Investigating the Development of Hamstring Strength, Force, and Power in Division I College Football Athletes

Abstract

The purpose of this study was to examine the effects of an eight-week strength and conditioning program on hamstring strength, force, and power development in Division I collegiate football players. Using VALD Performance technologies, the NordBord Hamstring Testing System and dual Force Plates, this research assessed changes in eccentric hamstring force, countermovement jump (CMJ) height, rate of force development (RFD), and interlimb asymmetry across positional and year groups. Paired-samples t-tests compared baseline and post-intervention values with significance established a priori at p < 0.05. Although results did not reach statistical significance, descriptive findings demonstrated meaningful positive adaptations. Average left-leg maximal eccentric force increased by 10.8% and right-leg force by 0.8%. Countermovement jump height improved by 1.9% and eccentric braking RFD by 5.7%, suggesting enhanced concentric and eccentric lower-body function. The largest relative improvements occurred among quarterbacks, defensive linemen, and tight ends, while freshmen and sophomores exhibited the most pronounced relative gains, indicating strong responsiveness to the training cycle. Interlimb asymmetry remained stable and within acceptable thresholds (<10% to 15%), demonstrating that bilateral strength increased without increasing imbalance. These findings align with prior research emphasizing the role of eccentric-focused training in enhancing performance and mitigating injury risk. The integrated use of eccentric resistance, plyometric, and velocity-based methods produced measurable physiological adaptations with meaningful practical implications for performance and injury prevention in collegiate football.