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  • Title: The effects of neuromuscular electrical stimulation at different frequencies on the activations of deep abdominal stabilizing muscles.
    Author: Cho HK, Jung GS, Kim EH, Cho YW, Kim SW, Ahn SH.
    Journal: J Back Musculoskelet Rehabil; 2016; 29(1):183-9. PubMed ID: 26444328.
    Abstract:
    BACKGROUD: Low back pain is associated with transversus abdominis (TrA) dysfunction. Recently, it was proposed that Neuromuscular Electrical Stimulation (NMES) could be used to stimulate deep abdominal muscle contractions and improve lumbopelvic stability. OBJECTIVE: The purpose of this study was to determine the optimal stimulation frequency required during NMES for the activation of deep abdominal muscles. METHODS: Twenty healthy volunteers between the ages of 24 and 32 were included. The portable research-stimulator was applied using a 10 second contraction time, and a 10 second resting time at 20 Hz, 50 Hz, and 80 Hz. Changes in muscle thicknesses were determined for the TrA, obliquus internus (OI), and obliquus externus (OE) by real time ultrasound imaging. RESULTS: Significant thickness increases in the TrA, OI, and OE were observed during NMES versus the resting state (p < 0.05). Of the frequencies examined, 50 Hz NMES produced the greatest increase in TrA thickness (1.33 fold as compared with 1.22 fold at 20 Hz and 1.21 fold at 80 Hz) (p < 0.05). CONCLUSIONS: Our results indicate that NMES can preferentially stimulate contractions in deep abdominal stabilizing muscles. Most importantly, 50 Hz NMES produced greater muscle thickness increases than 20 or 80 Hz.
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