Background: No study relating the changes obtained in the architecture of erector spinae (ES) muscle were\r\nregistered with ultrasound and different intensities of muscle contraction recorded by surface EMG\r\n(electromyography) on the ES muscle was found. The aim of this study was analyse the relationship in the response\r\nof the ES muscle during isometric moderate and light lumbar isometric extension considering architecture and\r\nfunctional muscle variables.\r\nMethods: Cross-sectional study. 46 subjects (52% men) with a group mean age of 30.4 (Ã?±7.78). The participants\r\ndeveloped isometric lumbar extension while performing moderate and low isometric trunk and hip extension in a\r\nsitting position with hips flexed 90 degrees and the lumbar spine in neutral position. During these measurements,\r\nelectromyography recordings and ultrasound images were taken bilaterally. Bilaterally pennation angle, muscle\r\nthickness, torque and muscle activation were measured. This study was developed at the human movement\r\nanalysis laboratory of the Health Science Faculty of the University of Malaga (Spain).\r\nResults: Strong and moderate correlations were found at moderate and low intensities contraction between the\r\nvariable of the same intensity, with correlation values ranging from 0.726 (Torque Moderate ââ?¬â?? EMG Left Moderate)\r\nto 0.923 (Angle Left Light ââ?¬â?? Angle Right Light) (p < 0.001). This correlation is observed between the variables that\r\ndescribe the same intensity of contraction, showing a poor correlation between variables of different intensities.\r\nConclusion: There is a strong relationship between architecture and function variables of ES muscle when describe\r\nan isometric lumbar extension at light or moderate intensity.
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