Abstract:
AIMS:To characterize levator ani muscle (LAM) activity in nulligravidas using magnetomyography (MMG) and define MMG characteristics associated with LAM activity with and without accessory muscle contributions. METHODS:MMG data were collected from eight nulligravidas during rest and voluntary LAM contractions (Kegels) of varying intensity. We utilized simultaneous vaginal manometry and surface electromyography (sEMG) to evaluate for accessory muscle recruitment. Moderate Kegel (MK) MMG trials were sub-selected based on the presence or absence of accessory muscle interaction. Amplitude and spectral-related indicators were calculated across MK epochs: root-mean square (RMS) amplitude, percentage amplitude relative to rest, and relative power spectrum density (rPSD) in three frequency bands (low, middle, high). Ternary diagram characterized rPSD from selected Kegels and ROC analysis was performed to identify cut-points to differentiate MKs from interacting MKs. RESULTS:Nineteen MMG recordings were obtained. Amplitude and spectral parameters were significantly different between isolated and interacting MK epochs. Mean RMS and power values of the isolated MK were, respectively, 120.66 ± 43.8 fT and 1.72 ± 1.44 (T2 /Hz)*10-28 . Amplitudes of MK were 64% and 117 higher than baseline activities for the isolated and interacting epochs, respectively. ROC curves reveled cut-off points on low and middle frequency bands that achieved perfect separation (ROC-AUC = 1.0) between isolated and interacting MK. CONCLUSIONS:Our study demonstrates that MMG, a novel biomagnetic technique, allows precise detection and characterization of normal female pelvic floor function. Results show that isolated moderate voluntary contraction of the LAMs produces distinct MMG amplitude and spectral characteristics compared with Kegels involving co-activation of other muscle groups.
journal_name
Neurourol Urodynjournal_title
Neurourology and urodynamicsauthors
Escalona-Vargas D,Oliphant S,Siegel ER,Eswaran Hdoi
10.1002/nau.23870subject
Has Abstractpub_date
2019-01-01 00:00:00pages
151-157issue
1eissn
0733-2467issn
1520-6777journal_volume
38pub_type
杂志文章abstract:AIMS:Many patients take alternative medications for their lower urinary tract symptoms (LUTS) either in addition or as a substitute for traditional therapies, despite a lack of clinical data. Grapes products are hypothesized to improve bladder function due to their antioxidant and membrane-protective actions. There is ...
journal_title:Neurourology and urodynamics
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