Hi everyone! I’ve been on this site for a few weeks now and have found it incredibly helpful—thank you all for your support! If it wasn't for this group, I wouldn't have been so proactive in getting the extra resources I needed!
Quick backstory: In 2018, I noticed a decline in my kidney function during my yearly bloodwork at age 41. I had been dealing with horrible back pain after running a marathon and was taking Advil regularly. Over the years, my creatinine levels have slowly crept up, though my GP didn’t seem too concerned, even though my numbers fluctuate each year. In November 2023, my eGFR was 66, and creatinine was 1.05. I had my first eGFR test at that point.
In February 2024, I started high-intensity workouts with F45 and really loved them. In May, my bloodwork showed an eGFR of 63 and creatinine of 1.09. My doctor dismissed it as "normal," but I became worried and decided to stop the F45 workouts. Then, on October 3rd, my eGFR dropped to 52 with creatinine rising to 1.29. October 23rd, my eGFR was 59 with creatinine 1.15.
I pushed my GP to order additional tests, including a urine test, ultrasound, and referral to a nephrologist.
I saw the nephrologist last Friday, who mentioned that my kidney function is fluctuating between stage 2 and stage 3a. He believes the damage may be due to medication use and dehydration. He said it's okay to resume high-intensity workouts but recommended I avoid lifting heavy weights that could potentially damage my muscles (which is a core part of F45 workouts). He also suggested following the DASH diet for hypertension or the Mediterranean diet, along with proper hydration, to help manage kidney function while being active.
So, I’m hoping to hear from others who have experience with weight training and kidney function. Have any of you had negative results from lifting or high-intensity workouts while managing kidney health? I’m also planning to run another marathon—most likely my last one—and am on the waitlist to run with the National Kidney Foundation. My nephrologist said we would monitor my kidney function closely and stop if needed, but I’d love advice or stories from others who’ve balanced exercise with kidney concerns.
Thanks so much in advance!