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Wednesday, July 10 • 12:50 - 13:10

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Since human muscles, particularly biceps, have an anisotropic structure associated with fibrous structure, it is important to study the muscle taking into account its anisotropy. We constructed a simple ultrasonic shaker to control the activity of the biceps. The device performs non-invasive control of the biceps state from the surface. A certain frequency of the tissue displacement caused by the vibrating indenter is chosen to excite shear waves inside the biceps. The displacement of the tissue then can be registered by means of the ultrasonic signal emitted from the transducer that is firmly connected to the indenting surface. Both speed and frequency of the shear waves are smaller than the same properties of the ultrasound. The device is a rectangular ultrasonic transducer attached to the front part of the movable vibrator plate. The vibrator with the help of the movable plate, leaning the front part of the bicep, excites shear waves in it. An ultrasound transducer monitors the propagation of shear waves in the muscle in real time. Two-channel signal generator connected to the operating computer powers both the vibrator and the ultrasonic transducer. Registration of ultrasound pulses received by the piezoelectric element is performed using an oscilloscope also connected to a computer. Thus, power signals are formed and evaluation is implemented in specially developed software. The transducer has a form of an elongated rectangle which makes it possible to register the shear waves excited in two polarizations: along and perpendicular to the muscle fibers and measure the shear elasticity of the muscle taking into account its anisotropy. Measurements of biceps shear elasticity are carried out at various loads: static and variable. The processes of biceps relaxation are investigated. This will help to develop a method that will determine the effect of muscle load on its growth and damage.

avatar for Daniel Pereira

Daniel Pereira

Postdoc, École de technologie supérieure (ÉTS)


Wednesday July 10, 2019 12:50 - 13:10 EDT
Westmount 1

Attendees (3)