Game Position Impacts on Angle-Specific and Non-Angle-Specific Hamstring-to-Quadriceps Ratios in the Czech Republic First League Soccer Players

Umur SISLI

Master's thesis

Game Position lmpacts on Angle-Specific and Non-Angle-Specific Hamstring-to-Quadriceps Ratios in the Czech Republic First League Soccer Players

Abstract:

This study adopted a cross-sectional study design. A total of 104 soccer players from the Czech Republic 1st league teams, including 11 goalkeepers, 34 defenders, 35 midfielders and 24 forwards. The participants performed the knee concentric extension/concentric flexion and eccentric extension/concentric flexion tests with their maximum strength. The maximal range of movement was defined between 180 (full knee extension) to 100, and the players performed the test at an angular velocity of 60/s for concentric/concentric contraction and 30/s for eccentric contraction. As for angle-specific H:Q ratio calculation, the hamstrings eccentric concentric angle-specific torque, at each knee-joint angle, was divided by the quadriceps concentric angle-specific torque, at the same knee-joint angle. For calculation of the non-angle-specific conventional H:Q ratio, the hamstrings eccentric and concentric peak torques were divided by the quadriceps concentric peak torque.

Abstract:

The main aim of this study was to investigate differences between the functional hamstring to quadriceps (H:Qfunc) and conventional hamstring to quadriceps (H:Qconv) ratios between the Czech first league soccer players with different game positions.This study adopted a cross-sectional study design. A total of 104 soccer players from the Czech Republic 1st league teams, including 11 goalkeepers, 34 defenders, 35 midfielders and 24 forwards. The participants performed the knee concentric extension/concentric flexion and eccentric extension/concentric flexion tests with their maximum strength. The maximal range of movement was defined between 180 (full knee extension) to 100, and the players performed the test at an angular velocity of 60/s for concentric/concentric contraction and 30/s for eccentric contraction. As for angle-specific H:Q ratio calculation, the hamstrings eccentric concentric angle-specific torque, at each knee-joint angle, was divided by the quadriceps concentric angle-specific torque, at the same knee-joint angle. For calculation of the non-angle-specific conventional H:Q ratio, the hamstrings eccentric and concentric peak torques were divided by the quadriceps concentric peak torque.

Keywords

Isokinetic strenght ratio, knee muscle balance, functional ratio, conventional ratio, football, game position

Language used: English

Date on which the thesis was submitted / produced: 30. 4. 2021

Thesis defence

• Supervisor: Javad Sarvestan

Palacký University Olomouc

Faculty of Physical Culture

Master programme / field:
Physical Education and Sports / Physical Activity and Active Living