30-Second Sit to Stand Test: protocol and normative values

Few actions are as decisive for an older person's independence as standing up from a chair without help. The 30-Second Sit to Stand Test turns that everyday movement into an objective measure of functional leg strength, and it's one of the most widely used tests in geriatric assessment precisely because it's simple, safe, and highly reproducible.

What does this test measure?

This test measures the muscular strength and endurance of the hip and knee extensors (mainly quadriceps and glutes), by counting how many times a person can fully stand up and sit back down from a chair in 30 seconds, without using their arms.

It's an excellent proxy for functional capacity in everyday activities (getting up from the couch, a car, the toilet) and is associated with fall risk and level of independence.

Equipment needed

• Chair with a straight backrest, no armrests, standard height (~43-45 cm)
• Stopwatch
• A nearby wall to brace the chair against (to prevent it from sliding)

Step-by-step protocol

1. The subject sits in the middle of the chair, back straight, feet flat on the floor hip-width apart, arms crossed over the chest
2. On the cue "go," they must stand up completely (full hip and knee extension) and sit back down, repeating the movement as many times as possible
3. Time 30 seconds and count the number of full repetitions
4. If time runs out mid-repetition and the subject is more than halfway up, count it as a full repetition
5. If the subject needs to push off with their hands at any point, note it (the result is still valid but the modification must be recorded)

Common mistakes

• Allowing arm use without noting it (this completely changes the interpretation)
• Using chairs of different heights across assessments
• Not verifying full hip/knee extension on each repetition (the last reps sometimes get "shortened" due to fatigue)
• Not having someone nearby for safety with people at fall risk

How to interpret the result

Approximate normative values (number of reps in 30 sec):

Age	Men (normal range)	Women (normal range)
60-64 years	14-19	12-17
65-69 years	12-18	11-16
70-74 years	12-17	10-15
75-79 years	11-17	10-15
80-84 years	10-15	9-14
85-89 years	8-14	8-13
90-94 years	7-12	4-11

Values below these ranges are associated with greater fall risk and functional limitation, and are a clear signal to prioritize leg strength work in the program.

Relationship with other tests

This test is one of the components that can be integrated into broader batteries:

• SPPB (Short Physical Performance Battery) — includes a 5-repetition version of this same movement as part of its score
• Functional Step Test — complements strength assessment with a cardiovascular component

Track progress with Movalytics

Leg strength is one of the markers that has the greatest impact on older adults' quality of life, and it's also one of the most motivating to keep working on once improvement is visible. With Movalytics you can record the number of repetitions from each assessment, compare it against normative values by age and sex, and show your client how they're progressing month by month.

Frequently asked questions

Is it safe for people at risk of falls? Yes, as long as someone is nearby to assist if needed and the chair is well braced against a wall. It's one of the safest tests precisely because it reproduces an everyday movement. What if the person can't stand up even once without using their arms? Record it as such (0 reps without support) and, if you want a reference point, repeat allowing arm support, noting the modification for future comparisons. How often should it be repeated? Every 8-12 weeks is reasonable to see real changes related to a strength program, unless working on a rehabilitation process with closer monitoring.