Eccentric Utilization Ratio

In biomechanics, the eccentric utilization ratio (EUR) describes how effectively an athlete uses the stretch-shortening cycle (SSC) to enhance force and power production. It is commonly calculated using force plate data by comparing performance in a countermovement jump (CMJ), which includes an eccentric loading phase, to a squat jump (SJ), which minimizes pre-tretch.
The ratio (CMJ ÷ SJ) reflects the additional output generated through elastic energy storage neuromuscular potentiation and reflex contributions during the SSC.

Force plates are central to measuring EUR because they provide high-resolution ground reaction force data that reveal the timing and magnitude of eccentric and concentric phases.
During the CMJ, the force plate captures the rapid eccentric dip where muscles and tendons lengthen under load. This phase stores elastic energy in the musculotendinous system and activates stretch reflexes. When immediately followed by a concentric push-off, the stored energy and neural facilitation increase force output and rate of force development. A higher
EUR suggests that an athlete effectively exploits this coupling, translating eccentric loading into enhanced propulsion.

Practically, coaches use EUR to profile athletic qualities and guide training. A very low ratio may indicate poor SSC efficiency or limited reactive strength, suggesting a need for plyometric or eccentric-focused work. Conversely, an extremely high ratio might reveal reliance on elastic mechanisms but insufficient concentric strength. Because force plates also allow analysis of impulse, braking forces, and contact times, EUR becomes more than a simple ratio—it becomes a window into euromuscular strategy. In this way, EUR helps practitioners tailor programs that balance strength, elasticity, and coordination for improved performance.

Coach Jared