## 4 Discussion
This finding suggests that individuals with a lower flexor to extensor muscle twitch latency ratio to electrical stimulation have a higher flexor-to-extensor muscle peak concentric torque ratio, which has been shown to be associated with a lower risk of knee joint injury [20], [PERSON] et al. [21] used a similar methodological approach to investigate the relationships between muscle asymmetries measured with an isokinetic dynamometer, vertical jump height and various TMG parameters. In contrast to our results, they found a moderately positive correlation between Td and maximal knee flexor torque measured at 300\({}^{\circ}\)/s (r = 0.53; \(p\) < 0.05), but no correlation at 60\({}^{\circ}\)/s (r = 0.10; \(p\) > 0.05) [21]. However, a direct physiological comparison of these associations with our results is not possible, as the ratio between flexor and extensor was not measured in the subjects. The effect of muscle contraction velocity (joint angular velocity) on peak torque and Td is most likely not the same as the effect on flexor-extensor ratio. This needs to be investigated in the future. Of all the TMG ratios measured in our subjects, the closest associations with the isokinetic ratios were observed for the values calculated from Tc, which is basically an index of the rate of force development during muscle twitch. A longer contraction time (Tc) indicates slower force development and is often associated with a greater proportion of type I muscle fibres. However, this relationship is not exclusive and may be influenced by various other factors, including differences in muscle architecture, fatigue, and neural control mechanisms [22]. The recruitment pattern of muscle fibres is multifactorial, depending on the type, intensity, and duration of activity. During low-intensity contractions, type I fibres are predominantly activated, whereas increasing contraction intensity and duration progressively recruit type II fibres [22]. Therefore, Tc values should be interpreted with caution and not regarded as a definitive indicator of fibre type distribution. Individuals with a higher proportion of type II fibres are therefore able to generate higher peak torques at higher angular velocities during isokinetic tests [23]. Considering that the relationship between the ratio of \(\mathrm{Tc_{FL}}\)/\(\mathrm{Tc_{EXT}}\) and \(\mathrm{Tc_{EF}}\)/\(\mathrm{Tc_{EXT}}\) and the functional isokinetic ratio was significant at medium (180\({}^{\circ}\)/s) and high (240\({}^{\circ}\)/s) but not at low (60\({}^{\circ}\)/s) angular velocities, it appears that Tc is predominantly a function of fast muscle fibres, which are only activated to any significant extent at angular velocities of 180\({}^{\circ}\)/s or more [24]. A significant correlation between several basic isokinetic parameters and Tc was also found in other studies. [PERSON] et al. [11] found a positive correlation between knee extensor strength at 60\({}^{\circ}\)/s and the Tc of the vastus medialis muscle (r = 0.41; \(p<0.05\)). In another study, [PERSON] et al. [12] investigated the concurrent and predictive validity of isokinetic dynamometry and TMG in men and women with different physical performance levels. They divided the subjects into three groups according to their training status, namely, physically inactive, physically active and elite athletes. Correlations were first calculated for the gender-specific subgroups only and then for the gender-specific and physically active subgroups. They found that there was a negative correlation between the maximum torque of the knee extensors at 60\({}^{\circ}\)/s and the Tc of the rectus femoris muscle in elite athletes of both genders. In physically inactive women, they found a negative correlation between the maximum torque of the knee extensors at 180\({}^{\circ}\)/s and the Tc of the rectus femoris muscle (r = \(-0.541\); \(p<0.05\)).