Hand Position, CPR Quality and Rescuer Comfort

This randomized crossover simulation study will compare two hand positions used during chest compressions: interlocked fingers and non-interlocked hands placed one on top of the other. The study will evaluate whether the non-interlocked hand position is non-inferior to the interlocked-finger technique with regard to chest compression depth, and will compare the two techniques in terms of CPR quality, rescuer comfort, fatigue, pain or discomfort, and perceived hand-position stability.

Inclusion Criteria: * Adults aged 18 years or older * Healthcare professionals or laypersons * Physically able to perform chest compressions * Able and willing to provide written informed consent to participate in the study Exclusion Criteria: * Acute injury of the upper extremities * Chronic musculoskeletal disease or symptoms that may interfere with the ability to perform chest compressions with adequate quality * technical issue during data collection