Action of progesterone on contractile activity of isolated gastric strips in rats

Table 3 Effect of progesterone on the mean contractile amplitude of body after indomethacin or phentolamine pretreatment in rats

Gastric body muscle	Contractile amplitude/mm
	Pr		I + Pr				Ph + Pr
	B	C	B	C	B	C	B	C	B	C
LM	12.0 ± 16.9	-7.5 ± 5.5b	12.9 ± 17.1	-0.1 ± 6.0	12.5 ± 18.4	-8.2 ± 6.9b	12.1 ± 19.2	1.4 ± 3.8	15.4 ± 16.5	-5.2 ± 4.5d
CM	11.8 ± 12.9	-5.6 ± 3.0b	12.2 ± 14.0	1.2 ± 5.2	12.6 ± 13.2	-3.5 ± 2.5d	11.7 ± 12.6	0.2 ± 0.5	11.4 ± 13.0	-3.6 ± 2.7d

Phentolamine (1 µmol·L^-1) or indomethacin (10 µmol·L^-1) was added 3 min before the addition of progesterone (50 µmol·L^-1). x^-± s, n = 12. Pr: Progesterone, I: Indomethacin, Ph: Phentolamine.

^bP < 0.001 vs corresponding B by paired t test;

^dP < 0.01 vs Pr alone by two samples mean t test.