Inclusion criteria for patients group: Patients who are;  Individuals diagnosed with hyperthyroidism by a physician Individuals between the ages of 18-70  Exclusion criteria for patients group: Patients who are;  Use of drugs that affect the heart rate (except for short-term beta blockers given to relieve thyrotoxicosis symptoms) having problems that limit physical activity (orthopedic, neurological, psychological) having comorbidities such as uncontrolled hypertension, diabetes mellitus, heart failure or atrial fibrillation use of any medication that may affect thyroid function patients with acute infection during evaluation patients with uncontrolled hypertension, diabetes mellitus  Inclusion criteria for healthy group: Participants who are;  being between ages of 18 and 70 willing to participate to the study  Exclusion criteria for healthy group: Participants who are;  having any diagnosis of chronic diseases having health problems such as cooperation having acute infection during evaluation being current smokers being ex-smokers (≥10 pack*years)