Simultaneous Recording and Analysis of Uterine and Abdominal Muscle Electromyographic Activity in Nulliparous Women During Labor

Abstract Background and Purpose. Controversy exists around exercises and clinical tests that attempt to differentially activate the upper or lower portions of the rectus abdominis muscle. The purpose of this study was to assess the activation of the upper and lower portions of the rectus abdominis muscle during a variety of abdominal muscle contractions. Subjects. Subjects (N=11) were selected from a university population for athletic ability and low subcutaneous fat to optimize electromyographic (EMG) signal collection. Methods. Controlling for spine curvature, range of motion, and posture (and, therefore, muscle length), EMG activity of the external oblique muscle and upper and lower portions of rectus abdominis muscle was measured during the isometric portion of curl-ups, abdominal muscle lifts, leg raises, and restricted or attempted leg raises and curl-ups. A one-way repeated-measures analysis of variance was used to test for differences in activity between exercises in the external oblique and rectus abdominis muscles as well as between the portions of the rectus abdominis muscle. Results. No differences in muscle activity were found between the upper and lower portions of the rectus abdominis muscle within and between exercises. External oblique muscle activity, however, showed differences between exercises. Discussion and Conclusion. Normalizing the EMG signal led the authors to believe that the differences between the portions of the rectus abdominis muscle are small and may lack clinical or therapeutic relevance.

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The effects of ropivacaine 0.0625% and levobupivacaine 0.0625% on uterine and abdominal muscle electromyographic activity during the second stage of labor

Minerva Anestesiologica ◽

10.23736/s0375-9393.19.13246-4 ◽

2019 ◽

Vol 85 (8) ◽

Cited By ~ 1

Author(s):

Baisong Zhao ◽

Xueya Qian ◽

Qingning Wang ◽

Xinxu Ou ◽

Baohua Lin ◽

...

Keyword(s):

Abdominal Muscle ◽

Electromyographic Activity ◽

Second Stage Of Labor ◽

Second Stage

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Exercise-induced abdominal muscle fatigue in healthy humans

Journal of Applied Physiology ◽

10.1152/japplphysiol.01389.2005 ◽

2006 ◽

Vol 100 (5) ◽

pp. 1554-1562 ◽

Cited By ~ 46

Author(s):

Bryan J. Taylor ◽

Stephen C. How ◽

Lee M. Romer

Keyword(s):

Peak Oxygen Uptake ◽

Abdominal Muscle ◽

Rectus Abdominis ◽

Voluntary Activation ◽

Abdominal Muscles ◽

Electromyographic Activity ◽

Membrane Excitability ◽

Healthy Humans ◽

Gastric Pressure ◽

Exercise Induced

The abdominal muscles have been shown to fatigue in response to voluntary isocapnic hyperpnea using direct nerve stimulation techniques. We investigated whether the abdominal muscles fatigue in response to dynamic lower limb exercise using such techniques. Eleven male subjects [peak oxygen uptake (V̇o2 peak) = 50.0 ± 1.9 (SE) ml·kg−1·min−1] cycled at >90% V̇o2 peak to exhaustion (14.2 ± 4.2 min). Abdominal muscle function was assessed before and up to 30 min after exercise by measuring the changes in gastric pressure (Pga) after the nerve roots supplying the abdominal muscles were magnetically stimulated at 1–25 Hz. Immediately after exercise there was a decrease in Pga at all stimulation frequencies (mean −25 ± 4%; P < 0.001) that persisted up to 30 min postexercise (−12 ± 4%; P = 0.001). These reductions were unlikely due to changes in membrane excitability because amplitude, duration, and area of the rectus abdominis M wave were unaffected. Declines in the Pga response to maximal voluntary expiratory efforts occurred after exercise (158 ± 13 before vs. 145 ± 10 cmH2O after exercise; P = 0.005). Voluntary activation, assessed using twitch interpolation, did not change (67 ± 6 before vs. 64 ± 2% after exercise; P = 0.20), and electromyographic activity of the rectus abdominis and external oblique increased during these volitional maneuvers. These data provide new evidence that the abdominal muscles fatigue after sustained, high-intensity exercise and that the fatigue is primarily due to peripheral mechanisms.

