Questions: Are there any differences in the displacement and endurance of an elevating voluntary pelvic floor muscle contraction in standing and in crook-lying? Are there any differences in these variables between males and females in either test position? Design: An experimental study. Participants: Forty-five nulliparous female and 20 male participants aged 23 years (SD 3) with no symptoms of urinary incontinence or low back pain. Intervention: Voluntary pelvic floor muscle contraction was measured in both standing and crook-lying. Outcome measures: Transabdominal ultrasound was used to measure the displacement (mm) and endurance (s) of pelvic floor elevation. Results: Displacement was greater in standing than in crook-lying (mean difference 2.6 mm, 95% Cl 1.5 to 3.7). There was no difference between males and females (mean difference 1.3 mm, 95% Cl -0.5 to 3.2). Similarly, endurance of pelvic floor elevation was longer in standing than in crook-lying (mean difference 17.3 s, 95% Cl 12.2 to 22.4). Again there was no difference between males and females (mean difference 0.5 s, 95% Cl -9.3 to 8.3). Conclusion: Standing was found to be a more effective position for achieving and sustaining an elevation of the pelvic floor compared to crook-lying, regardless of sex, and this should be taken into account when assessing and training pelvic floor muscle contraction. © Australian Physiotherapy Association 2007.
Kelly, M., Tan, B. K., Thompson, J., Carroll, S., Follington, M., Arndt, A., & Seet, M. (2007). Healthy adults can more easily elevate the pelvic floor in standing than in crook-lying: An experimental study. Australian Journal of Physiotherapy, 53(3), 187–191. https://doi.org/10.1016/S0004-9514(07)70026-0