Electromyographic Examination of Hip and Knee Extension Hex Bar Exercises Varied by Starting Knee and Torso Angles
Variations of the deadlift can be executed using the hexagonal (hex) bar by altering, for instance, the knee and torso angles while maintaining a constant hip angle at the start position. PURPOSE: To examine muscle activation patterns of the biceps femoris, rectus femoris, and erector spinae during three deadlift variations using the hex bar. METHODS: Twenty resistance-trained male and female subjects performed hex bar deadlift variations in three different starting knee flexion positions: 128.4 ± 8.5° (elevated Romanian Deadlift), 111.9 ± 8.7° (conventional elevated deadlift), and 98.3 ± 6.5° (conventional hexagonal bar deadlift). Subjects performed three repetitions at 75% of their three-repetition maximum. Electromyography sensors were placed on the dominant biceps femoris, rectus femoris, and lumbar erector spinae. A one-way repeated measures ANOVA was used to detect differences in mean and peak EMG values normalized to maximum voluntary isometric contraction (MVIC) (pRESULTS: As knee flexion increased at the starting position, mean activation of the rectus femoris increased (24.7±21.5 to 35.5±25.4 to 62.1±31.3% MVIC, pCONCLUSIONS: Practitioners should consider the muscular goals when adjusting the starting position of a hex bar deadlift as posterior chain recruitment diminished and quadriceps activation increased as knee flexion increased.
McCauley, Meghan; Rivera, Jennifer; Leyva, Whitney D.; Tomlinson, Kalin A.; Valenzuela, Kevin A.; Zeitz, Elisabeth; and Jo, Edward Dr.
"Electromyographic Examination of Hip and Knee Extension Hex Bar Exercises Varied by Starting Knee and Torso Angles,"
International Journal of Exercise Science: Conference Proceedings: Vol. 14:
1, Article 38.
Available at: https://digitalcommons.wku.edu/ijesab/vol14/iss1/38
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