Sit to stand: where the effort actually starts

Situation

A user described standing up from a low chair as the hardest part of the day, more than walking distance.

What we changed

No product change. The case documents the loading sequence and where restriction is reported.

What we observed

The reported effort was concentrated in the seconds before weight transfer, while the knee was still deeply flexed.

Method

Structured interview and video of five repetitions from three chair heights, with the user consenting to publication.

What this does not show

One user, one day, no instrumented force data. Chair heights were not standardised across other cases.

Next step

Add force data and repeat with a comparable second user.