Years of Training and Hamstring-Quadriceps Ratio of Soccer Players

2007 ◽  
Vol 101 (3) ◽  
pp. 899-906 ◽  
Author(s):  
V. Voutselas ◽  
Z. Papanikolaou ◽  
D. Soulas ◽  
K. Famisis
Keyword(s):  
Cardiorespiratory Fitness ◽  
Representative Sample ◽  
Normative Data ◽  
Soccer Players ◽  
Isokinetic Strength ◽  
Professional Soccer ◽  
Training Background

To investigate the effect of the years of training on the hamstring-quadriceps isokinetic strength and establish normative data for the cardiorespiratory fitness of first and second division Greek male professional soccer players ( M = 25.1, SD = 5.1 yr.) a representative sample of 72 soccer players was chosen randomly from six teams of these divisions. Hamstring-quadriceps ratios of the preferred and nonpreferred leg correlated with years of training weekly ( r = .51) in the preferred leg. In conclusion, data indicated that the training background of the players (years of training) might have a small effect on the strength balance of quadriceps and hamstrings of the preferred leg.

Isokinetic strength training program for muscular imbalances in professional soccer players

2008 ◽  
Vol 2 (3) ◽  
pp. 101-105 ◽  
Author(s):  
A. Gioftsidou ◽  
I. Ispirlidis ◽  
G. Pafis ◽  
P. Malliou ◽  
C. Bikos ◽  
...  
Keyword(s):  
Strength Training ◽  
Training Program ◽  
Soccer Players ◽  
Isokinetic Strength ◽  
Professional Soccer

scholarly journals Isokinetic Strength Responses to Season-long Training and Competition in Turkish Elite Soccer Players

2012 ◽  
Vol 31 (1) ◽  
pp. 159-168 ◽  
Author(s):  
Niyazi Eniseler ◽  
Çağatay Şahan ◽  
Hikmet Vurgun ◽  
Hasan Mavi
Keyword(s):  
Knee Extensor ◽  
Peak Torque ◽  
Soccer Players ◽  
Isokinetic Strength ◽  
Professional Soccer ◽  
Knee Strength ◽  
Flexor Muscles ◽  
Angular Velocities ◽  
Soccer Training ◽  
Knee Flexors

Isokinetic Strength Responses to Season-long Training and Competition in Turkish Elite Soccer PlayersThere are not enough studies that describe the isokinetic strength of professional soccer players at high angular velocities. The purpose of this study was to evaluate the seasonal changes in isokinetic strength of Turkish professional soccer players (n=14) over the course of a 24-week soccer season. The isokinetic strength of players who underwent usual soccer training and weekly competition throughout the soccer season was assessed by means of the Biodex System 3 dynamometer with the knee attachment. The peak torque of knee extensor and flexor muscles were measured at angular velocities of 60°/s, 300°/s and 500°/s. Players were tested at the beginning and end of the competitive season. While the first- and second-test measurements did not show significant changes at 60°/s and 300°/s angular velocities, at the end of the training period, players' knee strength changed significantly at 500°/s angular velocities. In addition, the H/Q ratio improved significantly for the dominant as well as non-dominant leg at 500°/s. Significant bilateral strength improvements for knee flexors were also observed at 500°/s. The findings of this study suggest that usual daily soccer training (technical, tactical, power, strength, endurance, flexibility, etc.) and weekly competition might produce changes in knee strength at high angular velocities.

The isokinetic strength profile of semi-professional soccer players according to low back pain

2020 ◽  
Vol 33 (3) ◽  
pp. 501-506
Author(s):  
Dejan Madić ◽  
Borislav Obradović ◽  
Dragana Golik-Perić ◽  
Dragan Marinković ◽  
Nebojša Trajković ◽  
...  
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Soccer Players ◽  
Isokinetic Strength ◽  
Low Back ◽  
Professional Soccer

Hamstring and Quadriceps Isokinetic Strength Deficits Are Weak Risk Factors for Hamstring Strain Injuries

2016 ◽  
Vol 44 (7) ◽  
pp. 1789-1795 ◽  
Author(s):  
Nicol van Dyk ◽  
Roald Bahr ◽  
Rodney Whiteley ◽  
Johannes L. Tol ◽  
Bhavesh D. Kumar ◽  
...  
Keyword(s):  
Risk Factors ◽  
Logistic Regression ◽  
Knee Flexion ◽  
Soccer Players ◽  
Strength Testing ◽  
Isokinetic Strength ◽  
Hamstring Strain ◽  
Professional Soccer ◽  
Absolute Strength ◽  
Flexion And Extension

