The Applicability of Shear Wave Elastography to Assess Myotendinous Stiffness of Lower Limbs during an Incremental Isometric Strength Test.
Autor: Bravo Sánchez, Alfredo; Abián, Pablo; Lucenteforte, Giacomo; Jiménez, Fernando; Abián Vicen, Javier
Resumen: The aim of the study was to describe the applicability of shear wave elastography to assess
muscular and tendinous stiffness of the lower limbs during an incremental isometric strength test
and to differentiate the stiffness evolution between superficial and deep muscle regions. Dominant
rectus femoris and patellar tendons of 30 physically active people (28.3 9.2 years, 173.2 7.7 cm,
76.2 12.6 kg) were measured in different isometric strength conditions (relaxed muscle, and at
10%, 20%, 30%, 40%, 50% and 60% of maximal voluntary contraction (MVC)). The percentage of
success was >85% at all muscle contraction intensities for rectus femoris muscles but only in a relaxed
condition for patellar tendons. Rectus femoris stiffness significantly increased compared to the
relaxed condition from 30% to 60% MVC (p 0.011) in superficial muscle regions, and from 10% to
60% MVC (p 0.002) in deep muscle regions. Deep muscle regions showed higher stiffness values
than superficial muscle regions at 30% MVC (51.46 38.17 vs. 31.83 17.05 kPa; p = 0.019), 40%
MVC (75.21 42.27 vs. 51.25 28.90 kPa; p = 0.018), 50% MCV (85.34 45.05 vs. 61.16 37.03 kPa;
p = 0.034) and 60% MVC (109.29 40.04 vs. 76.67 36.07 kPa; p = 0.002). Rectus femoris stiffness
increased during the incremental isometric contraction test, and inter-region differences were found
at 30% MVC.
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