The Effects of Muscle Strength Imbalance of Lower-Extremity on Countermovement Jump Performance and Dynamic Balance in Youth Soccer Players

2021 ◽  
Vol 23 (1) ◽  
pp. 107-118
Author(s):  
Hyo-Cheol Lee ◽  
Hee-Jeong Son
Keyword(s):  
Muscle Strength ◽  
Lower Extremity ◽  
Dynamic Balance ◽  
Soccer Players ◽  
Countermovement Jump ◽  
Jump Performance ◽  
Youth Soccer

scholarly journals Dynamic balance in male youth soccer players: the role of anthropometric and physical fitness factors

2021 ◽  
Keyword(s):  
Muscle Strength ◽  
Physical Fitness ◽  
Dynamic Balance ◽  
Soccer Players ◽  
Countermovement Jump ◽  
Fat Percentage ◽  
Core Strength ◽  
Back Muscle Strength ◽  
Youth Soccer ◽  
Forward Flexion

Background: The purpose of this study was to analyze the factors needed to improve the dynamic balance of youth soccer players. Methods: A total of 170 youth soccer players (84 U-15 and 86 U-18 players) participated in this study. Their anthropometric (height, weight, and body fat percentage) and physical fitness (dynamic balance, muscle strength, power, core strength, agility, reaction time, and flexibility) characteristics were evaluated. To investigate the effects of these factors on dynamic balance, a multiple regression analysis was conducted. Results: The results showed that the weight (P = 0.008) and back muscle strength (P = 0.039); and actions, such as sit-up (P = 0.017), countermovement jump (P = 0.019), and trunk forward flexion (P = 0.009) were significant factors affecting balance in all the soccer players of this study (R2 = 0.265). In the U-15 group, only the countermovement jump (P = 0.019) was found to significantly influence dynamic balance (R2 = 0.275). In contrast, in the U-18 group, weight (P = 0.002), sit-up action (P < 0.001), countermovement jump (P = 0.019), and trunk forward flexion (P = 0.011) were found to affect dynamic balance (R2 = 0.439). Conclusion: Our study suggests that muscle strength, power, flexibility, and core strength are needed to improve the dynamic balance of youth soccer players.

scholarly journals Vertical Versus Horizontal Resisted Sprint Training Applied to Young Soccer Players: Effects on Physical Performance

2020 ◽  
Vol 15 (5) ◽  
pp. 748-758
Author(s):  
Jorge Carlos-Vivas ◽  
Jorge Perez-Gomez ◽  
Ola Eriksrud ◽  
Tomás T. Freitas ◽  
Elena Marín-Cascales ◽  
...  
Keyword(s):  
Vertical Jump ◽  
Analysis Of Covariance ◽  
Soccer Players ◽  
Group Comparison ◽  
Sprint Training ◽  
Countermovement Jump ◽  
Jump Performance ◽  
Youth Soccer ◽  
Before And After ◽  
Training Modalities

Purpose: To analyze and compare the effects of 4 different resisted sprint training (RST) modalities on youth soccer players’ performance after 8 weeks of training. Methods: Forty-eight youth soccer players were first randomly assigned to 4 groups and only then completed 8 weeks of RST: horizontal resisted sprint, vertical resisted sprint (VRS), combined resisted sprint, and unresisted sprint. Performance in horizontal and vertical jumps, sprint, and change of direction (COD) ability were assessed 1 week before and after the training intervention. Magnitude-based inference analysis was performed for calculating within-group pre–post differences. In addition, an analysis of covariance test was performed for between-group comparison, using the pretest values as covariates. After that, the analysis of covariance P values and the effect statistic were transformed to magnitude-based inference. Results: Within-group outcomes showed that all resisted training modalities experienced improvements in sprint (small to moderate) and COD (small to large) performance. Moreover, all groups, except unresisted sprint, enhanced the horizontal jump performance. However, only VRS improved on vertical jump. Between-group comparison outcomes revealed that only VRS improved the sprint time compared with horizontal resisted sprint (moderate) and COD performance compared with all groups (moderate to large). In addition, VRS enhanced the countermovement jump performance (small to large) compared with the other groups. Conclusions: Independent of the orientation of the resistance applied, RST is an effective training method for improving sprinting and COD performance. Nevertheless, VRS may promote greater improvements on sprint and COD ability and have a positive additional effect on countermovement jump performance and the reduction of COD deficit.

