Related Experiment Video
Updated: May 15, 2026
Muscle Function Obtained with Motion Mode Ultrasound and Surface Electromyography during Core Endurance Exercise
Published on: August 25, 2022
Electromyographic evaluation of abdominal-muscle function with and without concomitant pelvic-floor-muscle
Nahid Tahan1, Amir Massoud Arab, Bita Vaseghi
1Faculty of Rehabilitation Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Context:
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.
Objective:
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.
Design:
A 2 × 2 repeated-measures design.
Setting:
Laboratory.
Participants:
30 subjects (15 with LBP, 15 without LBP).
Main Outcome Measures:
Peak rectified EMG of abdominal muscles.
Results:
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.
Conclusion:
Adding PFM contraction had no significant effect on abdominal-muscle contraction in subjects with and without LBP.
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