DEVELOPING A PREDICTIVE EQUATION FOR KNEE MUSCLE STRENGTH IN MALE MUAY THAI FIGHTERS AGED 20-39

Abstract

Knee extensor and flexor strength are crucial for Muay Thai performance, yet predictive models remain limited. This study developed a predictive equation for knee muscle strength in male fighters aged 20-39 using body mass, age, and tibia length as predictors. Ten fighters underwent isokinetic dynamometry at 60°/s. Stepwise regression identified body mass as the strongest predictor for knee extension peak torque (EPT) (p < 0.001), with age also contributing (p = 0.028). Tibia length had no significant effect (p > 0.05). The model for EPT showed strong explanatory power (adjusted R² = 0.798), while knee flexion peak torque (FPT) was predicted only by body mass (adjusted R² = 0.243). Reliability was high (ICC = 0.929 for EPT, ICC = 0.921 for FPT). This model helps optimize training, monitor performance, and reduce injury risk. Future studies should expand the sample size and include neuromuscular coordination metrics for improved accuracy.