My physical 6 months ago showed an elevated BUN level (34, should be 20 or less) which is normally used to test kidney function. My doc explained that dehydration, high protein intake, and high intensity exercise can all contribute to an elevated BUN level. After 10 days of easy spins and reduced intensity in the gym my BUN dropped to 21.
Last week I had my BUN checked again and it was back up to 30. Of course I’ve been doing plenty of high intensity bike workouts as part of my polarized plan as well as a couple hard training days in the gym each week. Also eating a fairly high protein diet.
My question to all you other training masochists out there is have you experienced similar issues with your blood urea nitrogen levels?