Inclusion Criteria:  Adult age ≥40 years old Generally healthy. No history of diagnosed vascular disease including: DVT, PE, VTE, peripheral vascular disease, post-phlebitic syndrome, or chronic venous insufficiency. Mentally alert and understand English proficiently. Able to give informed consent.  Exclusion Criteria:  Skin breaks, abrasion, or irritation in the area of the limb in contact with the OsciPulse device or reference therapies. Severe peripheral artery or venous disease.