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Nahid Tahan, Amir Massoud Arab, Bita Vaseghi and Khosro Khademi


Coactivation of abdominal and pelvic-floor muscles (PFM) is an issue considered by researchers recently. Electromyography (EMG) studies have shown that the abdominal-muscle activity is a normal response to PFM activity, and increase in EMG activity of the PFM concomitant with abdominal-muscle contraction was also reported.


The purpose of this study was to compare the changes in EMG activity of the deep abdominal muscles during abdominal-muscle contraction (abdominal hollowing and bracing) with and without concomitant PFM contraction in healthy and low-back-pain (LBP) subjects.


A 2 × 2 repeated-measures design.




30 subjects (15 with LBP, 15 without LBP).

Main Outcome Measures:

Peak rectified EMG of abdominal muscles.


No difference in EMG of abdominal muscles with and without concomitant PFM contraction in abdominal hollowing (P = .84) and abdominal bracing (P = .53). No difference in EMG signal of abdominal muscles with and without PFM contraction between LBP and healthy subjects in both abdominal hollowing (P = .88) and abdominal bracing (P = .98) maneuvers.


Adding PFM contraction had no significant effect on abdominal-muscle contraction in subjects with and without LBP.

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Victor Liberi and Karen H. Liberi

Edited by Lindsey E. Eberman

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Deise J.A. Faleiro, Enaiane C. Menezes, Eduardo Capeletto, Felipe Fank, Rafaela M. Porto and Giovana Z. Mazo

combining abdominal and pelvic movements (e.g., squats) were more likely to cause urine leakage. Regarding exercise and pelvic floor structure, Nygaard, Shaw, Bardsley, and Egger ( 2015 ), in a study on women aged 39–65 years, reported that strenuous exercise during adolescence can affect the pelvic floor

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Ronald F. Zernicke, Grant C. Goulet, Peter R. Cavanagh, Benno M. Nigg, James A. Ashton-Miller, Heather A. McKay and Ton van den Bogert

As a field, biomechanics comprises research from the molecular and cellular levels, to tissues, to organs, to organisms and their movements. In the past 50 years, the impact of biomechanics research on society has been amplified dramatically. Here, we provide five brief summaries of exemplar biomechanics results that have had substantial impact on health and our society, namely 1) spaceflight and microgravitational effects on musculoskeletal health; 2) impact forces, soft tissue vibrations, and skeletal muscle tuning affecting human locomotion; 3) childbirth mechanics, injuries, and pelvic floor dysfunction; 4) prescriptive physical activity in childhood to enhance skeletal growth and development to prevent osteoporotic fractures in adulthood and aging; and 5) creative innovations in technology that have transformed the visual arts and entertainment.

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Han-Kyu Park, Dong-Woo Kim and Tae-Ho Kim

findings showed that respiration training stimulates the diaphragm and helps the abdominal muscles to mobilize, increasing the ventilation rate. The increase in intra-abdominal pressure that occurs at this time caused co-contraction of the diaphragm, pelvic floor muscles, abdominal muscles, and muscles

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Fatemeh Ehsani, Rozita Hedayati, Rasool Bagheri and Shapour Jaberzadeh

each group were also blinded to the group’s intervention. Table 1 Exercise Programs in SE and GE Groups Time SE group GE group First week Isolated TrA, MF, and pelvic floor muscles contraction during AH in prone position Trunk curl up Back extension in prone position Second week Isolated TrA, MF, and

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Blanca de la Cruz Torres

radiculopathy, 23 evaluation of chronic hemiparetic muscles in patients with central nervous system injury, 24 diagnosis of pelvic floor dysfunction, 25 analysis of the common fibular nerve in subjects with functional ankle instability, 26 and diagnosis of cervicogenic periarthritis of shoulder from pure

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Hannah Horris, Barton E. Anderson, R. Curtis Bay and Kellie C. Huxel Bliven

 al . Postural function of the diaphragm in persons with and without chronic low back pain . J Orthop Sports Phys Ther . 2012 ; 42 ( 4 ): 352 – 362 . PubMed ID: 22236541 doi:10.2519/jospt.2012.3830 22236541 10.2519/jospt.2012.3830 6 O’Sullivan PB , Beales DJ . Changes in pelvic floor and diaphragm

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James A. Ashton-Miller and Ronald F. Zernicke

in studying why the elderly fall, a physiatrist interested me in diabetic falls, a chance meeting over a cadaver with a gynecologist led to my getting interested in women’s health and the problem of female pelvic floor injuries due to vaginal birth, and an orthopedist interested me in anterior

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Timothy J. Gibbons and Marie-Louise Bird

CLBP patients . J Electromyogr Kinesiol . 2004 ; 14 : 333 – 342 . doi:10.1016/j.jelekin.2003.07.001 10.1016/j.jelekin.2003.07.001 15094147 15. Critchley D . Instructing pelvic floor contraction facilitates transversus abdominis thickness increase during low-abdominal hollowing . Physiother Res