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Utilising Synergism Between the Transverse Abdominal and Pelvic Floor Muscles at Different Postures in Nulliparous Women: a Randomized Case Control Study

10.21203/rs.3.rs-153944/v1 ◽

2021 ◽

Author(s):

Tímea Molnár ◽

Andrea Domján ◽

Mónika Szűcs ◽

Andrea Surányi ◽

József Bódis

Keyword(s):

Pelvic Floor ◽

Pelvic Floor Muscle ◽

Abdominal Muscle ◽

Pelvic Floor Muscles ◽

The Body ◽

Rank Test ◽

Urinary Leakage ◽

Nulliparous Women ◽

Dynamic Endurance ◽

And Control

Abstract Background: To determine the effects of the pelvic floor muscle training (PFM-T) in combination with transverse abdominal muscle (TRA) activation (cPFM-T) in female urinary incontinence.Methods: We enrolled nulliparous women in supine (SUG) (n = 22), sitting (SIG) (n = 19) and control (COG) (n = 14) groups. We performed the 8-week cPFM-T programme. We examined the effect of training on the parameters with the Kruskal–Wallis test, and the pairwise comparisons with the Mann-Whitney U-test and the Wilcoxon-rank test with the Bonferroni correction.Results: Before training, 15 participants reported occasional urinary leakage. After cPFM-T seven participants reported that urinary leakage had disappeared. Maximal isometric contraction of the pelvic floor muscles (PFM) until fatigue improved significantly in the SUG (p < 0.001) and SIG (p = 0.015) and not significantly in the COG (p = 0.499). Holding time increased in the SUG (p = 0.972) and the SIG (p = 0.717), and decreased in the COG (p = 0.132). The dynamic endurance of the PFM improved significantly in the SUG (p < 0.001), but not in the SIG (p = 0.798) and the COG (p = 0.153). The number of maximal fast contractions within 1 minute increased in both the SUG (p < 0.001) and the SIG (p=0.813) and decreased in the COG (p = 0.257). Relaxation improved significantly in the SIG (p = 0.011). TRA thickness increased in both training groups.Conclusions: Slow-twitch fibres of the PFM can be trained effectively with PFM-T in both the body positions.Trial registration: This study was registered in the Hungarian National Healthcare Service Center: 019234/2014/OTIG Registered 07 April 2014 modification: 096623-002/2015/OTIG Registered 11 November 2015 https://www.aeek.huThe study was retrospectively registered in ClincalTrials.gov NCT04577872 Registered 22 September 2020. https:// https://clinicaltrials.gov

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Uterine and Abdominal Muscle Electromyographic Activities in Control and PCEA-Treated Nulliparous Women During the Second Stage of Labor

Reproductive Sciences ◽

10.1177/1933719116682875 ◽

2016 ◽

Vol 24 (8) ◽

pp. 1214-1220 ◽

Cited By ~ 3

Author(s):

Xueya Qian ◽

Pin Li ◽

Shao-Qing Shi ◽

Robert E. Garfield ◽

Huishu Liu

Keyword(s):

Abdominal Muscle ◽

Second Stage Of Labor ◽

Second Stage ◽

Nulliparous Women

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Abdominal muscles activity during abdominal bracing and posterior pelvic tilt in women after natural birth and after caesarean delivery

Acta of Bioengineering and Biomechanics ◽

10.37190/abb-01706-2020-05 ◽

2020 ◽

Vol 22 (4) ◽

Author(s):

Natalia Kuciel ◽

Justyna Mazurek ◽

Karolina Biernat ◽

Łukasz Pawik ◽

Edyta Sutkowska

Keyword(s):

Muscle Activity ◽

Pelvic Tilt ◽

Abdominal Muscle ◽

Rectus Abdominis ◽

Transversus Abdominis ◽

Abdominal Muscles ◽

Electromyographic Activity ◽

Locomotor System ◽

Natural Birth ◽

Functional Examination

Purpose: Exercises after pregnancy can reduce the severity and risk of postnatal locomotor system disorders and muscular dysfunctions. The aim of the study was to evaluate electromyographic activity of abdominal muscles in women who gave birth naturally and via a caesarean section, and to compare it to a group of women who have never given birth. Methods: 27 women were included into the study after completing the personal questionnaire and functional examination. The surface electromyography during abdominal bracing and posterior pelvic tilt was used to test rectus abdominis muscles and internus oblique/ transversus abdominis muscles bilaterally. After normalization test, patients were asked to perform abdominal bracing and posterior pelvic tilt exercises. Results: Activity of rectus abdominis muscle is higher in posterior pelvic tilt compared to abdominal bracing. It should be noted that the internus oblique/transversus abdominis muscle activity in both exercises is similar. Conclusions: In women after natural birth and after a cesarean section who experienced no locomotor system symptoms, no statistically significant differences in abdominal muscle activity in both exercises were observed. In each group being studied, posterior pelvic tilt activated rectus abdominis muscles to a greater extent than just bracing.

