Levator ani muscle in women with genitourinary prolapse: Indirect assessment by muscle histopathology

Heit, Michael; Benson, J. Thomas; Russell, Brenda; Brubaker, Linda

doi:10.1002/(sici)1520-6777(1996)15:1<17::aid-nau2>3.0.co;2-i

Cited by 46 publications

(15 citation statements)

References 22 publications

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“…Slow twitch fibers are suited for providing sustained muscular tone while fast twitch fibers are suited for rapid, forceful contractions. A proportion of about 30% type II fibers has been found in the pubococcygeus muscle …”

Section: Introductionmentioning

confidence: 99%

“…A proportion of about 30% type II fibers has been found in the pubococcygeus muscle. 11,12 Fast contraction velocities play an important role in strength training. Neuromuscular contributions to maximal muscle power (power equals force time velocity) include 1) maximal rate of force development; 2) force production at slow and fast contraction velocities; 3) stretch-shortening cycle performance; and 4) coordination of movement pattern and skill.…”

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confidence: 99%

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Pelvic floor muscle activity during fast voluntary contractions in continent and incontinent women

Leitner

Moser

Eichelberger

et al. 2019

Neurourology and Urodynamics

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Aims Stress urinary incontinence (SUI) has also been attributed to a lower speed of contraction of the pelvic floor muscles (PFM). Therefore, PFM assessment and training implement fast voluntary contractions (FVC). The purpose of the study was to explore FVC regarding feasibility, on‐/offset and rate of activity determination, as well as differences between continent (CON) and stress urinary incontinent (SUI) women. Methods Fifty women were included and examined by means of PFM EMG during rest, maximum voluntary contractions (MVC), and five FVC. MVC‐peak activity was used to normalize EMG‐data. On‐/offset of muscle activity was determined as mean of rectified rest activity plus 1 standard deviation. Linear regression was calculated for rate of activity from onset to peak, peak to offset, and within 200 ms after both onset and peak. Peak activity and time variables related to onset, peak, and offset were calculated. Results On‐/offsets were evaluable for 234/222 of 250 FVC by a computer‐based algorithm, 16/28 on‐/offsets had to be determined manually. There was no significant difference between groups (CON/SUI) regarding FVC peak (92.1/99.3 %MVC), time to peak (514.2/525.6 ms), and increase of activity (182.8/182.1 %MVC/s). The SUI group showed a significantly slower activity decrease (−120.7/−74.4 %MVC/s). Conclusions FVC analyses were shown to be feasible. The significant difference observed between the groups did not refer to activity increase but instead to a prolonged relaxation phase in the SUI group. This prompts to reconsider the interpretation of FVC in PFM testing and training.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Pelvic floor muscle activity during fast voluntary contractions in continent and incontinent women

Leitner

Moser

Eichelberger

et al. 2019

Neurourology and Urodynamics

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“…The support of the bladder neck is thought to have special importance in the case of stress urinary incontinence. The hypothesis of denervation is controversial as other authors could not find signs of denervation in pelvic floor muscle biopsies from incontinent and/or prolapse patients (4). The hypothesis of denervation is controversial as other authors could not find signs of denervation in pelvic floor muscle biopsies from incontinent and/or prolapse patients (4).…”

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confidence: 99%

Determinants of urinary incontinence in a population of young and middle-aged women

Samuelsson¹,

VICTOR²,

SVÄRDSUDD³

2000

Acta Obstet Gynecol Scand

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“…Evaluation of skeletal muscle function and strength involves consideration of both slow and fast‐twitch muscle fibers . Slow‐twitch fibers are dependent upon oxygen and reflect the aerobic capacity of muscles, this is of particular importance, when evaluating PFM as this muscle group is comprised of approximately 70% slow‐twitch fibers . Fast‐twitch fibers are recruited under high force demands, metabolize anaerobically, and reach peak tension two times faster than slow‐twitch fibers .…”

Section: Discussionmentioning

confidence: 99%

Quantification of pelvic floor muscle strength in female urinary incontinence: A systematic review and comparison of contemporary methodologies

Deegan

Stothers

Kavanagh

et al. 2017

Neurourology and Urodynamics

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Technical refinements in both direct and indirect instrumentation for PFM strength measurement are allowing for sensitivity. However, the most common methods of quantification remain digital palpation and perineometry; techniques that pose limitations and yield subjective or indirect measures of muscular strength. Dynamometry has potential as an accurate and sensitive tool, but is limited by inability to assess PFM strength during dynamic movements.

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Levator ani muscle in women with genitourinary prolapse: Indirect assessment by muscle histopathology

Cited by 46 publications

References 22 publications

Pelvic floor muscle activity during fast voluntary contractions in continent and incontinent women

Pelvic floor muscle activity during fast voluntary contractions in continent and incontinent women

Determinants of urinary incontinence in a population of young and middle-aged women

Quantification of pelvic floor muscle strength in female urinary incontinence: A systematic review and comparison of contemporary methodologies

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