Impact of the Nordic hamstring and hip extension exercises on hamstring architecture and morphology: Implications for injury prevention
Bourne, Matthew N., Duhig, Steven, Timmins, Ryan, Williams, Morgan, Opar, David A., Al Najjar, Aiman, Kerr, Graham K., & Shield, Anthony (2016) Impact of the Nordic hamstring and hip extension exercises on hamstring architecture and morphology: Implications for injury prevention. British Journal of Sports Medicine. (In Press)
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The architectural and morphological adaptations of the hamstrings in response to training with different exercises have not been explored.
- To evaluate changes in biceps femoris long head (BFLH) fascicle length and hamstring muscle size following 10-weeks of Nordic hamstring exercise (NHE) or hip extension (HE) training.
- Thirty recreationally active male athletes (age, 22.0 ± 3.6 years, height, 180.4 ± 7 cm, weight, 80.8 ± 11.1 kg) were allocated to one of three groups: 1) HE training (n=10), NHE training (n=10), or no training (CON) (n=10). BFLH fascicle length was assessed before, during (Week 5) and after the intervention with 2D-ultrasound. Hamstring muscle size was determined before and after training via magnetic resonance imaging.
- Compared to baseline, BFLH fascicles were lengthened in the NHE and HE groups at mid- (d = 1.12 – 1.39, p < 0.001) and post-training (d = 1.77 – 2.17, p < 0.001) but remained unchanged for the CON group (d = 0.20 – 0.31, p > 0.05). BFLH volume increased more for the HE than the NHE (d = 1.03, p = 0.037) and CON (d = 2.24, p < 0.001) groups. Compared to the CON group, both exercises induced significant increases in semitendinosus volume (d = 2.16 – 2.50, ≤ 0.002), however, only the HE group displayed increased semimembranosus volume (d= 1.57, p = 0.007).
- NHE and HE training both stimulate significant increases in BFLH fascicle length, however, HE training may be more effective for promoting hypertrophy in the BFLH and semimembranosus than the NHE.
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|Item Type:||Journal Article|
|Keywords:||Hamstring strain injury|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > HUMAN MOVEMENT AND SPORTS SCIENCE (110600) > Sports Medicine (110604)|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Exercise & Nutrition Sciences
|Copyright Owner:||Copyright 2016 B M J Group|
|Deposited On:||29 Aug 2016 00:43|
|Last Modified:||01 Dec 2016 09:45|
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