2.4. Body composition

Body composition was measured fasted in the morning based on air displacement plethysmography using a Bod Pod (Cosmed, Italy). Once the body density had been determined, the fat mass (FM) and fat-free mass (FFM) were calculated using the Siri equation. Thoracic lung volume was estimated using the Bod Pod software. During measurement, participants wore only a swimsuit and an acrylic swim cap. Repeatability of the BodPod measurements was previously determined as high [12]. Total body water (TBW) was assessed by bioelectric impedance with BodyStat 1500MDD (UK). The recommended measurement conditions were strictly followed during the bioimpedance analysis [13]. Repeatability of the BodyStat 1500MDD measurements was previously determined as good (ICC = 0.96, SEM = 4.5%) [12].