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• W2914254277 abstract "In vivo muscle forces are typically estimated using literature-based or subject-specific moment arms (MAs) because it is not possible to measure in vivo muscle forces non-invasively. However, even subject-specific muscle-tendon MAs vary across contraction levels and are impossible to determine at high contraction levels without techniques that use ionized radiation. Therefore, different generic MA functions are often used to estimate in vivo muscle forces, which may alter force predictions and the shape of the muscle’s force-length relationship. The aim of this study was to examine the influence of different literature-based patella tendon MA functions on the vastus lateralis (VL) force-angle relationship. Participants (n = 11) performed maximum voluntary isometric knee extension contractions at six knee flexion angles, ranging from 40° to 90°. To estimate in vivo VL muscle force, the peak knee extension torque at each joint angle was multiplied by the VL’s physiological cross-sectional area (PCSA) relative to the quadriceps’ PCSA (34%) and then divided by the angle-specific patella tendon MA for 19 different functions. Maximum VL force was significantly different across MA functions (p ≤ 0.039) and occurred at different knee flexion angles. The shape of the VL force-angle relationship also differed significantly (p < 0.01) across MA functions. According to the maximum force generated by VL based on its literature-derived PSCA, only the VL force-angle relationships estimated using geometric imaging-based MA functions are feasible across the knee angles studied here. We therefore recommend that an average of these MA functions is calculated to estimate quadriceps muscle forces if subject-specific MAs cannot be determined." @default.
• W2914254277 created "2019-02-21" @default.
• W2914254277 creator A5025770293 @default.
• W2914254277 creator A5055876191 @default.
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• W2914254277 date "2019-03-01" @default.
• W2914254277 modified "2023-10-18" @default.
• W2914254277 title "Patella tendon moment arm function considerations for human vastus lateralis force estimates" @default.
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• W2914254277 doi "https://doi.org/10.1016/j.jbiomech.2019.01.042" @default.
• W2914254277 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30736963" @default.
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