Comparison of Modified RAZOR Curl and Nordic Hamstring Curl Exercises in improving Hamstring Muscle Performance among Male Volleyball Players

  • CK Muralidharan PhD Scholar, Chettinad Academy of Research Education, Tamil Nadu, India.
  • P Senthil Dean IC, School of Physiotherapy, Chettinad Academy of Research and Education, Tamil Nadu, India.
  • T Loganathan HOD, Professor, Nandha College of Physiotherapy, Erode, Tamil Nadu, India.
  • A Gopala Krishnan Assistant Professor, Nandha College of Physiotherapy, Erode, Tamil Nadu, India.
Keywords: Volleyball Player, Modified RAZOR Curl, Nordic Hamstring Curl, Strength, Power, 40-yard Dash Test, One Repetition Maximum


Background: Volleyball players’ lower extremity strength, power, and flexibility are more significant, and hamstrings, in particular, affect their performance. Concentric hamstring performance-enhancing methods are the most common. They may reduce hamstring flexibility and raise the risk of strain. In this study, we focused on enhancing hamstring muscle performance in volleyball players using particular hamstring eccentric training regimens that increase lower extremity performance.
Method: A total of 40 volleyball players were sorted into two groups using a suitable sampling procedure based on inclusion and exclusion criteria. For 12 weeks, Group A (n = 20) received modified RAZOR curl while Group B (n = 20) received Nordic hamstring curl.
Results: The mean values for the 1 Repetition Maximum and 40 Yard Dash Tests were 11.6 and 1.24, respectively, with standard deviations of 1.63 and 0.31, and paired ‘t’ values of 12.86 and 3.26, indicating that Group B (Nordic hamstring curl) showed substantial gains in strength and power. However, Group A (modified RAZOR curl) improved significantly in the Superman Exercise Test from baseline, with a mean of 12.1 and a standard deviation of 1.74. In the 1 Repetition Maximum, 40 Yard Dash Test, and Superman Exercise Test, both groups had unpaired ‘t’ values of 12.86, 3.26, and 16.69.
Conclusion: Both groups improved in strength and power, according to the findings of this study. Although Group B trained volleyball players improved more, modified RAZOR curl (Group A) was more pertinent to be used for functional training and increased activation of supporting muscles, especially the core muscles.

How to cite this article:
Muralidharan CK, Senthil P, Loganathan T, Krishnan AG. Comparison of Modified RAZOR Curl and Nordic Hamstring Curl Exercises in improving Hamstring Muscle Performance among Male Volleyball Players. Chettinad Health City Med J. 2022;54(1):9-15.



Amadio AC, Duarte M. Analysis of human movement based on biomechanics. Kansas: Biomechanics Laboratory; 1996.

Britannica, The Editors of Encyclopaedia [Internet]. Volleyball summary. Encyclopedia Britannica; 2003 [cited 2022 Jan]. Available from:

Higashihara A, Ono T, Kubota J, Fukubayashi T. Differences in the electromyographic activity of the hamstring muscles during maximal eccentric knee flexion. Eur J Appl Physiol. 2010;108(2):355-62.[PubMed] [Google Scholar]

Van Der Horst N, Smits DW, Petersen J, Goedhart EA, Backx FJ. The preventive effect of the nordic hamstring exercise on hamstring injuries in amateur soccer players: a randomized controlled trial. Am J Sports Med. 2015 Jun;43(6):1316-23. [PubMed] [Google Scholar]

Guex K, Millet GP. Conceptual framework for strengthening exercises to prevent hamstring strains. Sports Med. 2013;43(12):1207-15. [PubMed] [Google Scholar]

Brughelli M, Nosaka K, Cronin J. Application of eccentric exercise on an Australian rules football player with recurrent hamstring injuries. Phys Ther Sport. 2009;10(2):75-80. [PubMed] [Google Scholar]

Mendiguchia J, Arcos AL, Garreus MA, Myer GD, Yanchi J, Idoate F. The use of MRI to evaluate posterior thigh muscle activity and damage during Nordic hamstring exercise. J Strength Cond Res. 2013;27(12):3426-35. [PubMed] [Google Scholar]

Petersen J, Holmich P. Evidence-based prevention of hamstring injuries in sport. Br J Sports Med. 2005;39(6):319-23. [PubMed] [Google Scholar]

Oliver GD, Stone AJ, Wyman JW, Blazquez IN. Muscle activation of the torso during the modified razor curl hamstring exercise. Int J Sports Phys Ther. 2012;7(1):49. [PubMed] [Google Scholar]

Oliver GD, Dougherty CP. The razor curl: a functional approach to hamstring training. J Strength Cond Res. 2009;23(2):401-5. [PubMed] [Google Scholar]

Kavcic N, Grenier S, McGill SM. Determining the stabilizing role of individual torso muscles during rehabilitation exercises. Spine (Phila Pa 1976). 2004;29(11):1254-65. [PubMed] [Google Scholar]

Nedunchezhiyan A, Kajamohideen SA, Thiruvenkadam IA, Rajendran K, Lim LS, Nedunchezhiyan A. Comparison of concentric and eccentric hamstring strength training in improving muscle strength and power among Futsal players - a randomized controlled trial. Int J Physiother. 2016;3(6).

