UNIVERSITY OF KOBLENZ
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To that end, the Craniovertebral Angle (CVA), the Head-Tilt Angle (HTA), the Forward-Shoulder Angle (FSA), and the Adjusted Head-Position Angle (AHPA) were markerless determined in 78 subjects. The volunteers were asked to perform four different body postures with the following conditions: an upright sitting position, with maximum head protraction, looking at a smartphone, and with maximum flexion of the head.
Follow this link to get the full paper: https://juniperpublishers.com/jhnss/pdf/JHNSS.MS.ID.555646.pdf