A randomized controlled trial: effectiveness of 10-week Nordic Hamstring exercise training and subsequent detraining in healthy young men
Öz
Purpose: Nordic Hamstring Exercise (NHE) is used to increase hamstring muscle strength, prevent injuries. We aimed to reveal the acute, long-term effects of NHE, followed by detraining on demographic measurements, flexibility, anaerobic power, damage, fatigue, oxidative stress, blood lactate levels.
Material and method: A total of 40 sedentary healthy male participated the experiments. 20 of them underwent 10 weeks of progressive NHE followed by detraining. Muscle architecture was determined by ultrasonography, strain ratio by elastography. Anaerobic power was assessed by standing long jump, vertical jump, flexibility by sit reach tests. Creatine kinase activity, oxidant/antioxidant parameters were measured by commercial kits.
Results: NHE allowed subjects to lose weight, which was reversed by detraining of 5 weeks. Exercise caused an increase in knee angles that wasn’t affected by detraining. 10-week NHE caused a partially reversed increase in anaerobic performance upon detraining. NHE resulted in increment of biceps femoris long head area, pennation angle which were reversed by detraining of 10-weeks. Blood lactate, muscle pain, fatigue were increased after each exercise session.
NHE didn’t change oxidative stress but, 5-week detraining resulted in an increase in total oxidant capacity, oxidative stress index. Detraining of 10 weeks caused a reduction of these parameters.
Conclusions: It has been observed that most of the gains obtained with 10-week progressive NHE are reversed with 5-week detraining. These results may guide the selection of the exercise type to increase performance and muscle strength.
Material and method: A total of 40 sedentary healthy male participated the experiments. 20 of them underwent 10 weeks of progressive NHE followed by detraining. Muscle architecture was determined by ultrasonography, strain ratio by elastography. Anaerobic power was assessed by standing long jump, vertical jump, flexibility by sit reach tests. Creatine kinase activity, oxidant/antioxidant parameters were measured by commercial kits.
Results: NHE allowed subjects to lose weight, which was reversed by detraining of 5 weeks. Exercise caused an increase in knee angles that wasn’t affected by detraining. 10-week NHE caused a partially reversed increase in anaerobic performance upon detraining. NHE resulted in increment of biceps femoris long head area, pennation angle which were reversed by detraining of 10-weeks. Blood lactate, muscle pain, fatigue were increased after each exercise session.
NHE didn’t change oxidative stress but, 5-week detraining resulted in an increase in total oxidant capacity, oxidative stress index. Detraining of 10 weeks caused a reduction of these parameters.
Conclusions: It has been observed that most of the gains obtained with 10-week progressive NHE are reversed with 5-week detraining. These results may guide the selection of the exercise type to increase performance and muscle strength.
Anahtar Kelimeler
Nordic hamstring exercise (NHE), detraining, anaerobic power, oxidative stress, creatine kinase
Proje Numarası
2018SABE034
Kaynakça
- 1. Opar DA, Drezner J, Shield A, et al. Acute hamstring strain injury in track-and-field athletes: a 3-year observational study at the Penn Relay Carnival. Scand J Med Sci Sports 2014;24(4): e254-9. https://doi:10.1111/sms.12159
- 2. Shankar PR, Alanlar SK, Collins CL, Dick RW, Comstock RD. Epidemiology of high school and collegiate football injuries in the United States, 2005-2006. Am J Sports Med 2007; 35(8):1295-303. https://doi:10.1177/0363546507299745
- 3. Brooks JH, Fuller CW, Kemp SP, Reddin DB. Incidence, risk, and prevention of hamstring muscle injuries in professional rugby union. Am J Sports Med 2006;34(8):1297-306. https://doi:10.1177/0363546505286022
- 4. Seagrave III RA, Perez L, McQueeney S, Toby EB, Key V, Nelson JD. Preventive effects of eccentric training on acute hamstring muscle injury in Professional baseball. Orthop J Spor Med 2014;2(6):2325967114535351.https://doi:10.1177/2325967114535351
- 5. Orchard J, James T, Kountouris A, PortusM. Changes to injury profile and (recommended cricket injury definitions) based on the increased frequency of Twenty 20 cricket matches. Open Access J Sports Med 2010;1:63– 76.https://doi:10.2147/oajsm.s9671
- 6. Al Attar WSA, Soomro N, Sinclair PJ, Pappas E, Sanders RH. Effect of Injury prevention Programs that Include the Nordic hamstring exercise on hamstring injury rates in soccer players: A systematic review and meta-analysis. Sports Med 2017;47(5):907-916.https://doi:10.1007/s40279-016-0638-2
- 7. Cuthbert M, Ripley N, McMahon JJ, Evans M, Haff GG, Comfort P. The effect of Nordic hamstring exercise intervention volume on eccentric strength and muscle architecture adaptations: A systematic review and meta-analyses. Sport Med 2020;50(1):83–99.https://doi:10.1007/s40279-019-01178-7
- 8. Mjolsnes R, Arnason A, Osthagen T, Raastad T, Bahr R. A 10-week randomized trial comparing eccentric vs. concentric hamstring strength training in well-trained soccer players. Scand J Med Sci Sports 2004;14(5):311-17.https://doi:10.1046/j.1600-0838.2003.367
- 9. Higbie EJ, Cureton KJ, Warren GL 3rd, Prior BM. Effects of concentric and eccentric training on muscle strength, cross-sectional area, and neural activation. J Appl Physiol (1985) 1996;81(5):2173-81.https://doi:10.1152/jappl.1996.81.5.2173
- 10. Timmins RG, Shield AJ, Williams MD, Lorenzen C, Opar DA. Architectural adaptation of muscleto training and injury: a narrative review outlining the contributions by fascicle length, pennation angle and muscle thickness. Br J Sports Med 2016;50(23):1467-1472.https://doi:10.1136/bjsports-2015-094881
