This study examined the muscle activation of the razor curl functional hamstring exercise (the razor curl has the total body extended and then requires the hips and knees to flex to 90 degrees simultaneously with full contraction of the hamstrings to further the knee flexion) to the traditional prone hamstring curl. Eight healthy, female intercollegiate athletes participated (mean age 20.8 +/- 3.9 y; mean height, 177.8 +/- 10.9 cm; mean weight, 67.3 +/- 9.9 kg). Electromyographic (EMG) data were collected on the following muscles: medial hamstring (semimembranosus and semitendinosus), biceps femoris, gluteus medius, and gluteus maximus while participants performed the 2 exercises: razor curl and the traditional prone curl. Results revealed no significant differences between muscle activations during the 2 exercises (p
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Eccentric force and electromyogram comparison between the eccentric phase of the Nordic hamstring exercise and the razor hamstring curl.
PLoS One
December 2023
Faculty of Rehabilitation Sciences, Nishi Kyushu University, Saga, Japan.
Purpose: Nordic hamstring exercise (NHE) and razor hamstring curl (RHC) are usually performed to train hamstring eccentric contraction strength. However, it is unclear whether there are differences in the intensity of the two methods and the amount of loading on each muscle. Therefore, this study was conducted using peak eccentric force and each muscle surface electromyogram (s-EMG) to provide useful information to decide whether NHE or RHC should be prescribed for training and rehabilitation.
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Razor hamstring curl and Nordic hamstring exercise architectural adaptations: Impact of exercise selection and intensity.
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School of Behavioural and Health Sciences, Australian Catholic University, Melbourne, Victoria, Australia.
Objectives: To investigate knee flexor strength and biceps femoris long head (BFlh) architectural adaptations following two different Nordic hamstring exercise (NHE) interventions and one razor hamstring curl (RHC) intervention.
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L'Oréal Research and Innovation, Aulnay-Sous-Bois, France. Electronic address:
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View Article and Find Full Text PDFMuscle activation of the torso during the modified razor curl hamstring exercise.
Int J Sports Phys Ther
February 2012
Purpose/background: The RAZOR curl has been introduced as a hamstring exercise. However, modifications to the exercise have been developed which are proposed to utilize some of the muscles of the lumbo-pelvic-hip complex. Thus, it was the purpose of this study to quantitatively examine the modified RAZOR curl using surface electromyography (sEMG), as an exercise that may recruit the trunk muscles of the lumbo-pelvic-hip complex.
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