Head/Neck position on spine movement.

Studies carried out by an international group have established that there is a significant influence of head/neck position on spine movement. Positions with an elevated neck tend to induce extension (hollowing) in the thoracic region and flexion (rounding) in the lumbar region. Lower neck positions produce the opposite. High neck positions generally lead to reduced movement of vertebrae, especially in the lumbar area, but low-neck positions increase motion. A very high neck position seems to greatly disturb normal motion, much more than a strongly flexed position (Gómez Álvarez et al., 2006; Weishaupt, 2010, Rhodin et al. 2005).