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Reliability and validity of the 30-second chair-stand test for assessing functional capacity in women with endometriosis: a cross-sectional and longitudinal study

Journal of Gynecology Obstetrics and Human Reproduction·August 2Open Access
Obstetrics & GynecologyConfirms priorEndometriosisObservational Longitudinal StudyFunctional Performance TestingAdult

Summary

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What was studied

The 30-Second Chair-Stand Test (30CST) was evaluated for reliability and validity in 54 women with endometriosis across three time points: in-clinic baseline (T1), at-home pre-menstruation (T2), and at-home during menstruation (T3).

Key findings

Reliability was high across all settings (ICC: 0.985, 0.975, 0.981 at T1–T3). During menstruation, women performed significantly fewer repetitions than pre-menstruation (mean difference = −1.22 reps, p < 0.001; SRM = −0.436). Women with high pain scores (≥7) performed significantly fewer reps than those with lower scores (p < 0.001; Cohen's d = 1.59).

Study limitations

Small sample (n = 54) limits generalizability. Self-administered home testing relies on participant adherence and self-report accuracy. No comparator group of women without endometriosis was included.

Clinical implications

The 30CST is a simple, reliable tool that clinicians can use to track functional capacity in women with endometriosis — including at home, across the menstrual cycle. Women reporting pain ≥7 show meaningfully worse physical performance, making the 30CST a practical complement to pain assessment in this population.

Caveats

  • No comparator group without endometriosis is described, so 'validity' here refers specifically to construct and longitudinal validity within this population, not diagnostic accuracy.
  • The DOI and publication year (2026) are as provided; this is an ahead-of-print or recently published article and may not yet be indexed in all databases.
  • The full text was not accessible (publisher page returned a CAPTCHA); all data extracted from the abstract only — additional detail (e.g., MDC values, participant age, staging of endometriosis) may be present in the full paper.

Related Questions

Explore related topics

What physical function tests are reliable for women with endometriosis?How does the menstrual cycle affect exercise capacity and physical performance in endometriosis?How can pain severity be linked to functional outcomes in women with chronic pelvic pain?

Publication Details

Year
2026
Journal
Journal of Gynecology Obstetrics and Human Reproduction
Sample Size
n=54
Source
View article
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