Impact of the Nordic hamstring and hip extension exercises on hamstring architecture and morphology: implications for injury prevention.
Br J Sports Med
; 51(5): 469-477, 2017 Mar.
Article
in En
| MEDLINE
| ID: mdl-27660368
ABSTRACT
BACKGROUND:
The architectural and morphological adaptations of the hamstrings in response to training with different exercises have not been explored.PURPOSE:
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.METHODS:
30 recreationally active male athletes (age, 22.0±3.6â years; height, 180.4±7â cm; weight, 80.8±11.1â kg) were allocated to 1 of 3 groups (1) HE training (n=10), NHE training (n=10), or no training (control, CON) (n=10). BFLH fascicle length was assessed before, during (Week 5) and after the intervention with a two-dimensional ultrasound. Hamstring muscle size was determined before and after training via MRI.RESULTS:
Compared with baseline, BFLH fascicles were lengthened in the NHE and HE groups at mid-training (d=1.12-1.39, p<0.001) and post-training (d=1.77-2.17, p<0.001) and these changes did not differ significantly between exercises (d=0.49-0.80, p=0.279-0.976). 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 with the CON group, both exercises induced significant increases in semitendinosus volume (d=2.16-2.50, ≤0.002) and these increases were not significantly different (d=0.69, p=0.239).CONCLUSION:
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.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Athletic Injuries
/
Muscle Stretching Exercises
/
Hamstring Muscles
Type of study:
Clinical_trials
/
Diagnostic_studies
/
Observational_studies
Limits:
Adult
/
Humans
/
Male
Language:
En
Journal:
Br J Sports Med
Year:
2017
Type:
Article
Affiliation country:
Australia