## 3 Results
### Characteristics of Included Studies  
The results of the methodological quality assessment are presented in Table 1. Inter-rater agreement for the methodological quality evaluation process was perfect (Kappa coefficient = 1.00). In summary, the 10 studies obtained a minimum score of 6, so all of them were finally considered. On the other hand, Table 2 shows the characteristics of the 10 studies (\(n\) = 308 participants, \(k\) = 24 groups) finally included in the analysis. All RT interventions were conducted on male-only samples. The initial RSR of participants was 1.3 kg kg\({}^{-1}\) (range 1.2-1.4 kg kg\({}^{-1}\)) for the lower limb, and 1.1 kg kg\({}^{-1}\) (range 0.9-1.5 kg kg\({}^{-1}\)) for the upper limb. All training programs included a single resistance exercise. Specifically, seven studies trained the back squat [31; 32; 34; 35; 37; 38; 40], two the bench press [36; 39], and one the push-up [33]. VL ranged from 5% to 50%, with 10% \begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline \multicolumn{1}{c}{**Study**} & \multicolumn{10}{c}{**Item**} \\ \cline{2-13}  & **1*** & **2** & **3** & **4** & **5** & **6** & **7** & **8** & **9** & **10** & **11** & **Total** \\ \hline [PERSON] et al. [32] & 0 & 1 & 0 & 1 & 0 & 0 & 0 & 1 & 1 & 1 & 1 & 6 \\ [PERSON] et al. [35] & 0 & 1 & 0 & 1 & 0 & 0 & 0 & 1 & 1 & 1 & 1 & 6 \\ [PERSON] et al. [36] & 0 & 1 & 0 & 1 & 0 & 0 & 0 & 1 & 1 & 1 & 1 & 6 \\ [PERSON] et al. [37] & 0 & 1 & 0 & 1 & 0 & 0 & 0 & 1 & 1 & 1 & 1 & 6 \\ [PERSON] et al. [38] & 0 & 1 & 0 & 1 & 0 & 0 & 0 & 1 & 1 & 1 & 1 & 6 \\ [PERSON] et al. [39] & 0 & 1 & 0 & 1 & 0 & 0 & 0 & 1 & 1 & 1 & 1 & 6 \\ [PERSON] et al. [34] & 1 & 1 & 0 & 1 & 0 & 0 & 0 & 1 & 1 & 1 & 1 & 6 \\ [PERSON] et al. [40] & 1 & 1 & 0 & 1 & 0 & 0 & 0 & 1 & 1 & 1 & 1 & 6 \\ [PERSON] et al. [31] & 0 & 1 & 0 & 1 & 0 & 0 & 0 & 1 & 1 & 1 & 1 & 6 \\ [PERSON] et al. [33] & 0 & 1 & 0 & 1 & 0 & 0 & 0 & 1 & 1 & 1 & 1 & 6 \\ \hline \hline \end{tabular}
* According to the PEDro guidelines, the item 1 was not considered to calculate the total score.  
\end{table} 
Table 1: Results of the PEDro scale showing the risk of bias in potential studies. Figure 1: Flowchart illustrating the different phases of the search and study selection. RT: resistance training; VL: velocity loss; n: number. and 30% being the most common VL thresholds (\(k=4\)). Except for one study using the body mass as resistance (no additional external load) [33], relative load ranged from 50% to 85% 1 RM. The average duration and frequency of the RT programs were 7.4 weeks (range 5-8 weeks) and 2.2 sessions/week (range 2-3 sessions/week), respectively. Changes in dynamic strength were evaluated using the 1 RM (\(n=10\)) [31; 32; 33; 34; 35; 36; 37; 38; 39; 40], and the changes in velocity against (i) absolute loads lifted faster than 1.00 m\(\cdot\)s\({}^{-1}\) (squat) and 0.80 m\(\cdot\)s\({}^{-1}\) (bench press) at pre-training (i.e., low loads, \(n=8\)) [31; 32; 34; 35; 36; 38; 39; 40], and (ii) absolute loads lifted slower than 1.00 m\(\cdot\)s\({}^{-1}\) (squat) and 0.80 m\(\cdot\)s\({}^{-1}\) (bench press) at pre-training (i.e., moderate/high loads, \(n=8\)) [31; 32; 34; 35; 36; 38; 39; 40]. Five studies performed a local endurance test [31; 32; 34; 35; 36; 37; 38; 39; 40]. Athletic performance was examined through the sprint and jump abilities in seven studies [31; 32; 34; 35; 37; 38; 40]. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Study**} & \multicolumn{2}{c}{**Sample**} & \multicolumn{4}{c}{**Resistance Training Program**} & \multicolumn{4}{c}{**Outcomes**} \\ \cline{2-10}  & \begin{tabular}{c} **Size** \\ **(Initial RSR)** \\ \end{tabular}  & \begin{tabular}{c} **VL Actually** \\ **Incurted (\%)** \\ \end{tabular}  & \begin{tabular}{c} **Total Volume** \\ **(reps)** \\ \end{tabular}  & \begin{tabular}{c} **Training** \\ **Velocity (m\(\cdot\)s\({}^{-1}\))** \\ \end{tabular}  & **Lead** & **Exercise** & \ \begin{tabular}{c} **Duration/** \\ **Frequency** \\ \end{tabular}