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Background: The present study compared the effects of performing the lateral squat exercise in three different formats from eccentric overload training on concentric/eccentric peak/mean power and inter-limb asymmetries in young soccer players. Methods: Forty-five young male (U-17) soccer players were distributed into three groups. Two groups performed the same training volume with both legs, beginning with the weaker leg (SVW, n = 15) or with the stronger leg (SVS, n = 15). The third group executed double volume with the weaker leg and also commenced with such leg (DVW, n = 15) in the lateral squat during a 10-week period. Pre- and post-intervention metrics included concentric and eccentric peak/mean power during the lateral squat test and their corresponding asymmetries. Results: All groups improved all power variables. Concentric mean and peak power asymmetry were substantially reduced in the SVW (ES: 0.89), DVW (ES: 0.43), and in SVW (ES: 1.60). Eccentric mean and peak power asymmetry were also substantially decreased in SVW (ES: 0.81) and in DVW (ES: 0.68). Between-group analyses showed substantially better performance in concentric and eccentric variables with stronger and weaker legs in SVW and DVW groups compared with SVS. Conclusions: Those groups which started with the weaker leg showed greater both power enhancements and reductions on inter-limb asymmetries.
Alejandro Moreno-Azze; José Arjol-Serrano; David Falcón-Miguel; Chris Bishop; Oliver Gonzalo-Skok. Comparison of Three Eccentric Overload Training Strategies on Power Output and Interlimb Asymmetry in Youth Soccer Players. International Journal of Environmental Research and Public Health 2021, 18, 8270 .
AMA StyleAlejandro Moreno-Azze, José Arjol-Serrano, David Falcón-Miguel, Chris Bishop, Oliver Gonzalo-Skok. Comparison of Three Eccentric Overload Training Strategies on Power Output and Interlimb Asymmetry in Youth Soccer Players. International Journal of Environmental Research and Public Health. 2021; 18 (16):8270.
Chicago/Turabian StyleAlejandro Moreno-Azze; José Arjol-Serrano; David Falcón-Miguel; Chris Bishop; Oliver Gonzalo-Skok. 2021. "Comparison of Three Eccentric Overload Training Strategies on Power Output and Interlimb Asymmetry in Youth Soccer Players." International Journal of Environmental Research and Public Health 18, no. 16: 8270.
The association between asymmetries in jump and change of direction (COD) with physical performance in several sports show inconclusive results. The purposes of this study were to: (1) measure inter-limb asymmetries in three distinct groups in adolescent female soccer players and, (2) to determine the association between inter-limb asymmetries and physical performance in different age groups. Fifty-four players were distributed in three age groups: U-18, U-16 and U-14. All of them performed a series of jumps, sprints and change of direction speed tests. Asymmetries were assessed as the percentage difference between limbs, with the equation: 100/Max value (right and left) * in value (right and left) * −1 + 100. Mean inter-limb asymmetries were 2.91%, 4.82% and 11.6% for 180° COD, single leg hop and single leg countermovement jump tests respectively, but higher percentages of asymmetries were observed in many players individually. U-18 and U-16 showed significant differences on 180° left COD compared to U-14. Effect size (ES): 0.80 and 0.74, respectively; U-18 presented differences on single left leg hop test compared to U-14, ES: −0.72; U-16 also showed differences on 40 m speed compared to U-14, ES 0.87 (All p < 0.05). Jumping and COD physical tests show asymmetries in adolescent female soccer players, but these asymmetries do not interfere with physical performance. The largest asymmetry was observed in the single leg countermovement jump, and no asymmetries between groups were found. Due to the high variability in the direction of asymmetries, it is recommended to consider players’ individual asymmetries for designing specific training programs.
Elena Pardos-Mainer; Chris Bishop; Oliver Gonzalo-Skok; Hadi Nobari; Jorge Pérez-Gómez; Demetrio Lozano. Associations between Inter-Limb Asymmetries in Jump and Change of Direction Speed Tests and Physical Performance in Adolescent Female Soccer Players. International Journal of Environmental Research and Public Health 2021, 18, 3474 .
