RT Journal Article T1 Hamstring muscle architecture and myotonometer measurements in elite professional football players with a prior strained hamstring A1 Núñez Sánchez, Francisco Javier A1 Martinez, Juan Carlos A1 Jan-Arie, Overberg A1 Torreño, Nacho A1 Suárez Moreno-Arrones, Luis Jesús K1 Injury K1 Biceps femoris long head K1 Fascicle length K1 Angle pennation K1 MyotonPRO K1 Soccer AB The purpose of this study was to compare the fascicle length, angle pennation and mechanicalproperties of the biceps femoris long head (BFlh) in dominant and non-dominant limbs in previously injured anduninjured professional football players. Fifteen professional football players were recruited to participate in thisstudy. Seven players had suffered a BFlh injury during the previous season. Myotonometry mechanical propertieswere measured in the proximal, common tendon and distal BFlh using MyotonPRO, and angle pennation andfascicle length were also measured. We observed significantly higher distal BFlh frequency, stiffness, decrement,relaxation and creep than in the common tendon and proximal BFlh. The previously injured players showedsignificantly higher frequency and stiffness, and lower relaxation and creep in the dominant BFlh than did uninjuredplayers. There were no significant differences between the fascicle length and angle pennation in previouslyinjured and uninjured BFlh. Myotonometric measurement provides a quick and inexpensive way to check theproperties of the BFlh in professional football players. Professional football players with previous BFlh injuryshowed higher intrinsic tension and a poorer capacity to deform than did players with no injury to the BFlh. PB ICMJE YR 2022 FD 2022-01-03 LK https://hdl.handle.net/10433/21934 UL https://hdl.handle.net/10433/21934 LA en NO : Núñez JF, Martínez JC, Overberg JA et al. Hamstring muscle architecture and myotonometer measurements in elite professional football players with a prior strained hamstring. Biol Sport. 2023;40(1):93–99 NO Funding: This study was made possible by NPRP grant # NPRP6-1526-3-363 from the Qatar National Research Fund (a memberof Qatar Foundation). The statements made herein are solely theresponsibility of the authors. The funders had no role in study design,data collection and analysis, decision to publish, or preparation ofthe manuscript NO Departamento de Deporte en Informática NO CIRFD Centro de Investigación en Rendimiento Físico y Deportivo DS RIO RD May 9, 2026