style (Pref) jumps.  
significant correlations between joint-level parameters of the CMJ and PrefJ (Table 3). The only significant and strong correlations between CMJ and PrefJ joint-level parameters were found to exist between ankle NJP and positive NJW of the lead leg (Table 3).