AMA StyleElena Pardos-Mainer, Chris Bishop, Oliver Gonzalo-Skok, Hadi Nobari, Jorge Pérez-Gómez, Demetrio Lozano. Associations between Inter-Limb Asymmetries in Jump and Change of Direction Speed Tests and Physical Performance in Adolescent Female Soccer Players. International Journal of Environmental Research and Public Health. 2021; 18 (7):3474.
Chicago/Turabian StyleElena Pardos-Mainer; Chris Bishop; Oliver Gonzalo-Skok; Hadi Nobari; Jorge Pérez-Gómez; Demetrio Lozano. 2021. "Associations between Inter-Limb Asymmetries in Jump and Change of Direction Speed Tests and Physical Performance in Adolescent Female Soccer Players." International Journal of Environmental Research and Public Health 18, no. 7: 3474.
The aim of this study was twofold: (i) to analyze the physical demands in the return to play (RTP) process of high-level soccer players in the role of floater in different soccer sided games (SGs) formats (i.e., 4vs4 + 2 and 8vs8 + 1); and (ii) to analyze the differences in physical demands encountered by regular and floater players among the SGs formats and official matches by means of global positioning system technology (GPS APEX pod, North Ireland) was used. Twenty-six highly trained, male soccer players (U16 years) participated in this investigation. Players were classified into two groups: 23 regular and 3 floater players, a total of eight SGs were analyzed, which involved the recording of 80 observations of regular and floater players. Match-play players showed most likely–probable differences in distance covered at high-intensity per minute (D > 14.4/min), at high-speed running per minute (D > 21/min), and peak velocity (Vpeak) in comparison to floaters in the 8vs8 + 1 LSG (large-side-games), and presented most likely differences in accelerations >2/min in comparison to match-play players. Therefore, the use of floaters during the last phase of the RTP (return to play) seems to be a useful strategy for progressive reintroduction into specific training (1) floater in the 4vs4 + 2 SSG; (2) floater in the 8vs8 + 1 LSG; (3) regular player in the 4vs4 + 2 SSG; and (4) regular player in the 8vs8 + 1 LSG before starting full trainings and returning to competition.
Demetrio Lozano; Miguel Lampre; Adrián Díez; Oliver Gonzalo-Skok; Diego Jaén-Carrillo; Daniel Castillo; José Luis Arjol. Global Positioning System Analysis of Physical Demands in Small and Large-Sided Games with Floaters and Official Matches in the Process of Return to Play in High Level Soccer Players. Sensors 2020, 20, 6605 .
AMA StyleDemetrio Lozano, Miguel Lampre, Adrián Díez, Oliver Gonzalo-Skok, Diego Jaén-Carrillo, Daniel Castillo, José Luis Arjol. Global Positioning System Analysis of Physical Demands in Small and Large-Sided Games with Floaters and Official Matches in the Process of Return to Play in High Level Soccer Players. Sensors. 2020; 20 (22):6605.
Chicago/Turabian StyleDemetrio Lozano; Miguel Lampre; Adrián Díez; Oliver Gonzalo-Skok; Diego Jaén-Carrillo; Daniel Castillo; José Luis Arjol. 2020. "Global Positioning System Analysis of Physical Demands in Small and Large-Sided Games with Floaters and Official Matches in the Process of Return to Play in High Level Soccer Players." Sensors 20, no. 22: 6605.
