Bilateral and unilateral vertical ground reaction forces and leg asymmetries in soccer players

Abstract

The purposes of this study were to assess unilateral and bilateral vertical jump performance characteristics, and to compare the vertical ground reaction force characteristics of the impulse and landing phase of a vertical jump between the dominant and non-dominant leg in soccer players. The sample consisted of 20 male soccer players (22.80 ± 2.71 years, 1.88 ± 0.06 m, 76.47 ± 8.80 kg) who competed in the third division of the Spanish football league. Vertical jump performance was determined by testing the impulse and landing phase of a bilateral vertical jump, dominant leg vertical jump and non-dominant leg vertical jump. Significant differences (p < 0.05) between dominant and non-dominant legs were found in counter movement jump (CMJ) flight time (LA = -2.38%, d = 0.33), CMJ flight height (LA = -4.55%, d = 0.33) and CMJ speed take-off (LA = -2.91%, d = 0.42). No significant differences were found between the dominant and non-dominant leg in the F1 and F2 magnitudes during the landing phase, the time from the first contact of the foot with the ground to the production of F1, the time from the second contact of the foot with the ground to the production of F2, and the time to stabilization of the landing phase. Although differences were found between the dominant and non-dominant leg in the impulse phase of the jump, no significant differences were found between dominant and non-dominant legs in the landing phase of vertical jump variables.

The effect of fatigue on phase specific countermovement jump asymmetries in ACL-R and non-injured rugby union players

“…The magnitude of difference between groups for each jump variable was analyzed using Cohen's d effect sizes. These values have been interpreted in line with a previous study where a small effect size is defined as (<0.2‐0.6), moderate (0.6‐1.2), large (1.2‐2), and very large (2‐4) . A one way ANOVA was used to assess differences in GPS variables and RPE between ACL‐R and non‐injured groups.…”

The effect of aquatic and land plyometric training on the vertical jump and delayed onset muscle soreness in brazilian soccer players

“…The peak responses of the reaction force against the land observed in several studies [2,13,14,16,35] indicated a reduction in DOMS responses and some muscle injury markers in the groups of jumps performed in water when compared with those performed directly on the land. The present study did not evaluate the peak of the reaction force against the land.…”

“…This depth seemed to be sufficient, since it presented a significant reduction (p < 0.05) in the DOMS reports when compared with the LPT group. It suggests a decrease in the impact on the APT group, since the high vertical GRFs have been identified as the main causes of soccer injury, owing to the stress that they exert on the musculoskeletal system [2].…”

“…During a soccer game, the prevalence of sprints, jumps, tackles, and dual plays is high [2]. The neuromuscular performance [3], the anaerobic metabolism, and, specifically, the anaerobic power of the lower extremities have been pointed out as crucial factors for the match outcome [4].…”

Comparing of Technical Skills of Young Football Players According to Preferred Foot

“…[23] found similar relationship between the right and left legs of players' body balance stabilization. Yanci and Camara [24] were to assess unilateral and bilateral vertical jump performance characteristics between the dominant and non-dominant leg in male soccer players (22.80 +/-2.71 years) at their study. In results of the study although differences were found between the dominant and non-dominant leg in the impulse phase of the jump, no significant differences were found between dominant and non-dominant legs in the landing phase of vertical jump variables.…”