2.5. BIA Measurements
fat-free mass
We performed the measurement of body composition using the InBody S10 (Biospace Co, Ltd., Cheonan, Republic of Korea) according to the manufacturer’s protocol. This machine is a body composition analyzer based on the direct segmental multi-frequency bioelectrical impedance method. In brief, the examinee assumed a supine posture for approximately 10–15 min before the test, ensuring no contact between the examinee’s body and conductors during testing. We used touch-type electrodes, attaching them to the examinee’s hands and feet. Patients’ latest weight and height were entered as essential information for body composition analysis. The InBody S10 then analyzed the measurement results based on the input data of the patient. The outputs included intracellular water, extracellular water, total body water (TBW), protein mineral, body fat, soft lean mass, fat-free mass (FFM), weight, skeletal muscle mass, body fat mass, percentage of body fat, body mass index (BMI), segmental lean analysis, segmental water analysis, total and segmental water ratio (ECW/TBW), body cell mass (BCM), bone mineral content (BMC), arm circumference (AC), arm muscle circumference (AMC), waist circumference, visceral fat area, basal metabolic rate (BMR), TBW/FFM, body water history (12 times accumulated results), and impedance of each segment and frequencies (impedance, reactance, phase angle).