Table 1.

Effect of waterload on intra-renal oxygenation levels

Subject	Cortex		Medulla
	Pre- waterload R2* (1/s)	Post- waterload R2* (1/s)	Pre- waterload R2* (1/s)	Post- waterload R2* (1/s)
1	14.1	13.6	29.0	21.8
2	14.8	12.6	31.1	19.4
3	14.7	13.4	29.3	22.3
4	13.7	14.2	31.0	25.8
5	15.3	13.9	31.3	24.7
Mean	14.5	13.5	30.3	22.8†
s.d.	0.6	0.6	1.1	2.5

Post-waterload values in the medulla were calculated as the average of the time points when the temporal response reached an equilibrium value.

^†P<0.05 using a paired two-tailed Student’s t-test when compared to pre-waterload value.