# Changes in Spinal-Reflex Excitability during Static Stretch and/or Explosive Contraction
## 3 Results
### Measurement Consistency  
Measurement consistency for each dependent variable at pre-condition was moderate to high (ICC values in spinal-reflex excitability: 0.85 to 0.99; H-reflex latency: 0.63 to 0.99; M-response latency: 0.77 to 0.99; and maximal countermovement vertical jump height: 0.93 to 0.97). All values including mean, standard deviation, and standard error of measurement (SEM) are presented in Table 4.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Condition** & **Measurements** & **Mean (SD)** & **ICC** & **SEM** \\ \hline \multirow{3}{*}{Stretch} & Spinal-reflex excitability & 0.24 (0.14) & 0.99 & 0.01 \\  & Peak H-reflex latency & 17.18 (2.03) & 0.99 & 0.20 \\  & Peak M-response latency & 6.29 (0.61) & 0.99 & 0.06 \\ \hline \multirow{3}{*}{Contraction} & Spinal-reflex excitability & 0.22 (0.10) & 0.97 & 0.02 \\  & Peak H-reflex latency & 17.57 (1.91) & 0.99 & 0.19 \\  & Peak M-response latency & 6.29 (0.61) & 0.99 & 0.06 \\  & Maximal vertical jump height & 48.4 (10.0) & 0.96 & 1.81 \\ \hline \multirow{3}{*}{Stretch and contraction} & Spinal-reflex excitability & 0.24 (0.12) & 0.99 & 0.01 \\  & Peak H-reflex latency & 17.36 (2.21) & 0.99 & 0.21 \\ \cline{1-1}  & Peak M-response latency & 6.07 (0.62) & 0.99 & 0.06 \\ \cline{1-1}  & Maximal vertical jump height & 50.1 (9.1) & 0.97 & 1.83 \\ \hline \multirow{3}{*}{Control} & Spinal-reflex excitability & 0.26 (0.14) & 0.99 & 0.02 \\ \cline{1-1}  & Peak H-reflex latency & 16.27 (2.10) & 0.99 & 0.20 \\ \cline{1-1}  & Peak M-response latency & 6.07 (0.62) & 0.99 & 0.06 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Mean (SD), ICC, and SEM of spinal-reflex excitability, H-reflex and M-response latency time, and two-legged countermovement maximal vertical jump height at the pre-condition values.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & \multicolumn{4}{c}{**Peak H-Reflex (ms)**} & \multicolumn{4}{c}{**Peak M-Response (ms)**} \\ \hline \multirow{3}{*}{Pre-condition} & **Stretch** & **Contraction** & **Stretch and** & **Control** & **Stretch** & **Contraction** & **Stretch and** & **Control** \\  & 17.2 & 17.6 & 17.4 & 16.3 & 6.3 & 6.3 & 6.1 & 6.1 \\  & (16.1 to 18.3) & (16.6 to 18.6) & (16.2 to 18.6) & (5.2 to 17.4) & (6.0 to 6.6) & (6.0 to 6.6) & (5.8 to 6.4) & (5.5 to 6.7) \\ Post-condition & 16.8 & 16.7 & 16.9 & 16.0 & 6.2 & 6.1 & 6.1 & 6.1 \\ at 0 min & (15.4 to 18.2) & (15.6 to 17.8) & (15.6 to 18.2) & (14.9 to 17.1) & (5.9 to 6.5) & (5.8 to 6.4) & (5.8 to 6.4) & (5.5 to 6.7) \\ Post-condition & 16.0 & 17.0 & 17.2 & 16.1 & 6.4 & 6.2 & 6.4 & 6.1 \\ at 20 min & (14.6 to 17.4) & (15.9 to 18.1) & (16.0 to 18.4) & (15.1 to 17.1) & (5.9 to 6.9) & (5.8 to 6.6) & (6.0 to 6.8) & (5.6 to 6.6) \\ \hline \end{tabular}  
The values are mean (lower and upper bounds of 95% confidence intervals).  
\end{table}
Table 2: Change in the latency time.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Unit: cm** & **Contraction** & **Stretch and Contraction** \\ \hline Condition & 48.4 (43.2 to 53.6) & 50.1 (45.3 to 54.9) \\ Post-condition at 0 min & 48.6 (43.4 to 53.8) & 50.0 (45.1 to 54.9) \\ Post-condition at 20 min & 49.0 (43.7 to 54.3) & 49.1 (44.1 to 54.1) \\ \hline \hline \end{tabular}  
The values are mean (lower and upper bounds of 95% confidence intervals). Note that the conditions with stretch and control did not perform maximal vertical jumps.  
\end{table}
Table 3: Change in two-legged countermovement maximal vertical jump height.