# Characteristics of Changes in Contractile Properties of Muscle after Anaerobic Exercise
## 3 Results
Two statistically significant correlations were found for the gluteus maximus muscle--a positive one between the d Ts parameter and the AC parameter (\(0.53\)) and a negative one between the d Td parameter and the AP parameter (\(-0.55\)). The soleus muscle showed a positive relationship between the d Tc parameter in comparison with tPPO (\(0.49\)), and a negative relationship between the d Ts parameter and FI (\(-0.58\)). The correlation with the PP parameter was obtained only in the vastus lateralis muscle in connection with d Td, where this relationship was negative. In the case of the vastus medialis muscle, two negative correlations were found for the d Tc parameter in comparison with AP (\(-0.58\)) and AC (\(-0.54\)). \begin{table}
\begin{tabular}{l c c c c c c c c} \hline \hline
**Muscle** & **Parameter** & **Vmax** & **PPO** & **tPPO** & **AP** & **AC** & **FI** \\ \hline GL & d & Tc & \(-0.30\) & \(0.05\) & \(-0.09\) & \(-0.30\) & \(-0.32\) & \(0.04\) \\  & & Ts & \(-0.45\) & \(-0.42\) & \(0.22\) & \(-0.32\) & \(-0.20\) & \(-0.19\) \\  & & Tr & \(0.27\) & \(0.32\) & \(0.10\) & \(0.48\) & \(0.36\) & \(0.35\) \\  & & Dm & \(-0.40\) & \(-0.10\) & \(-0.15\) & \(-0.29\) & \(-0.20\) & \(-0.13\) \\  & & Td & \(-0.16\) & \(0.07\) & \(-0.19\) & \(-0.24\) & \(-0.25\) & \(0.01\) \\ \hline GM & d & Tc & \(-0.63\) * & \(-0.41\) & \(-0.23\) & \(-0.55\) * & \(-0.60\) * & \(-0.40\) \\  & & Ts & \(-0.03\) & \(0.12\) & \(0.03\) & \(-0.13\) & \(-0.03\) & \(-0.18\) \\  & & Tr & \(-0.53\) * & \(-0.16\) & \(-0.11\) & \(-0.77\) * & \(-0.65\) * & \(-0.32\) \\  & & Dm & \(-0.49\) * & \(-0.08\) & \(-0.58\) * & \(-0.40\) & \(-0.36\) & \(-0.08\) \\  & & Td & \(0.02\) & \(-0.14\) & \(0.40\) & \(-0.11\) & \(-0.07\) & \(-0.18\) \\ \hline GT & d & Tc & \(-0.05\) & \(-0.26\) & \(-0.07\) & \(-0.06\) & \(-0.12\) & \(-0.23\) \\  & & Ts & \(0.40\) & \(-0.03\) & \(0.29\) & \(0.36\) & \(0.53\) * & \(-0.19\) \\  & & Tr & \(0.19\) & \(-0.09\) & \(0.20\) & \(0.18\) & \(0.35\) & \(-0.17\) \\  & & Dm & \(0.07\) & \(0.14\) & \(0.18\) & \(0.30\) & \(0.34\) & \(0.16\) \\  & & Td & \(-0.43\) & \(-0.36\) & \(0.26\) & \(-0.55\) * & \(-0.46\) & \(-0.36\) \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Matrix of correlation coefficients between changes in tensiomyography (TMG) parameters and selected parameters of the 30 s Wingate test (N = 20). \begin{table}
\begin{tabular}{l c c c c c c c c} \hline \hline  & & \multicolumn{3}{c}{**Before**} & \multicolumn{3}{c}{**After**} & \\ \hline
**Muscle** & **Parameter** & \(\mathbf{x}\) & **SD** & \(\mathbf{x}\) & **SD** & \(\mathbf{d}\) & \(\mathbf{p}\) & \(\mathbf{r}\) \\ \hline VM & Tc (ms) & 23.48 & 4.70 & 23.54 & 2.90 & 0.06 & 0.3703 & 0.20 \\  & Ts (ms) & 152.10 & 32.78 & 150.52 & 25.62 & \(-1.57\) & 0.8228 & 0.05 \\  & Tr (ms) & 74.44 & 53.48 & 87.92 & 47.20 & 13.48 & 0.5503 & 0.13 \\  & Dm (mm) & 7.64 & 2.33 & 8.06 & 1.57 & 0.43 & 0.5755 & 0.13 \\  & Td (ms) & 20.65 & 1.43 & 21.86 & 1.20 & 1.21 & * 0.0031 & 0.66 \\  & I (mA) & 66.66 & 12.66 & 67.25 & 11.65 & 0.59 & 0.7938 & 0.06 \\ \hline \hline \end{tabular} \(\bar{x}\)—mean; SD—standard deviation; d—index of difference; \(p\)—statistical probability; r—the effect size; GT—gluteus maximus; VM—vastus medialis; VL—vastus lateralis; RF—retents; SO—soleurs; GM— gastrocnemius medialis; GL—gastroremium lateralis; Tc—contraction time; Ts—sustain time; Tr—relaxation time; Dm—maximum radial muscle belly displacement; Td—delay time; I—intensity; \(\star\)—statistical significance.  
\end{table} 
Table 3: _Cont._In addition, a correlation analysis was conducted between BMI and changes in TMG parameters of individual muscle groups. The analysis showed that statistically significant correlations were observed only for d Dm (r = 0.551) and for d Td (r = 0.567) of the vastus lateralis muscle. Both correlations were positive, and their strength was at a moderate level.