The answer is that the urine concentration increased (became less dilute). This because of the increased electrolyte concentration in the blood. It causes the hypothalamus-pituitary gland to relead anti-diuretic hormone (ADH). This hormone increases the aquaporin 2 pore in the distal tubules and collecting tubules of the nephrons in the kidneys. Water is reabsorbed from urine hence making it more concentrated.