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Abdominal muscle activity during CO2 rebreathing in sleeping neonates

Journal of Applied Physiology ◽

10.1152/jappl.1991.70.3.1344 ◽

1991 ◽

Vol 70 (3) ◽

pp. 1344-1350 ◽

Cited By ~ 27

Author(s):

J. P. Praud ◽

L. Egreteau ◽

M. Benlabed ◽

L. Curzi-Dascalova ◽

H. Nedelcoux ◽

...

Keyword(s):

Premature Infants ◽

Rem Sleep ◽

Nrem Sleep ◽

Abdominal Muscle ◽

Full Term ◽

Sleep Stages ◽

Abdominal Muscles ◽

Electromyographic Activity ◽

Muscle Response ◽

Co2 Rebreathing

Comparison of the abdominal muscle response to CO2 rebreathing in rapid-eye-movement (REM) and non-REM (NREM) sleep was performed in healthy premature infants near full term. Eight subjects were studied at a postconceptional age of 40 +/- 1.6 (SD) wk (range 38-43 wk) during spontaneous sleep. Sleep stages were defined on the basis of electrophysiological and behavioral criteria, and diaphragmatic and abdominal muscle electromyographic activity was recorded by cutaneous electrodes. The responses to CO2 were measured by a modified Read rebreathing technique. The minute ventilation and diaphragmatic and abdominal muscle electromyographic activities were calculated and plotted against end-tidal CO2 partial pressure. Both the ventilatory and diaphragmatic muscle responses to CO2 decreased from NREM to REM sleep (P less than 0.05). Abdominal muscles were forcefully recruited in response to CO2 rebreathing during NREM sleep. In REM sleep, abdominal muscle response to CO2 was virtually absent or decreased compared with NREM sleep (P less than 0.05). We conclude that 1) the abdominal muscles are recruited during NREM sleep in response to CO2 rebreathing in healthy premature infants near full term and 2) the abdominal muscle recruitment is inhibited during REM sleep compared with NREM sleep, and this REM sleep-related inhibition probably contributes to the decrease in the ventilatory response to CO2 rebreathing in REM sleep.

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Ultrasound Assessment of Abdominal Muscle Thickness in Postpartum vs Nulliparous Women

Journal of Manipulative and Physiological Therapeutics ◽

10.1016/j.jmpt.2015.06.005 ◽

2015 ◽

Vol 38 (5) ◽

pp. 352-357 ◽

Cited By ~ 7

Author(s):

Carol Ann Weis ◽

John J. Triano ◽

Jon Barrett ◽

Michelle D. Campbell ◽

Martine Croy ◽

...

Keyword(s):

Muscle Thickness ◽

Abdominal Muscle ◽

Nulliparous Women ◽

Ultrasound Assessment

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Respiratory muscle activity in relation to vocalization in flying bats.

Journal of Experimental Biology ◽

10.1242/jeb.198.1.175 ◽

1995 ◽

Vol 198 (1) ◽

pp. 175-191 ◽

Cited By ~ 6

Author(s):

W C Lancaster ◽

O W Henson ◽

A W Keating

Keyword(s):

Abdominal Wall ◽

Muscle Activity ◽

Abdominal Cavity ◽

Low Frequency ◽

Abdominal Muscle ◽

Electromyographic Activity ◽

Lateral Abdominal Wall ◽

Pteronotus Parnellii ◽

Primary Power ◽

Flight Muscles

The structure of the thoracic and abdominal walls of Pteronotus parnellii (Microchiroptera: Mormoopidae) was described with respect to their function in respiration and vocalization. We monitored electromyographic activity of respiratory and flight muscles in relation to echolocative vocalization. In flight, signals were telemetered with a small FM transmitter modified to summate the low-frequency myopotentials with biosonar signals from a ceramic-crystal microphone. Recordings were also made from the same bats confined to a small cage. Vocalizations were used as the parameter by which all muscle activities were correlated. A discrete burst of activity in the lateral abdominal wall muscles accompanied each vocalization. Diaphragmatic myopotentials occurred between groups of calls and did not coincide with activity of the abdominal wall or with vocalizations. Flight muscles were not active in resting bats. During flight, vocalizations and the abdominal muscle activity that accompanied them coincided with myopotentials of the pectoralis and serratus ventralis muscles. We propose that contractions of the lateral abdominal wall provide the primary power for the production of intense biosonar vocalization in flying and in stationary bats. In flight, synchronization of vocalization with activity of the pectoralis and serratus ventralis jointly contribute to the pressurization of the thoraco-abdominal cavity. This utilization of pressure that is normally generated in flight facilitates respiration and allows for the production of intense vocalizations with little additional energetic expenditure.

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