## 3 Results  
All measurements were expressed as relative change rates, with the baseline at 0 min set to 1. Overall, SBP showed no significant differences at 30 (1.003 \(\pm\) 0.037) or 60 min (1.009 \(\pm\) 0.030) following the intake of 100 mg of caffeine (\(p\) > 0.05). However, following a 200 mg intake, SBP significantly increased at 30 (1.014 \(\pm\) 0.029) and 60 min (1.029 \(\pm\) 0.044) (\(p\) < 0.05) (Table 2). DBP showed no significant differences at 30 (1.002 \(\pm\) 0.048) or 60 min (0.997 \(\pm\) 0.046) following 100 mg of caffeine intake (\(p\) > 0.05), whereas for the 200 mg intake, significant increases were observed from 0 to 30 min and 0 to 60 min (\(p\) = 0.004 and \(p\) = 0.006, respectively); however, no significant differences were noted between 30 and 60 min (\(p\) = 0.820) (Table 2 and Figure 2). \begin{table}
\begin{tabular}{l l l l l l l l l l} \hline \hline \multirow{2}{*}{**Variation**} & \multirow{2}{*}{**Caffeine**} & \multirow{2}{*}{**Time**} & \multirow{2}{*}{**Mean \(\pm\) SD**} & \multirow{2}{*}{**F**} & \multirow{2}{*}{**Factor 1**} & \multirow{2}{*}{**Factor 2**} & \multirow{2}{*}{**Mean Difference \(\pm\) SE**} & \multirow{2}{*}{**t**} & \multirow{2}{*}{\(P\)**Takey**} \\  & & & & & & & & & \(0.00301\) \(\pm\) 0.00669 & \(-\)0.450 & 0.895 \\ \hline \multirow{8}{*}{SBP} & \multirow{2}{*}{100 mg} & \multirow{2}{*}{30 min} & \multirow{2}{*}{1.003 \(\pm\) 0.03666} & \multirow{2}{*}{1.4} & \multirow{2}{*}{0.254} & \multirow{2}{*}{0 min} & \multirow{2}{*}{60 min} & \multirow{2}{*}{\(-\)0.00921 \(\pm\) 0.00552} & \multirow{2}{*}{\(-\)1.667} & \multirow{2}{*}{0.235} \\  & & 60 min & & & & & 30 min & 60 min & \(-\)0.00620 \(\pm\) 0.00436 & \(-\)1.420 & 0.344 \\ \cline{2-10} \cline{2-1 Significant differences were observed between 0 and 30 min (\(p\) = 0.016), but no significant differences were observed between 0 and 60 or 30 and 60 min (\(p\) = 0.504 and \(p\) = 0.138, respectively) following 100 mg of caffeine intake. For the 200 mg intake, no significant differences were observed at 30 min (1.001 \(\pm\) 0.028) or 60 min (0.999 \(\pm\) 0.030) (\(p\) > 0.05) (Table 3). MinD showed significant differences from 0 to 30 min and 0 to 60 min (\(p\) = 0.031 and \(p\) = 0.048, respectively), but no significant differences were found between 30 and 60 min (\(p\) = 0.610) after 100 mg of caffeine intake. For the 200 mg intake, no significant differences were observed from 30 min (0.999 \(\pm\) 0.036) and 60 min (0.996 \(\pm\) 0.030) (\(p\) > 0.05) (Table 3 and Figure 3). The PWV showed no significant differences at 30 (1.005 \(\pm\) 0.136) or 60 min (\(1.053\pm 0.112\)) following 100 mg of caffeine intake (\(p\) > 0.05). For the 200 mg intake, no significant differences were observed at 30 (1.014 \(\pm\) 0.162) or 60 min (1.001 \(\pm\) 0.128) (\(p\) > 0.05) (Table 4 and Figure 4). \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**Variation** & **Caffeine** & **Time** & **Mean \(\pm\) SD** & **F** & \(p\) & **Factor 1** & **Factor 2** & \begin{tabular}{c} **Mean Difference \(\pm\) SE** \\ **(Factor 1-Factor 2)** \\ \end{tabular}  & **t** & \(p\)**Tukey** \\ \hline \multirow{4}{*}{MaxD} & 0 min & 1 & & &  
The PSV showed significant differences between 0 and 30 min (\(p\) < 0.001); however, no significant differences were observed between 0 and 60 min and 30 and 60 min (\(p\) = 0.056 and \(p\) = 0.407, respectively) following 100 mg of caffeine intake. For the 200 mg intake, no significant differences were observed from 30 min (0.960 \(\pm\) 0.069) or 60 min (0.961 \(\pm\) 0.099) (\(p\) > 0.05) (Table 5 and Figure 5). HR showed significant differences between 0 and 60 min (\(p\) = 0.005) but no significant differences between 0 and 30 min and 30 and 60 min (\(p\) = 0.209 and \(p\) = 0.061, respectively) after 100 mg of caffeine intake. For the 200 mg intake group, significant differences were only observed from 0 to 60 min (\(p\) = 0.022), with insignificant changes observed between 0 and 30 and 30 and 60 min (\(p\) = 0.080, \(p\) = 0.235, respectively) (Table 5 and Figure 6).