Vibroacoustic processes and structural variations in muscular tissue

Displacement Spectra Under Isometric Muscle Contraction

“…The difference in these values may be explained by accounting for the nature of isotonic and isometric muscle contractions. Isotonic contraction is associated mainly with synchronous excitation and correlated movements, which are, generally speaking, slower 9 compared to isometric contraction caused solely by uncorrelated movements at the subcellular level.…”

“…This consequence of explains, in particular, the similarity of the normalized spectra (Figures 4, right panels). Spectral analysis was also used earlier 9 for investigation of the acoustic activity of contracting muscles. Two types of such processes were examined, one of which was treated as vibrations due to macromolecular recombinations of muscle proteins at the subcellular level.…”

“…7,8 In this case, the so-called passive acoustic myography is used when muscle oscillations in the acoustic range are measured. 5,6,9 Ultrasound methods based on the analysis of Doppler signals from the myocardium and vessel walls have been used for a long time in clinical practice to determine the state of the cardiovascular system. 10 A physical model of ultrasonic scattering from myocardial tissue was proposed, and the angle and frequency dependencies of the acoustic backscatter coefficient and integrated backscatter were established.…”

“…It was shown that it is possible to control muscles at a neuromuscular transfer level, especially during the process of postoperative remission of muscle function and removal of a neuromuscular blockade 7 , 8 . In this case, the so‐called passive acoustic myography is used when muscle oscillations in the acoustic range are measured 5 , 6 , 9 …”