Correlations between neck angles measures and muscular activity (sEMG, µV) along the spine for the entire population.

α represents the neck’s elevation, β the neck’s curve and γ the M3–M5 angle. Only significant results of Spearman correlation tests are presented here. Note that the most “representative” angle is β, which is neck’s curve. The correlation reveals the the highest the angle (concave neck), the highest the muscular activity on many different tested sites.