The aim of the study was to investigate the relationships between countermovement jump (CMJ) height and inertial power in squat and sprint variables with change of direction (COD) performance. Fifty young healthy active males participated in the study. To determine these relationships, we carried out a 10-m linear sprint test (T 10 m), vertical jump tests (CMJ and CMJ Abalakov), an assessment of power relative to bodyweight in a flywheel squat (Pbw), and 10-m COD sprints with two different turn types (COD-90° and COD-180°). T10 m showed statistically large and moderate correlations with T10 m COD-180° (r = 0.55) and T10-m COD-90° (r = 0.41), respectively. Moderate to large correlations between jumping height, linear sprinting, and sprints with COD were found (r = −0.43 to r = −0.59), and there were unclear correlations between jumping height and the loss of speed caused by executing COD (DEC-COD). Pbw showed a large correlation with CMJ Abalakov and CMJ jump height (r = 0.65 and r = 0.57, respectively), and a moderate and large correlation with T 10 m, T 10 m COD-180°, and T10 m COD-90° (r = −0.33, r = −0.38, and r = −0.54, respectively). Despite the existence of substantial correlations between variables, straight linear sprinting, jumping performance, CODs and squat power were, for the most part, separate motor qualities (R2 from 14% to 34%), suggesting that all of them should be specifically assessed and trained.
Luis Suarez-Arrones; Oliver Gonzalo-Skok; Irene Carrasquilla; Jose Asián-Clemente; Alfredo Santalla; Pilar Lara-Lopez; F. Javier Núñez. Relationships between Change of Direction, Sprint, Jump, and Squat Power Performance. Sports 2020, 8, 38 .
AMA StyleLuis Suarez-Arrones, Oliver Gonzalo-Skok, Irene Carrasquilla, Jose Asián-Clemente, Alfredo Santalla, Pilar Lara-Lopez, F. Javier Núñez. Relationships between Change of Direction, Sprint, Jump, and Squat Power Performance. Sports. 2020; 8 (3):38.
Chicago/Turabian StyleLuis Suarez-Arrones; Oliver Gonzalo-Skok; Irene Carrasquilla; Jose Asián-Clemente; Alfredo Santalla; Pilar Lara-Lopez; F. Javier Núñez. 2020. "Relationships between Change of Direction, Sprint, Jump, and Squat Power Performance." Sports 8, no. 3: 38.
To examining the relationship between hip adductor strength and groin injury incidence during the competitive season of professional football teams. Prospective Cohort study Controlled laboratory environment Seventy-one players volunteered to participate In the pre-season, maximal hip adductor strength was measured by means of the isometric adductor squeeze test. Hip adductor strength, normalized by body mass, was compared between players who suffered a groin injury (n=18) vs uninjured players (n=53). Risk ratios (RR) were used to evaluate the likelihood of players to suffer this type of injury. Most of the reported groin injuries occurred during competitive matches (5.5 per 1000 match hours). Maximal isometric hip adductor strength was lower in the groin-injured group compared with their uninjured counterparts (429.8 ± 100 vs 564 ± 58.7 N, d = -1.58 and 5.40 ± 1.27 vs 7.71 ± 0.89 N/kg, d = -1.88, respectively). Results revealed that values of maximal isometric adductor strength lower than 465.33 N increased the probability to suffer a groin injury by 72%. Furthermore, values of force relative to body mass lower than 6.971 N/kg increased the probability to suffer a groin injury by 83%. The assessment of Hip adductor strength, in addition to other measurements, might help practitioners to determine the probability of suffering an overuse groin injuries in elite football players.
V. Moreno-Pérez; B. Travassos; A. Calado; O. Gonzalo-Skok; J. Del Coso; A. Mendez-Villanueva. Adductor squeeze test and groin injuries in elite football players: A prospective study. Physical Therapy in Sport 2019, 37, 54 -59.
AMA StyleV. Moreno-Pérez, B. Travassos, A. Calado, O. Gonzalo-Skok, J. Del Coso, A. Mendez-Villanueva. Adductor squeeze test and groin injuries in elite football players: A prospective study. Physical Therapy in Sport. 2019; 37 ():54-59.
Chicago/Turabian StyleV. Moreno-Pérez; B. Travassos; A. Calado; O. Gonzalo-Skok; J. Del Coso; A. Mendez-Villanueva. 2019. "Adductor squeeze test and groin injuries in elite football players: A prospective study." Physical Therapy in Sport 37, no. : 54-59.