Fig. 3From: Measurements of the trapezius and erector spinae muscles using virtual touch imaging quantification ultrasound-Elastography: a cross section studyPhysical activity. Difference in shear wave velocity of the erector spinae muscle, depending on the physical activity of the 18- to 30-year-old subjects, specified in hours per week (subdivided into ≤ 6 h per week (n = 131) and >6 h per week (n = 24); * = significant (Ulm University Hospital, 2013)Back to article page