TG and sarcopenia: Other studies have discussed the association of thyroid hormone concentrations with sarcopenia in euthyroid elderly subjects (11–13), and a systematic review revealed that low levels within the normal range of free triiodothyronine (FT3), high levels within the normal range of free thyroxine (FT4), and lower thyroid hormone ratio (FT3/FT4) may contribute to a reduced muscle function, which seems more evident in older males (14).