* diagnosis of another disease, which causes a permanent increase in carbon dioxide level in the blood (chronic hypercapnia) or a permanent combined lung weakness (particularly a neuromuscular disease) * body-mass-index (bmi) \>40 * expected absence of active participation of the patient in study-related measurements * alcohol or drug abuse * metal implant in the body that is not mri compatible (non mri compatible pacemaker, implantable defibrillator, cervical implants, e.g. brain pacemakers etc.) * slipped disc * epilepsy

* diagnosis of another disease, which causes a permanent increase in carbon dioxide level in the blood (chronic hypercapnia) or a permanent combined lung weakness (particularly a neuromuscular disease) * body-mass-index (bmi) \>40 * expected absence of active participation of the patient in study-related measurements * alcohol or drug abuse * metal implant in the body that is not mri compatible (non mri compatible pacemaker, implantable defibrillator, cervical implants, e.g. brain pacemakers etc.) * slipped disc * epilepsy

diagnosis of another disease, which causes a permanent increase in carbon dioxide level in the blood (chronic hypercapnia) or a permanent combined lung weakness (particularly a neuromuscular disease) body-mass-index (bmi) >40 expected absence of active participation of the patient in study-related measurements alcohol or drug abuse metal implant in the body that is not mri compatible (non mri compatible pacemaker, implantable defibrillator, cervical implants, e.g. brain pacemakers etc.) slipped disc epilepsy

diagnosis of another disease, which causes a permanent increase in carbon dioxide level in the blood (chronic hypercapnia) or a permanent combined lung weakness (particularly a neuromuscular disease) body-mass-index (bmi) >40 expected absence of active participation of the patient in study-related measurements alcohol or drug abuse metal implant in the body that is not mri compatible (non mri compatible pacemaker, implantable defibrillator, cervical implants, e.g. brain pacemakers etc.) slipped disc epilepsy