Patient is age \< 18 years at time of consent

Patient is pregnant

Patient is moribund

Patient has an implanted pacemaker/defibrillator

Patient has a documented diagnosis of epilepsy

Patient has implanted femoral rods

Patient has leg or pelvic trauma that limits mobility

Patient has recent trauma resulting in GCS \< 5

Patient lacks ability to walk without assistance prior to acute ICU admission

Patient has neuromuscular disease or abnormalities

Patient is morbidly obese (BMI \> 40)

Patient has a cognitive impairment or inability to follow commands prior to acute ICU admission

Patient was transferred after \> 48 hours at another acute care institution

Enrollment in another investigational device or drug trial that could compromise the conduct or results of the study

Evidence of disease or condition that, in the opinion of the physician, may compromise the conduct of or results of the study

Safety and Performance of Muscle Activation for Critical Care Patients