Acoustic Myography in Assessment of Isokinetic and Isometric Muscle Strength in a Healthy Danish Population
Acoustic Myography in Assessment of Isokinetic and Isometric Muscle Strength in a Healthy Danish Population作者机构：The Parker Institute Copenhagen University Hospital Bispebjerg and Frederiksberg Denmark Department of Neurology Copenhagen University Hospital Bispebjerg and Frederiksberg Denmark Department of Veterinary and Animal Sciences Faculty of Health Science University of Copenhagen Copenhagen Denmark
出 版 物：《Journal of Biomedical Science and Engineering》 (生物医学工程（英文）)
年 卷 期：2020年第13卷第12期
页 面：235-253页
学科分类：082304[工学-载运工具运用工程] 08[工学] 080204[工学-车辆工程] 0802[工学-机械工程] 0823[工学-交通运输工程]
主 题：Muscle Strength Acoustic Myography Range of Motion Muscle Fibre Use
摘 要：Isokinetic and isometric force measurements involving a dynamometer setup are widely used in training and in muscle assessment. For further understanding of the method, we investigated the activation of key functional muscles during isokinetic and isometric movements. During force measurements in an isokinetic Biodex System 3 ProTM, acoustic myography (AMG) was applied. Ten healthy subjects (5 men/5 women) in each decade from 20 to 69 years of age participated in the study. Measurements were carried out during extension and flexion of the ankle, knee and elbow joints. Muscle fibre use was measured by efficiency (E-score) and fibre recruitment (temporal (T-score) and spatial (S-score) summation). AMG measurements showed good reproducibility, and the recruitment pattern of muscle fibres did not change with gender or age. Overall, a significantly higher E-score (P 0.05) was found at the lower angular velocities than at the higher ones, indicating a lower level of muscle efficiency at higher velocities. Muscles used for knee movement exhibited higher scores than muscles associated with the ankle and elbow joints, most likely related to the greater degree of force production at this joint compared to the ankle and elbow. The ability to activate and inactivate muscle fibres during periods of isokinetic activity becomes increasingly more difficult as the velocity increases. When assessing training effects in sports or rehabilitation, AMG in parallel with isokinetic measurements adds important additional information by giving a measure of possible improvements in efficiency and fibre use.
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