Background: A hamstring strain injury (HSI) has become the most common noncontact injury in soccer. Isokinetic muscle strength deficits are considered a risk factor for HSIs. However, underpowered studies with small sample sizes unable to determine small associations have led to inconclusive results regarding the role of isokinetic strength and strength testing in HSIs. Purpose: To examine whether differences in isokinetic strength measures of knee flexion and extension represent risk factors for hamstring injuries in a large cohort of professional soccer players in an adequately powered study design. Study Design: Cohort study; Level of evidence, 2. Methods: A total of 614 professional soccer players from 14 teams underwent isokinetic strength testing during preseason screening. Testing consisted of concentric knee flexion and extension at 60 deg/s and 300 deg/s and eccentric knee extension at 60 deg/s. A clustered multiple logistic regression analysis was used to identify variables associated with the risk of HSIs. Receiver operating characteristic (ROC) curves were calculated to determine sensitivity and specificity. Results: Of the 614 players, 190 suffered an HSI during the 4 seasons. Quadriceps concentric strength at 60 deg/s (odds ratio [OR], 1.41; 95% CI, 1.03-1.92; P = .03) and hamstring eccentric strength at 60 deg/s (OR, 1.37; 95% CI, 1.01-1.85; P = .04) adjusted for bodyweight were independently associated with the risk of injuries. The absolute differences between the injured and uninjured players were 6.9 N·m and 9.1 N·m, with small effect sizes ( d < 0.2). The ROC analyses showed an area under the curve of 0.54 and 0.56 for quadriceps concentric strength and hamstring eccentric strength, respectively, indicating a failed combined sensitivity and specificity of the 2 strength variables identified in the logistic regression models. Conclusion: This study identified small absolute strength differences and a wide overlap of the absolute strength measurements at the group level. The small associations between lower hamstring eccentric strength and lower quadriceps concentric strength with HSIs can only be considered as weak risk factors. The identification of these risk factors still does not allow the identification of individual players at risk. The use of isokinetic testing to determine the association between strength differences and HSIs is not supported.

scholarly journals Variations of training load, monotony, and strain and dose-response relationships with maximal aerobic speed, maximal oxygen uptake, and isokinetic strength in professional soccer players

PLoS ONE ◽  
2019 ◽  
Vol 14 (12) ◽  
pp. e0225522 ◽  
Author(s):  
Filipe Manuel Clemente ◽  
Cain Clark ◽  
Daniel Castillo ◽  
Hugo Sarmento ◽  
Pantelis Theodoros Nikolaidis ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Dose Response ◽  
Maximal Oxygen Uptake ◽  
Training Load ◽  
Soccer Players ◽  
Isokinetic Strength ◽  
Professional Soccer ◽  
Maximal Aerobic Speed

scholarly journals Isokinetic Strength and Strength Asymmetries of Lower Extremities in Professional Soccer Players

2019 ◽  
Vol 51 (Supplement) ◽  
pp. 64
Author(s):  
Tomas Maly ◽  
Frantisek Zahalka ◽  
Kevin R. Ford ◽  
Dai Sugimoto ◽  
Lucia Mala ◽  
...  
Keyword(s):  
Lower Extremities ◽  
Soccer Players ◽  
Isokinetic Strength ◽  
Professional Soccer

scholarly journals Match-related physical performance in professional soccer: Position or player specific?

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0256695
Author(s):  
Stefan Altmann ◽  
Leon Forcher ◽  
Ludwig Ruf ◽  
Adam Beavan ◽  
Timo Groß ◽  
...  
Keyword(s):  
Individual Differences ◽  
Physical Performance ◽  
Normative Data ◽  
Recovery Process ◽  
Soccer Players ◽  
Large Individual ◽  
Inclusion Criteria ◽  
Professional Soccer ◽  
Positional Data ◽  
Physical Match

The purpose of this study was to examine to what extent the physical match performance of professional soccer players is both position and player specific. First, official match data from the 2019/20 German Bundesliga season was used to search for players that met the inclusion criteria of playing a minimum of four entire matches in at least two different playing positions. Overall, 25 players met the criteria prior to the COVID-19 induced break, playing a minimum of eight matches. Second, the physical match performance of these players was analyzed separately for each position they played. The following four parameters were captured: total distance, high-intensity distance, sprinting distance, and accelerations. Third, the 25 players’ physical match performance data was then compared to normative data for each position they played to understand whether players adapted their physical performance (position dependent), or maintained their performance regardless of which position they were assigned to (position independent). When switching the position, the change in physical match performance of the respective players could be explained by 44–58% through the normative positional data. Moreover, there existed large individual differences in the way players adapted or maintained their performance when acting in different positions. Coaches and practitioners should be aware that some professional soccer players will likely incur differences in the composition of physical match performance when switching positions and therefore should pay special consideration for such differences in the training and recovery process of these players.

A study on the urine specific gravity before training and sweating response during training of professional soccer players

2007 ◽  
Vol 16 (1) ◽  
pp. 31-38
Author(s):  
YoungSoo Lee ◽  
Siyoung Kim ◽  
Lee sang ho ◽  
Sanghyoun Lee
Keyword(s):  
Specific Gravity ◽  
Soccer Players ◽  
Urine Specific Gravity ◽  
Professional Soccer
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