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• W4386700623 abstract "To design effective exercise or rehabilitation routines, it is crucial to quantify the mechanics of individual muscles. Surface electromyography (sEMG) has been used in active muscle characterization however, it lacks representative information in passive state. Ultrasound shear wave elastography (SWE) is a non-invasive approach that showed promise in assessing local muscular properties both in active and passive states [1–4]. We investigated the tibialis anterior (TA) muscle, a major dorsiflexor in relation to ankle joint position and function. Specifically, we tested whether SWE reflects the changes in TA muscle due to (i) length changes imposed by the ankle position in a passive state, and (ii) the activity level changes during isometric contractions. Ten healthy volunteers (five females, 26.6 ± 3.9 years old) participated. Simultaneous sEMG and SWE of the TA and ankle torque measurements were performed at -15º dorsiflexion, 0º neutral, and 15º, 30º, and 45º plantar flexion positions during rest, maximum voluntary contractions (MVC) and submaximal isometric ramp contractions (25%, 50%, and 75% MVC). Muscle lengths were measured at each ankle angle using B-mode ultrasound. TA length changed with the ankle angle (p<0.001), with differences between -15º and 30º (p=0.047) / 45º (p=0.002) ankle angles. TA length increase caused passive ankle torque to increase from -9.4 ± 2.3 Nm at -15º to 2.6 ± 4.7 Nm at 45º (Figure). Passive shear elastic modulus increased at plantar flexion, with significant differences between -15º/0º/15º/45º vs 30º (18.7 ± 4.1 kPa); and -15º/0º/15º/30º vs 45º (28.9 ± 8.4 kPa) ankle angles (Figure). MVC torque was maximum at 15º (51.5 ± 12.9 Nm) and decreased with ankle angle (p=0.003). For submaximal isometric ramp contractions, sEMG amplitude normalized to its MVC value changed with activity level (p<0.001 for all) and joint position, with differences between -15º/0º/15º and 30º (p<0.05) / 45º (p<0.001) ankle angles. Active shear elastic modulus changed only with activity level (p<0.001). Figure. (A) Ankle torque and (B) shear elastic modulus of the TA at passive state. * and ** indicate significant differences from the values measured at -15º and 0º ankle angles, respectively (p<0.005 for all pairwise comparisons). + and ++ indicate significant differences from the values measured at 30º (p<0.05) and 45º (p<0.001) ankle angles, respectively.Download : Download high-res image (36KB)Download : Download full-size image We showed that SWE detects length-dependent mechanical properties of TA muscle in passive state. The findings suggest that reflecting the changes in contraction intensity, SWE can be improved to assess in vivo muscle stiffness during activation in the future. Hereby, the combined use of SWE and sEMG can track muscular alterations both in passive and active states due to exercise or pathology." @default.
• W4386700623 created "2023-09-14" @default.
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• W4386700623 date "2023-09-01" @default.
• W4386700623 modified "2023-10-18" @default.
• W4386700623 title "In vivo assessment of tibialis anterior muscle in passive and active states using shear wave elastography" @default.
• W4386700623 doi "https://doi.org/10.1016/j.gaitpost.2023.07.117" @default.
• W4386700623 hasPublicationYear "2023" @default.
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