## 3 Results
### The Effect of LT on PAPE  
As shown in Table 3 and Figure 2a,b, under LT conditions, there was no interaction between jump height and resting time (\(F_{(6,66)}\) = 0.693, \(p\) = 0.537), indicating that jump height had no significant effect on the induction and maintenance of PAPE. VJ performance after 4 min (30 cm, ES, \(-\)0.19, 95% CI (0.06, 2.44), \(p\) = 0.001; 90 cm, ES, \(-\)0.25, 95% CI (0.25, 2.92), \(p\) = 0.004), 8 min (30 cm, ES, \(-\)0.24, 95% CI (\(-\)0.11, 3.28), \(p\) = 0.000; 90 cm, ES, \(-\)0.29, 95% CI (0.32, 3.52), \(p\) = 0.002), and 12 min (30 cm, ES, \(-\)0.23, 95% CI (\(-\)0.60, 3.76), \(p\) < 0.001; 90 cm, ES, \(-\)0.39, 95% CI (\(-\)0.08, 4.42), \(p\) < 0.001) of the 30 cm and 90 cm drop jumps were \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multicolumn{3}{c}{**Drop Jump**} & \multirow{2}{*}{**Pre (cm)**} & \multirow{2}{*}{**4 min (cm)**} & \multirow{2}{*}{**8 min (cm)**} & \multicolumn{3}{c}{**Effect Size (95\% Confidence Interval)**} \\  & & & & & & **4 min vs. Pre** & 8 min vs. Pre & 12 min vs. Pre \\ \hline \multirow{8}{*}{RT} & 30 cm & 302.50 \(\pm\) 5.97 & 302.83 \(\pm\) 5.34 & 302.58 \(\pm\) 5.60 & 302.00 \(\pm\) 5.39 & 0.06 & 0.01 & \(-\)0.09 \\  & & & & & & (\(-\)118.18) & (\(-\)101.151) & (\(-\)0.58, 2.25) \\  & 60 cm & 302.33 \(\pm\) 5.94 & 305.83 \(\pm\) 6.31 ** & 305.58 \(\pm\) 5.79 ** & 303.50 \(\pm\) 5.93 & 0.57 & 0.55 & 0.20 \\  & 90 cm & 302.67 \(\pm\) 6.08 & 305.17 \(\pm\) 7.51 ** & 305.92 \(\pm\) 7.54 ** & 303.92 \(\pm\) 7.13 & (\(-\)4.78, \(-\)2.20) & (\(-\)4.51, \(-\)1.99) & (\(-\)1.70, \(-\)0.63) \\  & 30 cm & 302.33 \(\pm\) 6.69 & 301.08 \(\pm\) 6.23 ** & 300.75 \(\pm\) 6.72 ** & 300.75 \(\pm\) 6.97 ** & (\(-\)4.10, \(-\)0.90) & (\(-\)5.75, \(-\)0.75) & (\(-\)2.73, 0.23) \\  & 60 cm & 302.33 \(\pm\) 6.54 & 302.17 \(\pm\) 6.00 ** & 300.75 \(\pm\) 6.72 ** & 300.75 \(\pm\) 6.97 ** & (\(-\)0.19, \(-\)0.24) & (\(-\)0.23 \\  & 90 cm & 302.67 \(\pm\) 6.23 & 301.08 \(\pm\) 6.52 ** & 301.08 \(\pm\) 6.52 ** & 300.75 \(\pm\) 7.07 ** & 300.42 \(\pm\) 5.33 ** & (\(-\)0.25, 2.92) & (\(-\)0.32, 3.52) & (\(-\)0.84, 4.42) \\ \hline \multirow{8}{*}{LT} & \multirow{8}{*}{60 cm} & \multirow{8}{*}{Note: RT, room temperature; LT, low temperature. Compared to pre-test, *} & \multirow{8}{*}{\(p\) < 0.05; ** \(p\) < 0.01.} & \multirow{8}{*}{\(p\) < 0.01.} & \multirow{8}{*}{\(p\) < 0.01.} \\  & & & & & & (\(-\)10, -0.90) & (\(-\)5.75, \(-\)0.75) & (\(-\)2.73, 0.23) \\ \cline{1-1}  & & & & & & (\(-\)0.19) & \(-\)0.24 & \(-\)0.23 \\ \cline{1-1}  & & & & & & (\(-\)0.26, 2.4) & (\(-\)0.11, 3.28) & (\(-\)0.60, 3.76) \\ \cline{1-1}  & & & & & & (\(-\)0.03) & \(-\)0.14 & \(-\)0.21 \\ \cline{1-1}  & & & & & & (\(-\)10, 13.4) & (\(-\)0.23, 2.07) & (\(-\)0.14, 2.97) \\ \cline{1-1}  & & & & & & & (\(-\)0.25) & \(-\)0.29 & \(-\)0.39 \\ \cline{1-1}  & & & & & & (\(-\)0.25, 2.92) & (\(-\)0.32, 3.52) & (\(-\)0.08, 4.42) \\ \hline \hline \end{tabular} Note: RT, room temperature; LT, low temperature. Compared to pre-test, * \(p\) < 0.05; ** \(p\) < 0.01. Compared to RT, * \(p\) < 0.05; ** \(p\) < 0.01.  
\end{table} 
Table 3: Comparisons of vertical jump heights over the distinct resting times after drop jump training at different ambient temperatures. Figure 2: **(a,b)** Vertical jump height at the baseline and after completing drop jump training at different ambient temperatures: **(a)** room temperature; **(b)** low temperature. Compared with pre-test, * \(p\) < 0.05, ** \(p\) < 0.01; # \(p\) < 0.01; & \(k\) \(p\) < 0.05.  
significantly lower than the pre-test, indicating that the 30 cm and 90 cm drop jumps failed to induce PAPE, and the performance gradually decline over time.