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  • Title: Electromyographic study of the anterolateral abdominal wall muscles during ejaculation.
    Author: Shafik A, Shafik IA, El Sibai O, Shafik AA.
    Journal: J Sex Med; 2007 Jul; 4(4 Pt 1):1022-7. PubMed ID: 17419819.
    Abstract:
    INTRODUCTION: The anterolateral abdominal wall muscles (AAWMs) are composed of the external and internal oblique, transversus abdominis, and the rectus abdominis muscles. AIM: We investigated the hypothesis that the AAWMs contract reflexly during ejaculation. METHODS: Effect of coitus on AAWMs was tested in 16 healthy men (mean age 37.2 +/- 9.7 years). The intra-abdominal pressure was measured by a manometric catheter introduced into the rectum. The response of the AAWMs to erection and ejaculation was recorded before and after penile and AAWMs' anesthetization by a needle electrode inserted into each of the muscles. MAIN OUTCOME MEASURES: Electromyographic (EMG) activity of AAWMs and rectal pressure increased at ejaculation. RESULTS: A few seconds before and during ejaculation, the rectal pressure and motor unit action potentials (EMG activity) of each of the AAWMs increased; this effect was abolished by anesthetization of the penis and AAWMs. CONCLUSION: Increased AAWMs' EMG denotes contraction of the said muscles. AAWMs' contraction at ejaculation, the resulting increase of the intra-abdominal pressure, and the presumably increased pelvic venous congestion seem to augment the penile venous congestion and rigidity. This effect is suggested to be mediated through a reflex which we call "ejaculation-abdominal wall reflex."
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