Biceps femoris long head muscle fascicle length does not differ between sexes

BEHAN, F.P., MOODY, R., PATEL, T.S., LATTIMORE, E., MADEN-WILKINSON, Tom and BALSHAW, T.G. (2019). Biceps femoris long head muscle fascicle length does not differ between sexes. Journal of Sports Sciences, 37 (21), 2452-2458.

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© 2019, © 2019 Informa UK Limited, trading as Taylor &amp; Francis Group. Hamstring strain injury (HSI) rates are higher for males vs. females. This cross-sectional study investigated if inherent differences in biceps femoris long head (BFLH) fascicle length (Lf) exist between recreationally active males and females (i.e., individuals without specific training practice history). Twenty-four young healthy participants (12 males; 12 females) had their BFLH muscle architecture (Lf, pennation angle [θp], and muscle thickness [MT]) measured using B-mode ultrasonography. Eccentric and isometric knee flexion strength were also assessed. BFLH Lf did not differ between sexes when expressed in absolute terms (males, 81.5 ± 14.7 mm; females, 73.6 ± 15.9 mm, P = 0.220, effect size (ES) = 0.52) or relative to femur length (0.140 ≤ P ≤ 0.220, ES = 0.63). Similarly, BFLH θp did not differ between sexes (P = 0.650) but BFLH MT was 18.9% larger for males vs. females (P = 0.024, ES = 0.99). Isometric and eccentric knee flexion strength was greater for males vs. females in absolute terms ([both] P < 0.001, 2.00 ≤ ES ≤ 2.27) and relative to body mass ([both] P < 0.001, 1.93 ≤ ES ≤ 2.13). In conclusion, factors other than BFLH Lf seem likely to be implicated in higher male vs. female HSI rates.

Item Type: Article
Uncontrolled Keywords: Strength; muscle architecture; ultrasound; Strength; muscle architecture; ultrasound; Cross-Sectional Studies; Female; Hamstring Muscles; Humans; Isometric Contraction; Knee; Male; Muscle Strength; Risk Factors; Sex Factors; Ultrasonography; Knee; Humans; Ultrasonography; Risk Factors; Cross-Sectional Studies; Sex Factors; Isometric Contraction; Female; Male; Muscle Strength; Hamstring Muscles; Sport Sciences; 1106 Human Movement and Sports Sciences; 1302 Curriculum and Pedagogy
Identification Number:
Page Range: 2452-2458
SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 28 Apr 2021 16:14
Last Modified: 28 Apr 2021 16:15

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