Effects of pelvic tilt angles and forced vital capacity in healthy individuals.

Only 18 healthy participants were tested, and they were 16 female and 2 male, so the results may not apply to men or to people with respiratory disease. The study did not meet the requirement that sitting height be identical when measuring pelvic tilt angles with the Palpation Meter. The number of male participants who could perform 10° anterior tilt was fewer than female participants, creating gender differences. The hypothesis was not fully supported for peak expiratory flow, because posterior tilt was not significantly different from neutral. The supplied text reports peak expiratory flow and FEV1, not forced vital capacity values, despite the title and discussion referring to forced vital capacity. The study did not include patients with respiratory disorders, who may have different thoracic flexibility and trunk muscle states.

Do not conclude that pelvic tilt on a stability ball improves breathing in patients. The study measured 18 healthy participants, and the peak flow difference between neutral and posterior tilt was not significant.