# Running with OmniLoop **URL:** \ **Category:** Type 1 & LADA\ **Tags:** dexcom, omnipod, closed-loop, loop\ **Created:** [May 21, 2019, 9:45pm UTC](https://forum.fudiabetes.org/t/running-with-omniloop/7533 "2019-05-21T21:45:40Z")\ **Posts on this page:** 1\ **Showing post:** 175
**Author:** ![Eric](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/eric/32/9209_2.png) [@Eric](https://forum.fudiabetes.org/u/Eric)\ **Post date:** [December 16, 2019, 7:27pm UTC](https://forum.fudiabetes.org/t/running-with-omniloop/7533/175 "2019-12-16T19:27:56Z")
> [@flyerfansince79](#): > > CGM This may be of interest to you. > [@Figure out your sweat loss for CGM](https://forum.fudiabetes.org/t/figure-out-your-sweat-loss-for-cgm/1345): > > I have noticed that Dexcom really bonks on me after about an 1 to 1 1/2 hours of running. This is because of the amount of sweat loss I have, which reduces the effectiveness of the interstitial fluid for measuring BG. I occasionally check my sweat rate to know how much I should be drinking to replace lost fluids. Here is how to do it: (this is a very close approximation, but for simplicity, it ignores the small difference between Avoirdupois weight in ounces and fluid ounces…): Do a bit of … * * * * * * * * * And some references on the effects of dehydration and CGM accuracy. I don’t rely on CGM during exercise. I sometimes bring it along for general illustration purposes, but I go with BG tests for my actual numbers now. > However, it might be that longer-duration exercise and the potential for dehydration could decrease the glucose supply within the interstitium, resulting in lower glucose levels compared to the capillary and venous systems. Furthermore, the lag time in interstitium could be influenced by the intensity of exercise and the amount of circulating insulin. Low insulin reductions combined with high exercise intensities could increase the lag time between the blood and the interstitium, resulting in severe impairments for continuous and flash glucose monitoring systems. > **[Interstitial Glucose and Physical Exercise in Type 1 Diabetes: Integrative...](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5793321/)** > > Continuous and flash glucose monitoring systems measure interstitial fluid glucose concentrations within a body compartment that is dramatically altered by posture and is responsive to the physiological and metabolic changes that enable exercise... --- _[View the full topic](https://forum.fudiabetes.org/t/running-with-omniloop/7533)._