Inclusion Criteria:  Age≥18 years Body mass index < 30 kg/meter square Having no upper extremity injuries Willing and able to provide the written informed consent for the study  Exclusion Criteria:  Use of medication that will affect muscle tone History of lateral or medial epicondylitis, trauma (elbow, hand or wrist), cervical radiculopathy, peripheral neuropathy or nerve injury (axillary, median, ulnar, radial, musculocutaneous), systemical diseases, muscle disorders (e.g. genetic diseases, neuromuscular disorders)