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The Urine Stream Interruption Test and pelvic muscle function.

C M Sampselle1, J O DeLancey

  • 1University of Michigan, School of Nursing, Ann Arbor.

Nursing Research
|March 1, 1992
PubMed
Summary
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The Urine Stream Interruption Test (UST) reliably measures pelvic floor muscle strength. Stronger muscles correlate with better urine flow control, while increased childbirths (parity) decrease this ability.

Area of Science:

  • Urogynecology
  • Pelvic Floor Physical Therapy
  • Female Pelvic Medicine

Background:

  • Pelvic floor muscle (PFM) dysfunction affects urinary control.
  • Objective measures are needed to assess PFM function.
  • The Urine Stream Interruption Test (UST) was developed to evaluate PFM's ability to impede urine flow.

Purpose of the Study:

  • To assess the repeatability of the UST.
  • To examine the relationship between UST results and other PFM strength measures.
  • To investigate the impact of parity on PFM function as measured by the UST.

Main Methods:

  • Seventy-five women (nulliparous, primiparous, secundiparous) participated.
  • Repeatability of the UST was assessed.
  • Correlation between UST and Digital Measure for PFM strength was calculated.

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  • Analysis of variance (ANOVA) was used to compare UST scores across parity groups.

    • Main Results:

    • The UST demonstrated good repeatability (r = .83).
    • Stronger PFM strength (Digital Measure) correlated with faster urine stream interruption (r = -.55 to -.59).
    • Increased parity was significantly associated with reduced ability to stop urine flow (F = 10.2, p < .001), with longer interruption times in secundiparas and primiparas compared to nulliparas.

    Conclusions:

    • The UST is a repeatable and valid tool for assessing PFM function related to urine flow.
    • PFM strength is inversely related to urine stream interruption time.
    • Parity negatively impacts PFM function, highlighting potential for targeted interventions.