Differences in the Electromyographic Activity of the Hamstring, Gluteus Maximus, and Erector Spinae Muscles in a Variety of Kinetic Changes

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Date: Dec. 2018
Publisher: National Strength and Conditioning Association
Document Type: Author abstract; Report
Length: 303 words

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Byline: Norikazu Hirose, Faculty of Sport Sciences, Waseda University, Tokyo, Japan; Masaaki Tsuruike, Department of Kinesiology, San Jose State University, San Jose, California Abstract Hirose, N and Tsuruike, M. Differences in the electromyographic activity of the hamstring, gluteus maximus, and erector spinae muscles in a variety of kinetic changes. J Strength Cond Res 32(12): 3366-3372, 2018-This study aimed to clarify the differences in the electromyographic (EMG) activity of the semitendinosus (ST), semimembranosus (SM), biceps femoris long head (BFl), gluteus maximus (GM), and erector spinae (ES) muscles during leg curl and bridge exercises across different knee angles and isometric contraction outputs. Sixteen male volunteers participated in this study. The EMG of all targeted muscles was measured at 20 and 40% of the maximal voluntary isometric contraction (MVIC) in the leg curl and during bilateral and unilateral bridge exercises. The knee flexion angle was randomly set at 30, 60, 90, and 120[degrees] during each of the exercises. The obtained data were normalized by the MVIC of the corresponding muscle, and each of the normalized values was compared with that of the ST. The EMG activity of the ST was significantly greater at 120[degrees] of knee flexion than that of 30 and 60[degrees] of knee flexion during leg curl regardless of intensity (p

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Gale Document Number: GALE|A563499987