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Related Experiment Videos

Variation in urinary flow according to voiding position in normal males.

T Yamanishi1, K Yasuda, R Sakakibara

  • 1Department of Urology, Chiba University, School of Medicine, Chiba city, Chiba, Japan.

Neurourology and Urodynamics
|October 26, 1999
PubMed
Summary

Urinary flow rate in healthy males is highest when voiding in the prone position. This study found significant differences in maximum urinary flow rate between prone and other positions.

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Area of Science:

  • Urology
  • Physiology

Background:

  • Voiding position can influence urinary flow dynamics.
  • Understanding these variations is important for assessing lower urinary tract function.

Purpose of the Study:

  • To investigate the effect of different voiding positions on urinary flow rate in healthy adult males.

Main Methods:

  • Twenty-one healthy males voided in five positions: standing, sitting, lateral, supine, and prone.
  • Urinary flow rate was measured using a portable uroflowmeter (P-Flow).
  • Measurements were taken in random order, with at least two stable voidings per position.

Main Results:

  • Maximum urinary flow rate was greatest in the prone position (28.7 mL/sec).
  • Flow rates were significantly higher in the prone position compared to lateral and supine positions.

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  • The order of maximum flow rate from highest to lowest was: prone, standing, sitting, supine, and lateral.

    • Conclusions:

    • The prone position yields the highest maximum urinary flow rate in healthy males.
    • Voiding position is a significant factor affecting urinary flow parameters.
    • These findings may have implications for uroflowmetry interpretation and patient positioning.