Reliability of different electromyographic normalization methods for pelvic floor muscles assessment

Pereira-Baldon, Vanessa S; Oliveira, Ana Beatriz; Padilha, Juliana Falcão; Degani, Adriana M.; Ávila, Mariana Arias; Driusso, Patrícia

doi:10.1002/nau.24332

“…The mean and peak RMS values represent the mean and peak EMG activity during exercise, respectively. The combination of the two can objectively and reliably reflect the detected muscle contraction [ 24 ].…”

Section: Discussionmentioning

confidence: 99%

The Effects of the Biceps Brachii and Brachioradialis on Elbow Flexor Muscle Strength and Spasticity in Stroke Patients

Yu

¹

,

Zhang

²

,

Cheng

³

et al. 2022

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Objective. Muscle weakness and spasticity are common consequences of stroke, leading to a decrease in physical activity. The effective implementation of precision rehabilitation requires detailed rehabilitation evaluation. We aimed to analyze the surface electromyography (sEMG) signal features of elbow flexor muscle (biceps brachii and brachioradialis) spasticity in maximum voluntary isometric contraction (MVIC) and fast passive extension (FPE) in stroke patients and to explore the main muscle groups that affect the active movement and spasticity of the elbow flexor muscles to provide an objective reference for optimizing stroke rehabilitation. Methods. Fifteen patients with elbow flexor spasticity after stroke were enrolled in this study. sEMG signals of the paretic and nonparetic elbow flexor muscles (biceps and brachioradialis) were detected during MVIC and FPE, and root mean square (RMS) values were calculated. The RMS values (mean and peak) of the biceps and brachioradialis were compared between the paretic and nonparetic sides. Additionally, the correlation between the manual muscle test (MMT) score and the RMS values (mean and peak) of the paretic elbow flexors during MVIC was analyzed, and the correlation between the modified Ashworth scale (MAS) score and the RMS values (mean and peak) of the paretic elbow flexors during FPE was analyzed. Results. During MVIC exercise, the RMS values (mean and peak) of the biceps and brachioradialis on the paretic side were significantly lower than those on the nonparetic side ( p < 0.01 ), and the RMS values (mean and peak) of the bilateral biceps were significantly higher than those of the brachioradialis ( p < 0.01 ). The MMT score was positively correlated with the mean and peak RMS values of the paretic biceps and brachioradialis ( r = 0.89 , r = 0.91 , r = 0.82 , r = 0.85 ; p < 0.001 ). During FPE exercise, the RMS values (mean and peak) of the biceps and brachioradialis on the paretic side were significantly higher than those on the nonparetic side ( p < 0.01 ), and the RMS values (mean and peak) of the brachioradialis on the paretic side were significantly higher than those of the biceps ( p < 0.01 ). TheMAS score was positively correlated with the mean RMS of the paretic biceps and brachioradialis ( r = 0.62 , p = 0.021 ; r = 0.74 , p = 0.004 ), and the MAS score was positively correlated with the peak RMS of the paretic brachioradialis ( r = 0.59 , p = 0.029 ) but had no significant correlation with the peak RMS of the paretic biceps ( r = 0.49 , p > 0.05 ). Conclusions. The results confirm that the biceps is a vital muscle in active elbow flexion and that the brachioradialis plays an important role in elbow flexor spasticity, suggesting that the biceps should be the focus of muscle strength training of the elbow flexors and that the role of the brachioradialis should not be ignored in the treatment of elbow flexor spasticity. This study also confirmed the application value of sEMG in the objective assessment of individual muscle strength and spasticity in stroke patients.

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“…The EMG data were processed with a Butterworth High-pass filter (cutoff: 5Hz), full wave rectification and a Butterworth Low-pass filter (cutoff: 400 Hz). Data were smoothed using 50-ms root mean square envelopes and normalized to the peak of the maximum voluntary contraction according to Pereira-Baldon et al 23 Normalized amplitude was recorded as a mean across all trials.…”

Section: Methodsmentioning

confidence: 99%

Mini-Trampoline Jumping as an Exercise Intervention for Postmenopausal Women

Fricke

¹

,

Fink

²

,

Rowlands

³

et al. 2023

Journal of Women's Health Physical Therapy

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Background: Mini-trampoline jumping is a highly beneficial low-impact aerobic exercise capable of potentially improving female-specific health risk factors. Objectives: The aim of this research was to examine the benefits of a 3-month mini-trampoline exercise intervention on bone health and pelvic floor muscles functioning in postmenopausal women. Methods: Thirty-seven healthy postmenopausal women were recruited and participated in the 12-week mini-trampoline exercise intervention. Baseline, postintervention, and 3-month follow-up assessments included bone health, pelvic floor muscles functioning, and urinary incontinence. Results: Bone mineral density increased significantly at postintervention compared with the control group. The exercise group demonstrated decreased stress urinary incontinence scores at postintervention, with the difference being statistically significant at follow-up. No signifi-

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“…Only lower sensors of SARA channel array were used for further analysis, as these sensors were positioned closest to the muscles of interest.The clean MMG data was split into epochs in the window ranging from -3s to +10s with respect to the trigger when voluntary contraction started. We considered the 3s of data before the voluntary contraction as baseline which was then used to apply baseline correction to the 10s data, a common practice in EMG studies [18]. For the accompanying EMG data, the same pre-processing methods were applied as described above for MMG and the cardiac artifact was removed using SUBTR with reference data from maternal ECG electrode.…”

Section: B Signal Processingmentioning

confidence: 99%

Evaluation of Pelvic Floor Muscles in Pregnancy and Postpartum With Non-Invasive Magnetomyography

Escalona‐Vargas

¹

,

Siegel

²

,

Oliphant

³

et al. 2022

IEEE J. Transl. Eng. Health Med.

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To record and characterize features of levator ani muscles (LAM) activity in pregnancy and postpartum using non-invasive and novel Magnetomyography (MMG) technique with amplitude and spectral parameters. Methods: Nulliparous women with uncomplicated pregnancies participated in the MMG data collection during rest and voluntary LAM contractions (Kegels) with modulated intensity in third trimester and approximately 2 months postpartum (PP). Simultaneous surface electromyography was recorded to document the recruitment of accessory muscles. Moderate strength Kegel (MK) MMG trials were analyzed. Amplitude and spectral parameters including root-mean square (RMS) amplitude, power spectrum density (PSD) and normalized PSD (rPSD) in three frequency bands (low, middle, high) were computed on MK epochs. Statistical comparisons between pregnancy and postpartum were calculated. Results: MMG recordings were measured from 10 pregnant women. Results showed decreased RMS and power between third trimester and postpartum, trending towards significance. rPSD values in the low frequency band decreased significantly (p=0.028) from third trimester to postpartum, while significant increase was observed in the middle frequency band (p=0.018). Conclusions: This study shows that MMG as non-invasive tool has the ability to detect and characterize changes of LAM activity with amplitude and spectral parameters during pregnancy and postpartum.

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Reliability of different electromyographic normalization methods for pelvic floor muscles assessment

Cited by 9 publications

References 24 publications

The Effects of the Biceps Brachii and Brachioradialis on Elbow Flexor Muscle Strength and Spasticity in Stroke Patients

The Effects of the Biceps Brachii and Brachioradialis on Elbow Flexor Muscle Strength and Spasticity in Stroke Patients

Mini-Trampoline Jumping as an Exercise Intervention for Postmenopausal Women

Evaluation of Pelvic Floor Muscles in Pregnancy and Postpartum With Non-Invasive Magnetomyography

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