Abstract
Introduction and hypothesis
To compare maximum abdominal and pelvic floor muscle (PFM) electromyographic (EMG) and intravaginal pressure (IVP) amplitudes and muscle activation patterns during voluntary PFM contractions between women with and without stress urinary incontinence (SUI).
Methods
Twenty-eight continent women and 44 women with SUI performed single and repeated PFM contractions in supine. Surface EMG data were recorded simultaneously with IVP. Maximum EMG and IVP amplitudes and ensemble average IVP versus EMG curves were determined from the single contractions. Muscle activation timing was determined with cross-correlation functions from the repeated contractions.
Results
The continent group produced higher PFM EMG amplitudes than the SUI group; there were no between group differences in IVP. The women with SUI delayed activating rectus abdominus. The IVP versus EMG curves’ shapes were similar between the groups, however the SUI group had higher abdominal muscle y-intercepts than the continent women.
Conclusions
These findings suggest that women with SUI demonstrate altered motor control strategies during voluntary PFM contractions.
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Abbreviations
- AD:
-
analog to digital
- ANOVA:
-
analysis of variance
- BMI:
-
body mass index
- CI:
-
confidence interval
- EMG:
-
electromyography or electromyographic
- EO:
-
external obliques muscle
- IO:
-
internal obliques muscle
- IVP:
-
intravaginal pressure
- MVC:
-
maximum voluntary contraction
- MVE:
-
maximum voluntary electrical activity
- PFM:
-
pelvic floor muscle
- RA:
-
rectus abdominis muscle
- RMS:
-
root mean square
- SUI:
-
stress urinary incontinence
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Acknowledgements
Financial support for this work was provided by Physicians’ Services Inc. Foundation of Ontario, Canada and the Physiotherapy Foundation of Canada. Infrastructure support was provided by the Canadian Foundation for Innovation and the Ontario Innovation Trust. The authors wish to thank Cindy Brown B.Sc.(PT), M.Sc., Lorraine Chick RN(EC), M.Sc.N., Fabiola Gonçalves B.Sc.(PT), M.Sc., and Roy Young CBET for their assistance with technical support, data collection, and volunteer screening.
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Madill, S.J., Harvey, MA. & McLean, L. Women with SUI demonstrate motor control differences during voluntary pelvic floor muscle contractions. Int Urogynecol J 20, 447–459 (2009). https://doi.org/10.1007/s00192-008-0800-y
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DOI: https://doi.org/10.1007/s00192-008-0800-y