Аннотация:Shear modulus in the biceps of volunteers was measured with standard ultrasound equipment, the at loads from 0 to 50 N. The measurements were carried out by shear wave elastography in the clinic according to the medical protocol. The volunteer held a sport weight of known mass to load the bicep. Shear wave was excited in the muscle at a given depth by an ultrasonic sensor. The shear wave velocity was recorded in the specific point, which was determined by the position of the sensor. The shear modulus of the muscle fibers measured by elastography increases from 10 to 60 kPa with the increase of the load and returns to 10 kPa 1 min after load is removed. The maps of the shear modulus distribution were measured in the areas around the points of the shear velocity measurements. Research was funded by the grant from the Russian Science Foundation (Project No. 19-72-00086).