[Postradiation changes in the thyroid gland and skeletal muscle after exposure to iodine-131]

The functional status of rat skeletal muscles was studied at dormancy and during the intensive muscular work under conditions of repeated administration of iodine 131 in doses causing reversible and irreversible damages to thyroid gland (the absorbed doses were from 0.27 to 266 Gy). The biochemical changes in muscles were transient; they correlated with the thyroid gland status and lifetime of animals and were displayed during the first 15 days and 2-12 months after the start of the isotope injection.