Pulmonary function tests performed on fifteen healthy males revealed that when participants adopted a forward head posture (FHD), they had significantly lower forced vital capacity, expiratory and inspiratory reserve volumes, forced expiratory volume at one second, and peak flow rate. Doctors of chiropractic routinely check for FHD and recommend exercise and ergonomic modifications to address this faulty posture.

Journal of Physical Therapy Science, January 2019