Star Excursion Balance Test (SEBT): 8-direction protocol and reference standards

The Star Excursion Balance Test (SEBT) is the "big brother" of the Y Balance Test: more thorough, with 8 reach directions instead of 3, and widely used in research and performance assessments where a more detailed profile of dynamic postural control is needed.

If you have time for a more thorough assessment, or work with high-level athletes where every detail of asymmetry matters, the SEBT gives you a much more complete picture than its shortened versions.

What does this test measure?

The SEBT measures dynamic balance and neuromuscular control of the lower limb through the ability to reach the maximum possible distance in 8 different directions (anterior, anteromedial, medial, posteromedial, posterior, posterolateral, lateral, and anterolateral) while maintaining balance on one leg.

The greater the distance reached while maintaining control, the greater that limb's dynamic stability capacity.

Equipment needed

• Tape laid out on the floor in the shape of an 8-line star, each line separated by 45°, each at least 1.2 m long
• A measuring tape
• Usual training footwear or barefoot (always standardize the same condition)

Step-by-step protocol

1. The person stands in the center of the star, balancing on one leg only, with their hands on their hips
2. Using the free leg, they must reach the maximum possible distance along each of the 8 lines, lightly touching the floor with the toe without bearing weight, and return to the central position while maintaining balance
3. If they lose balance, place the free leg down, or fail to return to the central position in a controlled manner, the attempt is invalid and must be repeated
4. Perform 3-4 practice trials per direction before recording (there's a significant learning effect)
5. Record 3 valid attempts per direction and leg, noting the best mark
6. Measure leg length (ASIS to medial malleolus) to normalize: distance reached / leg length × 100

Common mistakes

• Skipping the familiarization trials (the learning effect in the SEBT is very pronounced and skews early measurements)
• Not checking that the person keeps their hands on their hips (using the arms to "help" changes the result)
• Comparing absolute distances between people without normalizing for leg length

How to interpret the result

Metric	Reference / interpretation
Difference between legs in any direction	> 4 cm is considered a clinically relevant asymmetry
Directions most sensitive to ACL injury or ankle sprain	Anterior, posteromedial, and posterolateral are the most studied and discriminative
Normalized composite score	Mainly useful for comparing the person against their own contralateral leg or against previous assessments

As with the YBT, absolute values vary widely depending on height, sport, and level, so the most useful information is almost always the comparison between legs and over time.

Related tests

• Y Balance Test (YBT) — a simplified 3-direction version, faster if you don't need the full 8-direction profile
• Single-leg balance test — a good starting point if the person doesn't yet have enough control to perform the SEBT reliably

Manage SEBT data without losing your mind

With 8 directions, 2 legs, and several attempts per direction, the SEBT generates a huge amount of numbers per session. Doing it by hand in a spreadsheet is doable the first time, but comparing the progress of each direction session after session quickly becomes chaotic. In Movalytics you can record the 8 directions for each leg, and the app automatically shows you the asymmetries and progress by direction, so you can spot patterns that would otherwise go unnoticed.

Frequently asked questions

How long does a complete SEBT assessment take? Including familiarization trials, between 15 and 25 minutes for both legs, depending on the person's prior experience with the test. What's the real difference compared to the Y Balance Test? The SEBT assesses 8 directions and requires drawing the full star on the floor; the YBT uses only 3 directions (the most discriminative ones) with a standardized device, making it faster but somewhat less detailed. Is it useful for deciding return to sport after an injury? It's a useful tool within a broader battery, but shouldn't be the sole criterion. It's recommended to combine it with strength tests, jump tests, and clinical criteria from the rehabilitation team.