There is evidence of the interdependence between the diaphragm and the C4 vertebral level with regard to nerve, fascial and muscular connections. The purpose of this study is to evaluate the influence of cervical bilateral manipulation (C3/C4) on the thoracoabdominal kinematics in healthy young adults.
Inclusion Criteria: * Volunteers between 18 and 40 years of age. Exclusion Criteria: * Attending a degree in Osteopathy or being a health professional in this area; * Apprehension to cervical manipulation; * Be pregnant; * Presenting cervical pain on the day of the study; * Does not comply with the Australian Vertebral Artery Protocol guidelines; * Having a clinical history of cervical and/or thoracoabdominal surgery; * Having a clinical history of cervical trauma during the prior 12 months; * Recurrent use of anti-coagulant and/or analgesic, muscle relaxant or anti-inflammatory therapeutics during the week before the study; * Have been submitted to any manual intervention at cervical region during the week before the study; * Having cardio-respiratory, neurological, rheumatic, oncologic and/or systemic diagnosed pathologies.