"Physiological Responses to Manual Pressure in Healthy Adults"

Inclusion Criteria: * Age 18-65 years. * Healthy volunteers without diagnosed cardiovascular, neurological or severe musculoskeletal disorders. * No significant pain or pathology in the cervical, shoulder or upper back region that would interfere with pressure application. * Ability to understand the study procedures and to provide written informed consent. * Availability to attend the experimental session and the DEXA visit. Exclusion Criteria: * History of major cardiovascular disease (e.g., ischemic heart disease, heart failure, clinically significant arrhythmias, uncontrolled hypertension, stroke or transient ischemic attack). * Neurological disorders affecting pain perception or autonomic function. * Acute or chronic musculoskeletal conditions in the cervical or shoulder region that contraindicate manual pressure on the upper trapezius. * Coagulation disorders or high-dose anticoagulant/antiplatelet therapy that increases bleeding risk. * Dermatologic conditions or skin lesions at sensor placement or pressure application sites. * Pregnancy or suspected pregnancy (due to DEXA scan). * Regular use of medications with a major impact on autonomic or cardiovascular responses (e.g., beta-blockers, antiarrhythmics) that cannot be paused according to medical judgement. * Substance abuse or acute alcohol/drug intake in the 24 hours prior to the experimental session. * Any other condition that, in the opinion of the investigators, may compromise safety or compliance.