## 3 Results
### Nir\({}_{\text{TRS}}\) Data  
Table 1 displays the values of the NIR\({}_{\text{TRS}}\) indicators before and after 3 h of sitting with and without compression stockings. Figure 3 displays the rates of change in these values after 3 h of sitting with and without compression stockings. There was a significant decrease in the absorption coefficient of both limbs with and without compression stockings after the 3-hour sitting task (each \(p<0.05\)) (Table 1). However, the reduced \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & \multicolumn{2}{c}{**without Stocking**} & \multicolumn{2}{c}{**with Stocking**} \\ \cline{2-5}  & **Baseline** & **3 h** & **Baseline** & **3 h** \\ \hline \(\mu_{\text{a}}\) (cm\({}^{-1}\)) & \(0.24\pm 0.08\) & \(0.22\pm 0.07\) * & \(0.25\pm 0.08\) & \(0.24\pm 0.08\) * \\ \(\mu_{\text{s}}\)\({}^{\prime}\) (cm\({}^{-1}\)) & \(14.8\pm 6.5\) & \(15.4\pm 6.7\) * & \(17.7\pm 12.1\) & \(17.9\pm 12.1\) \\ Path Length (cm) & \(15.6\pm 2.9\) & \(16.5\pm 3.3\) * & \(15.1\pm 2.7\) & \(15.5\pm 2.6\) * \\ [oxy-Hb] (\(\mu\)M) & \(103.7\pm 37.4\) & \(91.1\pm 33.3\) * & \(108.1\pm 32.3\) & \(100.9\pm 35.2\) * \\ [deoxy-Hb] (\(\mu\)M) & \(48.4\pm 13.0\) & \(48.6\pm 12.0\) & \(45.6\pm 12.1\) & \(47.2\pm 11.2\) \\ [total-Hb] (\(\mu\)M) & \(152.1\pm 50.2\) & \(139.9\pm 44.4\) * & \(153.8\pm 43.8\) & \(148.1\pm 44.8\) * \\ \(\text{SO}_{2}\) (\%) & \(67.7\pm 2.4\) & \(64.4\pm 4.1\) * & \(70.2\pm 1.8\) & \(67.5\pm 3.6\) * \\ \hline \hline \end{tabular} *  
* \(p<0.05\) vs. Baseline.  
\end{table} 
Table 1: Near-infrared time-resolved spectroscopy parameters before and after 3-hour constant sitting with or without compression stocking. Figure 3: Percent changes in the near-infrared time-resolved spectroscopy parameters before and after 3-hour constant sitting with or without compression stocking; (**A**) oxy-Hb, (**B**) deoxy-Hb, (**C**) total Hb, (**D**) \(\text{SO}_{2}\). * \(p<0.05\) between groups. scattering coefficient showed a significant increase in limbs without the compression stocking, but it did not change in limbs with the compression stocking after the 3-hour sitting task (Table 1). The average optical path length increased significantly in both limbs (each \(p<0.05\)) (Table 1). The oxy-Hb levels decreased significantly in both limbs after the 3-hour sitting task (Table 1), and the rate of decrease was significantly greater in the limbs without compression stockings (limbs without compression stockings: \(-12.2\pm 5.6\%\); limbs with compression stockings: \(-7.7\pm 5.3\%\); \(p<0.05\)) (Figure 3A). Total Hb decreased significantly in both limbs after the 3-hour sitting task (Table 1), but the rate of decrease was lower in the limbs with compression stockings (limbs without compression stockings: \(-7.7\pm 4.9\%\); limbs with compression stockings: \(-4.0\pm 3.7\%\); \(p<0.05\)) (Figure 3C). The deoxy-Hb levels showed no significant changes before and after the 3-hour sitting task (Table 1, Figure 3B). In addition, although SO\({}_{2}\) decreased in both limbs after the 3-hour sitting task, there was no significant difference between the rates of decrease (Figure 3D). Relationship Between Lower Limb Circumference, Lower Limb Extracellular Water, and NIR\({}_{\text{TRS}}\) Indicators  
Figure 4 shows the relationship between the rate of change in lower limb extracellular water/total body water ratio and the rate of change in the lower limb circumference with and without compression stockings. There was a significant positive correlation between the rates of change in extracellular water and lower limb circumference before and after 3 h of constant sitting (r = 0.64; \(p<0.05\)), and we believe this was caused by an increase in extracellular water. Figure 5 shows the relationship between the rate of change in the extracellular water/total body water ratio of the lower limbs and the rate of change in each NIR\({}_{\text{TRS}}\) index in lower limbs with and without compression stockings due to 3-hour sitting task.