## 3 Results
### Outcomes Measures  
Dynamic stability related outcomes were assessed in seven studies [19; 21; 23; 25; 27; 28; 32]. As defined by [PERSON] et al. [11], the term \"dynamic stability\" was considered as the training of lower limb dynamic stabilization (with three categories of progression: Static balance, dynamic balance, and dynamic stabilization) and core dynamic stability. Further studies assessed coordination performing fundamental movements [19; 20; 26] and sport-specific skills [31], while other studies analyzed muscle strength [21; 23; 24; 27; 31] and glyometric [27; 32] tests. Agility [21; 23; 27] and speed [21; 24; 27; 31] tests were also considered by different studies. Finally, fatigue resistance [23; 24; 29] and injury risk [22; 29; 30; 32] were also examined. Among the selected studies, five [19; 21; 25; 28; 32] found significant improvements in dynamic stability. Four of them reported significant increments in Star excursion balance test (SEBT) in the intervention group compared with control participants [21; 25; 28; 32]. Furthermore, positive changes in single leg stability (one-leg hop test) were found [19]. Nevertheless, two studies [23; 27] did not report changes between-groups in this outcome. Significant changes compared to the control group were also observed in coordination performing fundamental movement skills (i.e., jumping and landing technique) in two studies [19; 20]. [PERSON] et al. [19] showed that the in-season training group had the greatest benefits on knee kinematics and single leg stability. Although, [PERSON] et al. [20] showed a greater peak knee flexion of landings in the neuromuscular training group in both bilateral (\(p=0.027\)) and unilateral landings (\(p=0.076\)). By contrast, non-significant between-group differences were observed by [PERSON] et al. [26]. With respect to the sport-specific skills, the only study that assessed this outcome [31] observed no differences between group performances of soccer players after a period of neuromuscular training. Among the five studies that assessed muscle strength, three reported significant improvements [21; 23; 24]. [PERSON] et al. [24] showed a 2% increment in countermovement jump (CMJ) in the experimental group. Moreover, [PERSON] et al. [21] found improvements in 1 RM leg press test, CMJ and maximal hopping test in the neuromuscular training group compared with the control group. This agrees with [PERSON] et al. [23] who reported significant changes in the training group (girls in physical education classes) in the curl up, long jump and single leg hop tests. Notwithstanding, two studies [27; 31] did not find any improvement in strength after the training protocol. Neither of the two studies which analyzed glyometric performance reported positive changes between training and control groups [27; 32]. Once the agility tests were analyzed, again contradictory results were found. Uniquely, the study performed by [PERSON] et al. [21] reported increments in shuttle run performance (\(d=0.52\)). However, non-significant improvements were seen on agility tests in two additional studies [23; 27]. This controversy persists in the speed tests results, while two studies found significant differences in 10-m sprint [21; 24] and one in 30-m sprint [21], the remaining two studies did not show changes in this outcome [27; 31]. With respect to the outcome of fatigue resistance, one study [23] conducted in girls, found positive changes. Moreover, a different study [24] observed significant changes in repeated sprint ability (RSA), with performance increments of \(\approx\)1.5%, but did not find changes in the 30-15 intermittent fitness test. Contrarily, [PERSON] et al. [29] showed that the experimental group, submitted to strength and dynamic stability training, had significant improvements in oxygen uptake (VO\({}_{\text{2 max}}\)) in the Leger 20-meter shuttle run test. With respect to the injury risk, three studies [22; 29; 32] found significant improvements in the training group compared to the control group. In their study, [PERSON] et al.