Before you start

For a supervising adult running the CDC STEADI 30-Second Chair Stand. The app gives the “Go”, times 30 seconds and counts full stands from the camera, so you can watch the participant. Afterwards you check each counted or doubtful rise against still images. It flags many situations where it could not measure reliably — not all of them — so every count must be checked.

What it does not do: it does not diagnose or predict falls, and it shows the CDC comparison table only after the count has been checked.

Just looking, with no chair or helper? Try the whole test with a computer-drawn simulated participant, about 2 minutes. It is labelled SIMULATED DEMO everywhere and measures no one. This button ticks the boxes below for the simulated scene and keeps still images so you can try the checks.

Safety and set-up (you confirm these) A helper will stand next to the participant for the whole test (CDC: “Stand next to the patient for safety”). The chair has a straight back, no arm rests, about 17 in (43 cm) seat height, and cannot slide. The participant agrees, is comfortable standing up repeatedly, and knows to stop at any discomfort. The camera sees the participant from the side, head to feet. The helper stays beside them within reach and should not pass between the camera and the participant unless needed for safety.

Needed for the CDC comparison table

Only used to look up the CDC table (ages 60–94). Never estimated from video. Whole numbers only. You can also enter or correct these on the review screen.

Age Table column

Evidence images for checking afterwards Keep temporary still images (needed for the app to report a camera count) of the practice stand and the test (about 6 per second) so I can check each rise afterwards. They stay inside this browser tab, are not uploaded, not saved to files and not in the downloaded record, and are released at New test, Back or when the tab closes.

Browser storage note

The browser itself may hold image data in its own temporary storage, which the app cannot control.

Needed for a reported camera count: without images the app still times and counts, but nobody can check the count afterwards, so it is not reported or compared with the CDC table. (You can report your own count instead.)

Sound Quiet counting: no tone for each counted stand (only the GO and END tones). Use this when a separate recording will be counted by someone else, so the recording does not reveal the app's count.

Choose a video source

The participant agreed to be on camera. I understand the video is analysed in this browser tab only and is not uploaded.

Tick the 4 safety boxes and the camera-consent box above to enable.

Practice / demonstration: analyse a video file already on this computer. Results are labelled REPLAY and are not a live test.

Replay a video file…

No camera, chair or helper at hand? Try the whole workflow with a computer-drawn simulated participant. Everything in it is labelled SIMULATED DEMO: it is not a real person and not a real measurement. Nothing is filmed. In the demo, the 4 safety boxes above describe the simulated scene; tick them as you would for a real test. Tick “Keep temporary still images” as well to try the full check afterwards.

Tick the 4 safety boxes above to enable the demo.

Camera check and practice stand

Loading the pose model…

Read the CDC instructions to the participant: sit in the middle of the chair, hands on the opposite shoulders crossed at the wrists, feet flat on the floor, back straight; on “Go”, rise to a full standing position, then sit back down; repeat for 30 seconds.
Participant fully visible (outlined in green)
Practice stand: stand up fully with arms crossed, hold still for about 1 second, sit down.
Sit still, arms crossed, until “GO”.

More than one person seated? Click on the participant in the picture to select them.

30

seconds left

0

full stands counted

STOP at once for any safety concern, or if the participant must use their arms to stand (CDC: record 0 — answer “Yes” to the arm question afterwards). Stopping for any other reason gives no score.

Check the result

1. The practice stand used as the full-standing reference

2. Was the right person measured?

3. Each rise

4. Did the camera miss any stand?

5. Other things to check

6. Protocol questions (observer answers)

Did the participant use their arms to stand up?

No Yes Not sure

Were the chair and set-up as described (straight back, no arm rests, seat about 17 in / 43 cm, helper beside) and the CDC instructions given (arms crossed at the wrists on the chest, feet flat)?

Yes No

For the CDC table (observer-entered, never estimated):

Age Table column

7. Your own count (optional, kept separately)

Only if you counted full stands yourself during this completed 30-second test. It never replaces the camera count unless you choose it below.

My count How I counted (required)

What will be reported

Change record

Measurement details