Here is a great article about the Hamstring/Quadricep ratio written by our founder Carlos Wheeler.

It is widely known in the medical field of football, that knee injury is one of the most important
problems in professional schools of soccer. One of the most widely used neuromuscular assessments
to determine knee joint injury risk has been the Hamstring/Quadriceps (H/Q) force ratio. Although
Maximum Voluntary Contraction (MVC) has often been used to evaluate the H/Q ratio, the ability
to rapidly develop force (Rate of Force Development-RFD) is more relevant in relation to fast
dynamic movements. The objective of this study was to evaluate the RFD in the hamstrings and
quadriceps to determine the (H/Q) ratio and compare it with the H/Q ratio of the MVC, a test
traditionally used in soccer.

The objective of this study was to evaluate the RFD in the hamstrings and
quadriceps to determine the (H/Q) ratio and compare it with the H/Q ratio of the MVC, a test
traditionally used in soccer. Thirty professional soccer players participated in the study (15 women:
Age 20.9 ± 1.9 years; body weight 69 ± 1.9 kg; height 169 ± 27 cm), (15 men Age 25.8 ± 2 years; body
weight 73 ± 3.1 kg; size 172 ± 3.9 cm), belonging to the Fortaleza CEIF professional team from the
city of Bogotá Colombia. We evaluated the maximum isometric force in knee flexion at 70° and in
the same way it was performed in knee extension at 70° for 5s, to determine the MVC and RFD of
the hamstrings and quadriceps at the evaluated angle. The reliability of the test for RFD I/C was high
(intraclass correlation coefficient = (0.664-0.933). The initial contraction phases up to 50 ms from
the start of contraction showed a low RFD I/C ratio compared to the MVC ratio. I/C (p=0.001).
These results demonstrate a potential risk for stabilization of the knee joint during the initial phase
of muscle contraction.

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