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Abstract #0973

Time-resolved 3D-PC MRI measurements of the upper leg muscles during dynamic knee flexion: the effect of the fatigue threshold

Luuk Vos1, Susanne S. Rauh2, Hermien E Kan2, Aart J. Nederveen3, Gustav J. Strijkers1, and Melissa T Hooijmans3,4
1Biomedical Engineering and Physiscs, Amsterdam UMC, Amsterdam, Netherlands, 2C.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, Leiden, Netherlands, 3Department of Radiology & Nuclear Medicine, Amsterdam UMC, Amsterdam, Netherlands, 4Faculty of Behavioural and Movement Sciences, Vrije Uinversiteit, Amsterdam, Netherlands

Synopsis

Keywords: Muscle, Muscle

Motivation: Dynamic phase-contrast (PC) MRI is used to characterize muscle contractions using a small FOV across various percentages of maximal contractile-force (MCF). However, whole muscle evaluations requires multiple motion cycles, increasing the risk of fatigue, especially at high MCF.

Goal(s): The goal of this study is to investigate the impact of exercising above and below the fatigue threshold (FT) on the whole-muscle 3D PC-MRI velocity data.

Approach: Two dynamic 3D PC-MRI data acquisitions were performed at 90% FT and 110% FT.

Results: FT was at 30% of the MCF. Magnitude and temporal patterns of the FH velocity were not different between conditions and muscles.

Impact: Exercising slightly above the fatigue threshold does not impact 3D PC-MRI derived FH velocity data for the hamstring muscles compared to below-threshold levels, suggesting that muscle fatigue may have limited effect. However, further analysis of strain-rate and strain are required.

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