Table 1.

The night and day baseline values and night–day differences of MAP (mmHg) and HR (bpm) of control F344 and BN rats in 2 different cage types (IVC and open top).

	IVC				Open top
	F344		BN		F344		BN
	MAP	HR	MAP	HR	MAP	HR	MAP	HR
Night	115.3	376.4	93.8	309.0	113.1	395.1	92.4	301.3
Day	108.9	320.9	92.0	277.6	105.2	327.1	91.1	282.8
Night – day	6.4	55.5	1.8	31.4	7.9	68.0	1.3	18.5