| Outcome Measures: |
Primary: Total blood flow, Volume of blood per unit time, ml/min, Measured during 30 minutes of MRI. One measurement will be done on each study day, a total of 4 measurements for each participant, over the span of the study (approximately 1 year).|Regional renal perfusion, volume of blood per unit time per unit tissue mass, ml/min/g, Measured during 30 minutes of MRI. One measurement will be done on each study day, a total of 4 measurements for each participant, over the span of the study (approximately 1 year) | Secondary: Glomerular filtration rate, Volume per unit time, ml/min, Measured with Tec99-DTPA clearance. One measurement will be done on each study day, a total of 4 measurements for each participant, over the span of the study (approximately 1 year)|Sodium excretion in urine, Concentration, mmol/l, One measurement will be done on each intervention day, a total of 2 measurements for each participant, over the span of the study (approximately 1 year)|Activation of the renin angiotensin aldosterone system, Concentration, mmol/l, Blood samples will be taken 3 times on each intervention day, a total of 6 measurements for each participant, over the span of the study (approximately 1 year)|Blood pressure, mmhg, Measured continuously during a 60 minute period on each intervention day, a total of 2 measurements for each participant, over the span of the study (approximately 1 year)|Heart Rate, Beats pr. minute, Measured continuously during a 60 minute period on each intervention day, a total of 2 measurements for each participant, over the span of the study (approximately 1 year)
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