METRNL and hydrops fetalis: The plasma Metrnl protein levels in the HFT (25.02 ± 0.27 ng/mL) and HFNDT (24.52 ± 0.80 ng/mL) groups were significantly higher than those in the HF (22.27 ± 0.42 ng/mL) and HFND groups (23.02 ± 0.17 ng/mL) (p < 0.05) after 8 weeks of training (Fig. 2c).