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Updated: Jun 19, 2026

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
Published on: May 1, 2018
Comparison of hamstring and gluteus muscles electromyographic activity while performing the razor curl vs. the
Gretchen D Oliver1, Christopher P Dougherty
1Department of Health, Kinesiology, Recreation, and Dance, University of Arkansas, Fayetteville, Arkansas, USA. goliver@uark.edu
Abstract:
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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