## 3 Results
### 3.2 Shear Modulus and Mechanical Parameters
#### 3.2.4 BFlh  
Concerning the comparison involving BFlh previously injured limbs vs. the contralateral limb (Table 4), in the active shear modulus, the BFsh (pre: 49.44 \(\pm\) 12.34 kPa; post: 55.19 \(\pm\) 15.60 kPa; \(p=0.034;\)\(\eta^{2}_{\rm P}=0.348\)) showed a significant difference between instants, while the ST demonstrated an injury and instant interaction (\(p=0.036;\)\(\eta^{2}_{\rm P}=0.318\)). Finally, for neuromuscular parameters, a statistical difference was observed between instants for PT (pre: 138.5 \(\pm\) 41.4 Nm; post: 130.8 \(\pm\) 36.5 Nm; \(p=0.010;\)\(\eta^{2}_{\rm P}=0.415\)) and TU-RTDmax (pre: 0.083 \(\pm\) 0.022 s; post: 0.072 \(\pm\) 0.019 s; \(p=0.004;\)\(\eta^{2}_{\rm P}=0.477\)). RTD 0-50 ms also presented a significant difference between limbs with BFlh injury history and their contralateral with no injury history (previously injured: 496.93 \(\pm\) 234.3 Nm/s; contralateral: 422.7 \(\pm\) 208.3 Nm/s; \(p=0.005;\)\(\eta^{2}_{\rm P}=0.465\)).  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline  & & \multicolumn{2}{c}{**Pre Sprint**} & \multicolumn{2}{c}{**Post Sprint**} & \multicolumn{2}{c}{**Instant**} & \multicolumn{2}{c}{**Injury**} & \multicolumn{2}{c}{**Injury \(\times\) Instant**} \\  & & & & & & & & & & & \\ \hline \multirow{4}{*}{**Active** (\(\rm{kPa}\))} & BFlh & 29.41 \(\pm\) 9.92 & 29.65 \(\pm\) 12.65 & 28.79 \(\pm\) 11.11 & 31.80 \(\pm\) 14.31 & 0.646 & 0.008 & 0.706 & 0.006 & 0.409 & 0.026 \\  & BFsh & 47.79 \(\pm\) 10.03 & 53.71 \(\pm\) 18.81 & 57.32 \(\pm\) 16.90 & 54.91 \(\pm\) 19.47 & 0.085 & 0.118 & 0.766 & 0.004 & 0.177 & 0.075 \\  & SM & 33.70 \(\pm\) 9.52 & 35.01 \(\pm\) 7.26 & 33.83 \(\pm\) 9.17 & 37.63 \(\pm\) 10.91 & 0.259 & 0.053 & 0.461 & 0.023 & 0.310 & 0.043 \\  & ST & 61.69 \(\pm\) 18.18 & 56.52 \(\pm\) 19.57 & 61.01 \(\pm\) 17.21 & 54.73 \(\pm\) 14.03 & 0.512 & 0.017 & 0.262 & 0.096 & 0.768 & 0.003 \\  & BEH/ST & 0.50 \(\pm\) 0.18 & 0.59 \(\pm\) 0.33 & 0.48 \(\pm\) 0.16 & 0.59 \(\pm\) 0.26 & 0.817 & 0.002 & 0.223 & 0.056 & 0.870 & 0.001 \\ \hline \multirow{2}{*}{**Ratio**} & **Fock Torque (N-m)** & 139.35 \(\pm\) 44.69 & 132.46 \(\pm\) 23.29 & 131.31 \(\pm\) 28.15 & 118.19 \(\pm\) 29.21 & -0.001 & 0.447 & 0.434 & 0.024 & 0.230 & 0.055 \\  & RTD 0-50 (N-m/s) & 480.64 \(\pm\) 235.17 & 496.54 \(\pm\) 164.22 & 513.21 \(\pm\) 28.15 & 449.06 \(\pm\) 161.89 & 0.727 & 0.005 & 0.747 & 0.004 & 0.069 & 0.121 \\  & RTD 50-100 (N-m/s) & 770.31 \(\pm\) 268.89 & 823.65 \(\pm\) 192.56 & 745.66 \(\pm\) 245.47 & 715.54 \(\pm\) 174.65 & 0.020 & 0.306 & 0.889 & 0.001 & 0.043 & 0.148 \\  & RTD 150-200 (N-m/s) & 358.05 \(\pm\) 150.80 & 304.66 \(\pm\) 130.72 & 319.07 \(\pm\) 103.13 & 286.72 \(\pm\) 101.33 & 0.191 & 0.931 & 0.031 & 0.036 & 0.556 & 0.014 \\  & TU-RTDmax (s) & 0.078 \(\pm\) 0.022 & 0.073 \(\pm\) 0.015 & 0.072 \(\pm\) 0.021 & 0.070 \(\pm\) 0.013 & 0.088 & 0.122 & 0.503 & 0.017 & 0.503 & 0.017 \\ \hline \hline \end{tabular} Abbreviations: BFlh, biceps femoris long head; BFsh, biceps femoris short head; SM, semimembranosus; contralateral limbs without injury history (n = 34) on active shear modulus and neuromuscular parameters values.  
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline  & & \multicolumn{2}{c}{**Pre Sprint**} & \multicolumn{2}{c}{**Post Sprint**} & \multicolumn{2}{c}{**Instant**} & \multicolumn{2}{c}{**Injury**} & \multicolumn{2}{c}{**Injury \(\times\) Instant**} \\  & & & & & & & & (**Pre vs. Post**) & **(Injured vs. Pair)** & **Injure** \\ \hline \multirow{4}{*}{**Active** (\(\rm{kPa}\))} & BFlh & 30.22 \(\pm\) 10.32 & 29.80 \(\pm\) 11.88 & 30.84 \(\pm\) 12.91 & 29.56 \(\pm\) 12.63 & 0.891 & 0.001 & 0.618 & 0.008 & 0.636 & 0.007 \\  & BFsh & 48.57 \(\pm\) 16.57 & 50.64 \(\pm\) 16.54 & 54.25 \(\pm\) 15.51 & 49.90 \(\pm\) 15.58 & 0.169 & 0.060 & 0.672 & 0.006 & 0.009 & 0.089 \\  & SM & 34.82 \(\pm\) 9.48 & 35.62 \(\pm\) 11.63 & 35.06 \(\pm\) 9.38 &