Kinematic and electromyographic analysis of variations in Nordic hamstring exercise

Autoři: Nejc Šarabon aff001;  Jan Marušič aff001;  Goran Marković aff003;  Žiga Kozinc aff001
Působiště autorů: University of Primorska, Faculty of Health Sciences, Izola, Slovenia aff001;  S2P, Science to practice, Ltd., Laboratory for Motor Control and Motor Behavior, Ljubljana, Slovenia aff002;  University of Zagreb, Faculty of Kinesiology, Zagreb, Croatia aff003;  Motus Melior Ltd., Zagreb, Croatia aff004;  University of Primorska, Andrej Marušič Institute, Koper, Slovenia aff005
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article


The purpose of this study was to present and biomechanically evaluate several variations of the Nordic hamstring exercise (NHE), achieved by altering the slope of the lower leg support and by asumming different hip flexion angles. Electromyographic and 2D kinematic measurements were conducted to analyse muscle activity (biceps femoris, semitendinosus, gluteus maximus, erector spine and lateral head of the gastrocnemius), knee and hip joint torques during 6 variations of NHE. The study involved 18 adults (24.9 ± 3.7 years) with previous experience in resistance training, but with little or no experience with NHE. Increasing the slope of the lower leg support from 0° (standard NHE) to 20° and 40° enabled the participants to perform the exercise through a larger range of motion, while achieving similar peak knee and hip torques. Instructions for increased hip flexion from 0° (standard NHE) to 25°, 50° and 75° resulted in greater peak knee and hip torque, although the participants were not able to maintain the hip angle at 50° nor 75°. Muscle activity decreased or remained similar in all modified variations compared to the standard NHE for all measured muscles. Our results suggest that using the presented variations of NHE might contribute to optimization of hamstring injury prevention and rehabilitation programs, by providing appropriate difficulty for the individual’s strength level and also allow eccentric strengthening at longer hamstring lengths.

Klíčová slova:

Electromyography – Hip – Knee joints – Knees – Legs – Muscle analysis – Strength training – Torque


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2019 Číslo 10
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