ArticleBMC sports science, medicine & rehabilitation2026
The role of dynamic control ratio at the equilibrium point of athletes on acceleration and deceleration performance.
Article in BMC sports science, medicine & rehabilitation, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundConventional hamstring-to-quadriceps (H:Q) ratios may not adequately reflect functional muscle balance during high-speed movements. As a more functionally relevant parameter, the dynamic control ratio at the equilibrium point (DCRe), which identifies the specific joint angle where eccentric hamstring torque counterbalances concentric quadriceps torque, has been proposed; however, its relationship with performance variables remains unclear. Therefore, this study aimed to investigate the effect of DCRe, as well as conventional (Hc:Qc) and functional (He:Qc) hamstring-to-quadriceps ratios, on acceleration and deceleration performance in athletes.
methodsThis cross-sectional study included forty team sport athletes (age: 22.00 ± 2.90 years; body weight: 76.52 ± 11.77 kg; height: 178.12 ± 6.02 cm; training age: 11.15 ± 2.72 years). Eccentric and concentric isokinetic strength tests were performed in the seated position at angular velocities of 30°/s, 90°/s, and 150°/s. Strength data were filtered using an Equiripple low-pass filter with a 6 Hz cut-off frequency and DCRe angle and torque values were identified through a coding method in MATLAB. Acceleration was assessed using a 10-meter sprint test, while deceleration was evaluated based on stopping distance and time. The effects of strength variables on performance were analyzed using linear regression, and no multicollinearity was observed (VIF < 10, Tolerance > 0.10).
resultsDCRe angle values were found to be 27.7°, 26.2°, and 26.4°, and torque values were 1.74, 1.76, and 1.73 N·m/kg at 30°/s, 90°/s, and 150°/s, respectively. DCRe parameters and Hc:Qc and He:Qc ratios did not significantly affect acceleration (p > 0.05). However, Hc:Qc at 90°/s and 150°/s, and He:Qc at 150°/s significantly affected deceleration time (p < 0.05).
conclusionAlthough DCRe parameters did not directly influence acceleration or deceleration performance, the influence of hamstring-to-quadriceps strength ratios at higher speeds suggests that eccentric-based neuromuscular control may play a critical role in braking actions. Further studies involving elite team sport athletes are needed to better understand the potential role of DCRe in athletic performance.
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