Sex differences in active tibialis anterior stiffness evaluated using supersonic shear imaging

详细信息    查看全文

• 作者：Robin Souron^a ; Florian Bordat^a ; Adrien Farabet^a ; Alain Belli^a ; Lé ; onard Feasson^a ; ^c ; Antoine Nordez^b ; Thomas Lapole^a ; ^{thomas.lapole@univ-st-etienne.fr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：EMG ; Electromyographic ; EMGMAX ; Maximal electromyographic activity ; MVC ; Maximal voluntary contraction ; RMS ; Root mean square ; SIEMG ; Slope of the curve between TA shear modulus and EMG activity ; SITORQUE ; Slope of the curve between TA shear modulus and normalized torque ; SSI ; Supersonic shear wave imaging ; TA ; Tibialis anterior muscle
• 刊名：Journal of Biomechanics
• 出版年：2016
• 出版时间：3 October 2016
• 年：2016
• 卷：49
• 期：14
• 页码：3534-3537
• 全文大小：455 K

文摘

This study aimed to evaluate the sex difference in active muscle stiffness of the tibialis anterior muscle (TA) through shear modulus measurements performed using supersonic shear imaging (SSI) technique. Twenty-five women and twenty-one men participated in this study. Joint torque, electromyographic (EMG) activity and shear modulus were measured during two sets of submaximal dorsiflexions performed at 20, 30, 40, 50 and 60% of maximal voluntary contraction (MVC) in a random order. The first set was devoted to the EMG recordings and the second set was devoted to the elastographic measurements. For each set, subjects performed three 5-s trials at each level of submaximal voluntary contraction. Stiffness indexes were calculated as the slopes of the linear regressions established between shear modulus and joint torque (SI_TORQUE) or estimated TA EMG levels (SI_EMG). In the present study, no sex effect was reported for SI_TORQUE, SI_EMG (p=0.76 and p=0.86, respectively), and shear modulus measured at various contraction levels. The results highlight that men and women presented similar TA active stiffness indexes determined using SSI. Regardless of sex, this result suggests similar intrinsic stiffness for the contracting TA.