Effect of Hip Flexion Angle on the Hamstring to Quadriceps Strength Ratio
The purpose of this study was to compare the hamstring to quadriceps ratio (H:Q) obtained from three different hip flexion angles. Seventy-three young athletes performed maximum isokinetic concentric and eccentric knee extension and flexion efforts at 60 °·s<sup>−1&...
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| Main Authors: | , , |
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| Format: | Book |
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MDPI AG,
2019-02-01T00:00:00Z.
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| Summary: | The purpose of this study was to compare the hamstring to quadriceps ratio (H:Q) obtained from three different hip flexion angles. Seventy-three young athletes performed maximum isokinetic concentric and eccentric knee extension and flexion efforts at 60 °·s<sup>−1</sup> and 240 °·s<sup>−1</sup> from hip flexion angles of 90°, 60°, and 120°. The conventional (concentric to concentric), functional (eccentric to concentric) and mixed (eccentric at 30 °·s<sup>−1</sup> to concentric torque at 240 °·s<sup>−1</sup>) H:Q torque ratios and the electromyographic activity from the rectus femoris and biceps femoris were analyzed. The conventional H:Q ratios and the functional H:Q ratios at 60 °·s<sup>−1</sup> did not significantly differ between the three testing positions (<i>p</i> > 0.05). In contrast, testing from the 90° hip flexion angle showed a greater functional torque ratio at 240 °·s<sup>−1</sup> and a mixed H:Q torque ratio compared with the other two positions (<i>p</i> < 0.05). The hip flexion angle did not influence the recorded muscle activation signals (<i>p</i> > 0.05). For the range of hip flexion angles tested, routine isokinetic assessment of conventional H:Q ratio and functional H:Q ratio at slow speed is not angle-dependent. Should assessment of the functional H:Q ratio at fast angular velocity or the mixed ratio is required, then selection of hip flexion angle is important. |
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| Item Description: | 2075-4663 10.3390/sports7020043 |