scholarly journals Countermovement Jump Performance Is Not Affected During an In-Season Training Microcycle in Elite Youth Soccer Players

2015 ◽  
Vol 29 (3) ◽  
pp. 752-757 ◽  
Author(s):  
James J. Malone ◽  
Conall F. Murtagh ◽  
Ryland Morgans ◽  
Darren J. Burgess ◽  
James P. Morton ◽  
...  
Keyword(s):  
Soccer Players ◽  
Countermovement Jump ◽  
Jump Performance ◽  
Youth Soccer

scholarly journals Effects of Short-Term Plyometric Training on Agility, Jump and Repeated Sprint Performance in Female Soccer Players

2021 ◽  
Vol 18 (5) ◽  
pp. 2274
Author(s):  
Marcin Maciejczyk ◽  
Renata Błyszczuk ◽  
Aleksander Drwal ◽  
Beata Nowak ◽  
Marek Strzała
Keyword(s):  
Physical Performance ◽  
Sprint Performance ◽  
Soccer Players ◽  
Plyometric Training ◽  
Countermovement Jump ◽  
Short Term ◽  
Jump Performance ◽  
Squat Jump ◽  
Repeated Sprint ◽  
Before And After

The aim of the study was to determine the effects of short-term (4 weeks, twice a week: 8 sessions) plyometric training on agility, jump, and repeated sprint performance in female soccer players. The study comprised 17 females performing this sports discipline. The players were randomly divided into two groups: with plyometric training (PLY) and the control (CON). All players followed the same training program, but the PLY group also performed plyometric exercises. Tests used to evaluate physical performance were carried out immediately before and after PLY. After implementing the short PLY training, significant improvement in jump performance (squat jump: p = 0.04, ES = 0.48, countermovement jump: p = 0.009, ES = 0.42) and agility (p = 0.003, ES = 0.7) was noted in the PLY group. In the CON group, no significant (p > 0.05) changes in physical performance were observed. In contrast, PLY did not improve repeated sprint performance (p > 0.05) among female soccer players. In our research, it was shown that PLY can also be effective when performed for only 4 weeks instead of the 6–12 weeks typically applied.

scholarly journals Effects of Slackline Training on Acceleration, Agility, Jump Performance and Postural Control in Youth Soccer Players

2019 ◽  
Vol 67 (1) ◽  
pp. 235-245
Author(s):  
Javier Fernández-Rio ◽  
Luis Santos ◽  
Benjamín Fernández-García ◽  
Roberto Robles ◽  
Iván Casquero ◽  
...  
Keyword(s):  
Postural Control ◽  
Training Program ◽  
Perceived Exertion ◽  
Center Of Pressure ◽  
Training Session ◽  
Soccer Players ◽  
Control Group ◽  
Countermovement Jump ◽  
Jump Performance ◽  
Squat Jump

AbstractThe goal of this study was to assess the effects of a supervised slackline training program in a group of soccer players. Thirty-four male division I under-19 players (16.64 ± 0.81 years) agreed to participate in the study. They were randomly divided into an experimental group (EG) and a control group (CG). The first group (EG) followed a 6-week supervised slackline training program (3 sessions/week; 5-9 min/session), while the CG performed only regular soccer training. Several variables were assessed in all participants: acceleration (20-m sprint test), agility (90º turns test), jump performance (squat jump, countermovement jump), and postural control (Center of Pressure ( CoP) testing: length, area, speed, Xmean, Ymean, Xspeed, Yspeed, Xdeviation, Ydeviation). Ratings of perceived exertion and local muscle ratings of perceived exertions were also recorded after each slackline training session. At post-tests, there was a significant increase only in the EG in acceleration, agility, squat jump and countermovement jump performance, as well as several CoP variables: area in the bipedal support on a firm surface, and length, area and speed in the left leg on a firm surface. The program was rated as “somewhat hard” by the players, while quadriceps, gastrocnemius and tibialis anterior were the most exerted muscles while slacklining. In conclusion, slackline training can be an effective training tool for young, high-level soccer players.

