The Wolff–Chaikoff effect ameliorates heat stress in rats

Table 1 Thyroid and total antioxidant activity responses to potassium iodide treatment in heat-stressed rats

Parameter	Treatment^c
	CN	KI	SE
Free thyroxine (ng/dL)	1.10^a	0.95^a	0.15
Free triiodothyronine (pg/mL)	1.91^a	1.66^a	0.08
Total antioxidant capacity (µM CRE)^b	198.80^a	238.30^a	9.10

^aRow means with different superscripts differ significantly (P < 0.05)
^bCopper reducing equivalent
^cTreatment groups received either 0 (control; CN) or 0.5% potassium iodide (KI) in drinking water; 3 h prior to the heat stress challenge (ambient temperature—T_a = 33.22 ± 0.25 °C; RH% = 31.62 ± 1.03%) from 09:00 to 13:00 h on Day 4. Climatic conditions during the 10-day experimental duration were set to 4 days at thermoneutrality (TN; T_a = 23.60 ± 0.05 °C; RH% = 44.70 ± 0.21%), then HS for 4 h, and finally back to TN until the end of trial

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