## 4 Discussion  
This study aimed to compare the effects of SBG and STG on various parameters, including the pressure pain threshold (PPT), respiratory function, and lower chest expansion (LCE), in individuals with UCS. \begin{table}
\begin{tabular}{c c c c c c} \hline  & & **SBG** & **STG** & **Time F (\(p\))** & **Group F(\(p\))** & **Time \(\times\) Group F (\(p\))** \\ \hline \multirow{3}{*}{PD} & Pre & 9.49 \(\pm\) 5.13 ** & 9.20 \(\pm\) 3.77 & & 65.427 & 0.107 & 0.528 \\ \cline{2-6}  & post & 12.39 \(\pm\) 5.39 & 11.63 \(\pm\) 3.98 & (0.000 *) & (0.745) & (0.473) \\ \cline{2-6}  & t(\(p\)) & \(-\)5.649 (0.000 *) & \(-\)5.886 (0.000 *) & & & \\ \hline \multirow{3}{*}{TM} & Pre & 8.55 \(\pm\) 3.60 & 8.24 \(\pm\) 3.65 & & & \\ \cline{2-6}  & Post & 11.52 \(\pm\) 4.38 & 10.65 \(\pm\) 3.31 & (0.000 *) & (0.648) & (0.338) \\ \cline{2-6}  & t(\(p\)) & \(-\)6.093 (0.000 *) & \(-\)8.122 (0.000 *) & & & \\ \hline \multirow{3}{*}{IN} & Pre & 9.57 \(\pm\) 4.01 & 8.92 \(\pm\) 3.15 & & & \\ \cline{2-6}  & Post & 11.60 \(\pm\) 4.87 & 11.05 \(\pm\) 3.68 & 54.415 & 0.193 & 0.029 \\ \cline{1-1} \cline{2-6}  & t(\(p\)) & \(-\)4.845 (0.000 *) & \(-\)5.645 (0.000 *) & & (0.663) & (0.867) \\ \hline \end{tabular}
\end{table} 
Table 1: Comparison of the muscle pressure pain threshold of the PD, TM, and IN in the two groups. \begin{table}
\begin{tabular}{c c c c c c} \hline  & & **SBG** & **STG** & **Time F (\(p\))** & **Group F(\(p\))** & **Time \(\times\) Group F (\(p\))** \\ \hline \multirow{3}{*}{FVC(L)} & Pre & 4.00 \(\pm\) 1.04 ** & 3.68 \(\pm\) 0.73 & & & \\ \cline{2-6}  & Post & 4.17 \(\pm\) 1.07 & 3.79 \(\pm\) 0.70 & 33.322 & 1.198 & 2.111 \\ \cline{2-6}  & t(\(p\)) & \(-\)4.933 (0.000 *) & \(-\)3.172 (0.006 *) & & (0.282) & (0.157) \\ \hline \multirow{3}{*}{FEV\({}_{1}\)(L)} & Pre & 3.22 \(\pm\) 0.89 & 3.01 \(\pm\) 0.54 & & & \\ \cline{2-6}  & Post & 3.55 \(\pm\) 0.84 & 3.21 \(\pm\) 0.50 & 48.651 & 1.207 & 2.800 \\ \cline{2-6}  & t(\(p\)) & \(-\)5.920 (0.000 *) & \(-\)3.881 (0.001 *) & & (0.281) & (0.105) \\ \hline \multirow{3}{*}{FEV\({}_{1}\)/FVC\%} & Pre & 80.52 \(\pm\) 8.58 & 82.43 \(\pm\) 8.46 & & & \\ \cline{2-6}  & Post & 85.71 \(\pm\) 6.97 & 85.45 \(\pm\) 7.07 & 13.726 & 0.107 & 0.955 \\ \cline{1-1} \cline{2-6}  & t(\(p\)) & \(-\)2.741 (0.015 *) & \(-\)2.623 (0.019 *) & & & \\ \hline \multirow{3}{*}{LCE} & Pre & 4.29 \(\pm\) 0.62 & 4.58 \(\pm\) 0.74 & & & \\ \cline{2-6}  & Post & 6.90 \(\pm\) 1.59 & 6.86 \(\pm\) 1.43 & 96.929 & 0.150 & 0.475 \\ \cline{1-1} \cline{2-6}  & t(\(p\)) & \(-\)6.247 (0.000 *) & \(-\)8.514 (0.000 *) & & (0.702) & (0.496) \\ \hline \end{tabular}
\end{table} 
Table 2: Comparison of respiratory function and lower chest expansion in the two groups. The PPT of the posterior deltoid, teres major, and infraspinatus muscles was significantly increased in both groups. The posterior deltoid muscle is known for its role in external rotation and horizontal abduction of the shoulder joint; the teres major muscle and infraspinatus muscle also perform the functions of external rotation and shoulder joint adduction. In subjects with UCS, when scapular tilt is excessive anteriorly or there is internal rotation, the posterior deltoid, teres major, and infraspinatus muscles are shortened [25]. Patients with posterior shoulder tightness are known to have a high sensitivity to stretching and low-pressure pain thresholds in the infraspinatus and posterior deltoid muscles [21]. Previous studies have shown an inhibitory effect of stretching on skin pain perception, while others have found that PPT increases both during and after stretching [30]. The internal rotation of the scapula in any position causes a visual increase in the tension of the spinal sheath ligament, and the opposing scapula in the retracted position increases the PPT of the infraspinatus and deltoid muscles [19]. [PERSON] et al. also found that after 40 min of strengthening exercise, the pain threshold of the teres major muscle increased [31].