Composite jump analytics — Docs

Composite analytics compare two jump types against each other. The comparison gives you a deeper understanding of your performance profile, readiness and progression.

Each score needs a specific pair of jumps recorded in the same set. Metric Jump classifies every rep automatically as you go. See Jump classification. Metric Jump then pairs the reps up and reports the comparison once the set has what it needs.

Record the right jumps

For each comparison, record both jump types in the one set. If a test type is missing, Metric Jump still reports the per-rep metrics. Metric Jump does not compute the composite score.

Comparison	Record in the same set:
Eccentric utilisation ratio	A CMJ and a paused squat jump
Arm swing contribution	An Abalakov and a hands-on-hips CMJ
Left-right symmetry	Single-leg jumps on both the left and the right
Bilateral index	A left single-leg, a right single-leg, and a two-leg CMJ

Eccentric utilisation ratio (EUR)

Needs a CMJ and squat jump.

The ratio is CMJ height divided by squat jump height. It shows how well you are able to use the stretch-shortening cycle to generate more jump height over a dead-stop jump.

A ratio of 1.0 means the countermovement and squat jump are identical. At 1.0 you are not able to use the stretch-shortening cycle at all to increase jump height. The higher your ratio, the more elastic and explosive you are.

Athletes with a consistently low EUR (under 1.1) may benefit from plyometric style training to improve elasticity.

Arm swing contribution

Needs an Abalakov (full arm swing) and a hands-on-hips CMJ.

The contribution is how much height the swing adds, as a percentage of the CMJ.

An arm swing should add 10% or more for most athletes. A low % contribution can point to arm-swing timing, skill or coordination issues with jumping. Those issues might warrant skill practice. This applies especially in jump dominated sports like Australian football, volleyball and basketball, which require a lot of arm swing jumps.

Left-right symmetry

Needs single-leg jumps on both sides.

Metric Jump compares the left and right reps and reports the gap as a percentage.

Under 10% asymmetry is considered normal and balanced. A gap of 10–20% is worth noting. An asymmetry of more than 20% might warrant a closer look. Symmetry on strength, power and mobility are common thresholds in return-to-play screening after injury or surgery.

Bilateral index

Needs a left single-leg, a right single-leg, and a CMJ (double leg).

The index compares your two-leg output against the sum of the two single legs.

Typically the sum of performance on each leg individually is higher than a double leg performance. This is known as the bilateral deficit. The deficit varies, and some athletes even show the opposite, with a negative index.

Neither result is good or bad on its own. Each result is a profile of where your force comes from and a baseline to retest against. Poor single leg jumping compared to double leg jumps can suggest a lack of ankle or hip stability. It can also suggest poor coordination and control on one leg, or balance issues. Athletes who do largely bilateral training tend to have lower scores. Those athletes may require specific unilateral training to improve single-leg performance.

Reading the scores

These scores are designed to be tracked over time. A single score can help with program design and with profiling athlete strengths and weaknesses. A single score is still less valuable than the change in that score over time.

Retest regularly. Use the data to help inform individualised program modifications.

For the per-rep metrics that feed these comparisons, see Jump metrics.