https://www.bikeforums.net/ en Wed, 29 Apr 2026 02:22:55 GMT vBulletin 60 https://www.bikeforums.net/images/misc/rss.jpg https://www.bikeforums.net/ https://www.bikeforums.net/training-nutrition/1319693-calcium-ride-feel.html Tue, 31 Mar 2026 23:31:37 GMT 6 weeks ago, I had a total thyroidectomy (removal) and aside from now taking a common thyroid replacement hormone (levothyroxine), I think I discovered an issue with calcium and my cycling. It’s common for parathyroids (not to be confused with thyroid) to be affected for some period of time from... 6 weeks ago, I had a total thyroidectomy (removal) and aside from now taking a common thyroid replacement hormone (levothyroxine), I think I discovered an issue with calcium and my cycling.

It’s common for parathyroids (not to be confused with thyroid) to be affected for some period of time from weeks to forever when a thyroid is removed. Parathyroid glands affect calcium levels in the body.

I’ve had a few terrible rides. Where I felt like I bonked, but fueling was not an issue. I’ve recently made a point to take some calcium (Tums) several hours before a ride, as well as one immediately before a ride. And the rides felt much better.

Obviously a very small sample size and a lot of room for other variables and placebo effect. Though I have noted my average power to heart rate. For the bad feeling rides, I’ve had a much higher heart rate compared to the average power.

I also think vitamin D plays a role in calcium levels and may factor in as well.

But I’m wondering if anyone else has any experience with calcium levels and cycling performance. Especially gross feelings like good versus awful feeling rides. ]]> Mtracer https://www.bikeforums.net/training-nutrition/1319693-calcium-ride-feel.html