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The effect of initial position in ankle joints on the muscle activity of the quadriceps femoris during reverse Nordic Hamstring Exercise measured using surface electromyography
Ruferová, Zdeňka ; Nováková, Tereza (advisor) ; Lopot, František (referee)
Title: The effect of initial position in ankle joints on the muscle activity of the quadriceps femoris during reverse Nordic Hamstring Exercise measured using surface electromyography Objectives: The aim of this study is to compare the effect of a different initial position of ankle joints on the muscular activity of the m. quadriceps femoris during performing rNHE, which can be recorded by surface electromyography. Methods: Two variants of the initial position of the ankle joint were performed during the rNHE exercise. The first variant was performed with dorsal flexion in the ankle joint and the second variant was performed with plantar flexion of the ankle joint. Overal 33 probands were selected for this research. The selection was intentional due to the nature of the study and it participants represented a healthy population. Each variant of the rNHE was performed 3 times, the duration of one repetition was 3 s, the angular velocity was 30 ř / s. Muscle activity of the rectus femoris, lateral vastus muscle and medial vastus muscle was measured using surface electromyography. Results: The results demonstrate the effect of a change in the initial position of the ankle joint on the muscle activity of the quadriceps femoris muscle during the reverse Nordic Hamstring Exerice. We recorded an...
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EMG study: Nordic hamstring exercises vs. isometric training
Kudláček, Jiří ; Slabý, Kryštof (advisor) ; Pokorný, Jan (referee)
Bibliographical record: KUDLÁČEK, Jiří. EMG study: Nordic hamstring exercises vs. isometric training. Prague: Charles Univerzity, 2nd Faculty of Medicine, Department of Rehabilitation and Sports Medicine, 2020, 79p. Supervisor MUDr. Kryštof Slabý. Abstract This thesis is an EMG study, which examines an electric activity of knee flexors and m. quadriceps femoris during 3 types of exercises: Nordic hamstring exercise, single leg sliding leg curl, and isometric contraction. The theoretical part summarizes anatomy, physiology, and kinesiology of the musculoskeletal system, as well as the principle of surface EMG. In the experimental part, the EMG study was conducted on 20 healthy individuals aged 20 to 30 years-old. Each patient underwent an applied kinesiology procedure and subsequently went through an 16 channel surface EMG technique. The aim of this work is to compare the maximal and average value of the EMG amplitude of particular muscles during each exercise. While providing Nordic hamstring exercise and single leg slide, the light was shed on a question of whether there is a statistically significant difference between activation of m. biceps femoris and m. semitendinosus in terms of EMG values. The following phase of the thesis scrutinized the timing of hamstring muscles during Nordic hamstring...
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