Table 1.

Thyroid hormone concentrations and morphometric parameters in control and hyperthyroid rats.

	Control	Hyperthyroidism
T3 free, nmol/L	5.2 ± 0.1	9.3 ± 1.2 ***	78%↑
T4 free, nmol/L	19.2 ± 1.0	66.2 ± 4.4 ***	244%↑
Body weights, g	256 ± 3.3	236 ± 3.1 ***	8%↓
Body weight gain, g	36 ± 2.2	14 ± 2 ***	157%↓
Heart weights, g	0.9 ± 0.02	1.2 ± 0.03 ***	33%↑
Heart/body weight (×103)	3.4 ± 0.06	4.8 ± 0.13 ***	41%↑

*** p ˂ 0.001 compared with the control data (n = 10 in each group). Changes induced by thyroxine: ↑—increase, ↓—decrease.