論文種別	原著(症例報告除く)
言語種別	英語
査読の有無	その他(不明)
表題	Contributions of Muscle Architecture and Tissue Properties to Knee Extensor Force Production.
掲載誌名	正式名：Journal of strength and conditioning research 略　 称：J Strength Cond Res ISSNコード：15334287/10648011
掲載区分	国外
巻・号・頁	39(12),pp.e1371-e1379
著者・共著者	Tetsuya Hirono, Norihiko Murota, Hiroki Tanaka, Masahide Yagi, Zimin Wang, Hiyu Mukai, Hikari Itsuda, Noriaki Ichihashi
発行年月	2025/12
概要	Hirono, T, Murota, N, Tanaka, H, Yagi, M, Wang, Z, Mukai, H, Itsuda, H, and Ichihashi, N. Contributions of muscle architecture and tissue properties to knee extensor force production. J Strength Cond Res 39(12): e1371-e1379, 2025-Muscular characteristics, such as muscle size, fascicle length and angle, connective tissue within the muscle, and stiffness, are related to muscle force. This study aimed to investigate the contributions of these factors for isometric contraction strength in the quadriceps muscles using multivariate analyses. Maximal voluntary isometric strength of the quadriceps at 3 different knee angles (40, 70, and 100°) in 48 adults (24 men, 23.5 ± 3.0 years) was evaluated. The cross-sectional area (CSA), fascicle length, pennation angle, echo intensity, and shear elastic modulus of the quadriceps were evaluated using ultrasonography. Simple regression analyses revealed that CSA, echo intensity, shear elastic modulus, and fascicle length were significantly related to peak torque and rate of torque development (RTD). The peak torque during isometric contraction was significantly explained by CSA as an independent variable at all knee angles (β = 0.445-0.732), but not by other variables (adjusted R2 = 0.457-0.678). The RTD as a dependent variable was explained by CSA at all angles (β = 0.491-0.702), and by fascicle length at 100° of knee flexion (β = 0.206), but not by other variables (adjusted R2 = 0.371-0.665). These results suggested that maximal isometric contraction strength was determined mainly by muscle CSA, not by other variables.
DOI	10.1519/JSC.0000000000005243
PMID	41186987