Camic CL, Housh TJ, Zuniga JM, Bergstrom HC, Schmidt RJ, Johnson GO. Mechanomyographic and electromyographic responses during fatiguing eccentric muscle actions of the leg extensors. J Appl Biomech. 2014;30(2):255-61. [PubMed] [Google Scholar]

Calmels PM, Nellen M, van der Borne I, Jourdin P, Minaire P. Concentric and eccentric isokinetic assessment of flexor-extensor torque ratios at the hip, knee, and ankle in a sample population of healthy subjects. Arch Phys Med Rehabil. 1997;78(11):1224-30. [PubMed] [Google Scholar]

Clark R, Bryant A, Culgan JP, Hartley B. The effects of eccentric hamstring strength training on dynamic jumping performance and isokinetic strength parameters: a pilot study on the implications for the prevention of hamstring injuries. Phys Ther Sport. 2005;6(2):67-73. [Google Scholar]

Comfort P, Green CM, Matthews M. Training considerations after a hamstring injury in athletes. Strength Cond J. 2009;31(1):68-74. [Google Scholar]

Da Silva EM, Brentano MA, Cadore EL, De Almeida AP, Kruel LF. Analysis of muscle activation during different leg press exercises at submaximal effort levels. J Strength Cond Res. 2008;22(4):1059-65. [PubMed] [Google Scholar]

Daneshjoo A, Mokhtar AH, Rahnama N, Yusof A. The effects of comprehensive warm-up programs on proprioception, static and dynamic balance on male soccer players. PLoS One. 2012;7(12):e51568. [PubMed] [Google Scholar]

Ebben WP, Long NJ, Pawloski ZD, Chimielewski LM, Clewien RW, Jensen RL. Using squat repetition maximum testing to determine hamstring resistance training exercise loads. J Strength Cond Res. 2010;24(2):293-9. [PubMed] [Google Scholar]

Grieco CR, Cortes N, Greska EK, Lucci S, Onate JA. Effects of a combined resistance-plyometric training program on muscular strength, running economy, and VO2 peak in division I female soccer players. J Strength Cond Res. 2012;26(9):2570-6. [PubMed] [Google Scholar]

Worrell TW, Karst G, Adamczyk D, Moore R, Stanley C, Steimel B, Steimel S. Influence of joint position on electromyographic and torque generation during maximal voluntary isometric contractions of the hamstrings and gluteus maximus muscles. J Orthop Sports Phys Ther. 2001;31(12):730-40. [PubMed] [Google Scholar]

McHugh MP, Connolly DA, Eston RG, Gleim GW. Electromyographic analysis of exercise resulting in symptoms of muscle damage. J Sports Sci. 2000;18(3):115-27. [PubMed] [Google Scholar]

Koulouris G, Connell D. Evaluation of the hamstring muscle complex following acute injury. Skeletal Radiol. 2003;32(10):582-9. [PubMed] [Google Scholar]

Konrad P. The ABC of EMG: a practical introduction to kinesiology electromyography. USA: Noraxon Inc; 2005.

Leszczak TJ, Olson JM, Stafford J, Brezzo RD. Early adaptations to eccentric and high-velocity training on strength and functional performance in community dwelling older adults. J Strength Cond Res. 2013;27(2):442-8. [PubMed] [Google Scholar]

Ebben WP, Fauth ML, Petushek EJ, Garceau LR, Hsu BE, Lutsch BN, Feldmann CR. Gender-based analysis of hamstring and quadriceps muscle activation during jump landings and cutting. J Strength Cond Res. 2010;24(2):408-15. [PubMed] [Google Scholar]

Wright GA, Delong TH, Gehlsen G. Electromyography activity of the hamstrings during the performance of the leg curl, stiff-leg deadlift, and back squat movements. J Strength Cond Res. 1999;13(2):168-78. [Google Scholar]

Onishi H, Yagi R, Oyama M, Akasaka K, Ihashi K, Handa Y. EMG-angle relationship of the hamstring muscles during maximum knee flexion. J Electromyogr Kinesiol. 2002;12(5):399-406. [PubMed] [Google Scholar]

Dankaerts W, O’Sullivan PB, Burnett AF, Straker LM, Danneels LA. Reliability of EMG measurements for trunk muscles during maximal and sub-maximal voluntary isometric contractions in healthy controls and CLBP patients. J Electromyogr Kinesiol. 2004;14(3):333-42. [PubMed] [Google Scholar]

McAllister MJ, Hammond KG, Schilling BK, Ferreria LC, Reed JP, Weiss LW. Muscle activation during various hamstring exercises. J Strength Cond Res. 2014;28(6):1573-80. [PubMed] [Google Scholar]

McGill SM. Electromyographic activity of the abdominal and low back musculature during the generation of isometric and dynamic axial trunk torque: implications for lumbar mechanics. J Orthop Res. 1991;9(1):91-103. [PubMed] [Google Scholar]

Sayers AL, Brandi-Eveland S. The Nordic eccentric hamstring exercise for injury prevention in soccer players. Strength Cond J. 2008;30(4):56-8. [Google Scholar]

Brughelli M, Cronin J. Preventing hamstring injuries in sport. Strength Cond J. 2008;30(1):55-64. [Google Scholar]