2026-06-28T15:11:20Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/733262024-09-13T17:22:09Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Varol, Umut author Navarro Santana, Marcos José author Valera Calero, Juan Antonio author Antón-Ramírez, Sergio author Álvaro-Martínez, Javier author Díaz Arribas, María José author Fernández-de-las-Peñas, César author Plaza Manzano, Gustavo author 2023 Muscle fatigue is defined as a reversible decline in performance after intensive use, which largely recovers after a resting period. Surface electromyography (EMG), ultrasound imaging (US) and dynamometry are used to assess muscle activity, muscle morphology and isometric force capacity. This study aimed to assess the convergent validity between these three methods for assessing muscle fatigue during a manual prehension maximal voluntary isometric contraction (MVIC). A diagnostic accuracy study was conducted, enrolling 50 healthy participants for the measurement of simultaneous changes in muscle thickness, muscle activity and isometric force using EMG, US and a hand dynamometer, respectively, during a 15 s MVIC. An adjustment line and its variance (R2) were calculated. Muscle activity and thickness were comparable between genders (p > 0.05). However, men exhibited lower force holding capacity (p < 0.05). No side-to-side or dominance differences were found for any variable. Significant correlations were found for the EMG slope with US (r = 0.359; p < 0.01) and dynamometry (r = 0.305; p < 0.01) slopes and between dynamometry and US slopes (r = 0.227; p < 0.05). The sample of this study was characterized by comparable muscle activity and muscle thickness change between genders. In addition, fatigue slopes were not associated with demography or anthropometry. Our findings showed fair convergent associations between these methods, providing synergistic muscle fatigue information. 1424-8220 10.3390/s23042030 https://hdl.handle.net/20.500.14352/73326 https://doi.org/10.3390/s23042030 https://www.mdpi.com/1424-8220/23/4/2030 Convergent Validity between Electromyographic Muscle Activity, Ultrasound Muscle Thickness and Dynamometric Force Measurement for Assessing Muscle