Table 1.

Chronic unpredictable stress paradigm.

Overcrowding	A total of 8 animals were placed in STD6 cages (610 × 435 × 215 mm) for 1 h
Restricted space	Four animals were confined in per STD2 cages (425 × 266 × 185 mm) for 1 h
Exposure to the hot air stream	Animals were exposed to a hot air stream ranging from 45 to 50 °C for 45 min. They were placed in STD cages (610 × 435 × 215 mm) in groups of four.
Cold water	Replacement of bedding material with cold water, 400 ml (18 C) for 1 h. They were placed in STD cages (610 × 435 × 215 mm) in groups of four.
Vibration	Placement on a vibrating/rocking platform for 15 min.