Age and Gender Effects on Lower Extremity Kinematics of Youth Soccer Players in a Stop-Jump Task

2005 ◽  
Vol 33 (9) ◽  
pp. 1356-1364 ◽  
Author(s):  
Bing Yu ◽  
Scott B. McClure ◽  
James A. Onate ◽  
Kevin M. Guskiewicz ◽  
Donald T. Kirkendall ◽  
...  
Keyword(s):  
Gender Differences ◽  
Lower Extremity ◽  
Cruciate Ligament ◽  
Flexion Angle ◽  
Soccer Players ◽  
Motion Patterns ◽  
Youth Soccer ◽  
Anterior Cruciate Ligament Injuries ◽  
Anterior Cruciate ◽  
Hip Flexion

Background Gender differences in lower extremity motion patterns were previously identified as a possible risk factor for non-contact anterior cruciate ligament injuries in sports. Hypothesis Gender differences in lower extremity kinematics in the stop-jump task are functions of age for youth soccer players between 11 and 16 years of age. Study Design Descriptive laboratory study. Methods Three-dimensional videographic data were collected for 30 male and 30 female adolescent soccer players between 11 and 16 years of age performing a stop-jump task. The age effects on hip and knee joint angular motions were compared between genders using multiple regression analyses with dummy variables. Results Gender and age have significant interaction effects on standing height (P = .00), body mass (P = .00), knee flexion angle at initial foot contact with the ground (P = .00), maximum knee flexion angle (P = .00), knee valgus-varus angle (P = .00), knee valgus-varus motion (P = .00), and hip flexion angle at initial foot contact with the ground (P = .00). Conclusion Youth female recreational soccer players have decreased knee and hip flexion angles at initial ground contact and decreased knee and hip flexion motions during the landing of the stop-jump task compared to those of their male counterparts. These gender differences in knee and hip flexion motion patterns of youth recreational soccer players occur after 12 years of age and increase with age before 16 years. Clinical Relevance The results of this study provide significant information for research on the prevention of noncontact anterior cruciate ligament injuries.

Development of muscle strength in relation to training level and testosterone in young male soccer players

1999 ◽  
Vol 87 (3) ◽  
pp. 1141-1147 ◽  
Author(s):  
L. Hansen ◽  
J. Bangsbo ◽  
J. Twisk ◽  
K. Klausen
Keyword(s):  
Muscle Strength ◽  
Repeated Measures ◽  
Young Male ◽  
Serum Testosterone ◽  
Isometric Strength ◽  
Soccer Players ◽  
Abdominal Muscles ◽  
Training Level ◽  
Jump Performance ◽  
Factor I

Isometric and functional strength of ninety-eight 11-yr-old male soccer players at an elite (E) and nonelite (NE) level were determined (3–4 times) through a 2-yr period, and the changes were related to growth and maturation. The initial isometric strength for extension with dominant leg [1,502 ± 35 (E) vs. 1,309 ± 39 (NE) N], extension with nondominant leg (1,438 ± 37 vs. 1,267 ± 45 N), extension with both legs (2,113 ± 76 vs. 1,915 ± 72 N), back muscles (487 ± 11 vs. 414 ± 10 N), abdominal muscles (320 ± 9 vs. 294 ± 8 N), and handgrip (304 ± 10 vs. 259 ± 8 N) increased by 15–40% during the period. Broad jump increased ( P < 0.05) by 15 (E) and 10% (NE). The E players had higher ( P< 0.05) initial isometric strength and broad jump performance compared with NE players, and differences were maintained throughout the period (multiple ANOVA for repeated measures) also when adjustment was made for age, dimensions, testosterone, and insulin-like growth factor I (generalized estimating equations analyses). The development of strength for both E and NE players together was significantly ( P < 0.001) related to changes in serum testosterone concentrations. The present data indicate that testosterone is important for development of strength in young boys and that, independent of serum testosterone concentration, E players have developed greater muscle strength compared with NE players.

Relationships Between Strength, Sprint, and Jump Performance in Well-Trained Youth Soccer Players

2014 ◽  
Vol 28 (1) ◽  
pp. 173-177 ◽  
Author(s):  
Paul Comfort ◽  
Al Stewart ◽  
Laurence Bloom ◽  
Ben Clarkson
Keyword(s):  
Soccer Players ◽  
Jump Performance ◽  
Youth Soccer
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