**Quick Fix:** To immediately restore a lost CGM signal during your exercise shift, dry any pooled sweat around the sensor and move your phone or receiver to an armband on the same side of your body as the device to clear the line of sight.
### Why Your CGM Loses Signal During Exercise Shifts
* **Bluetooth Signal Blocking (Body Shielding):** Bluetooth waves cannot easily travel through water, and because the human body is mostly water, bending, stretching, or shifting positions during a workout can block the signal between your sensor and receiver.
* *The Fix:* Keep your reading device within 20 feet and on the exact same side of your body as the CGM (e.g., if the sensor is on your left arm, wear your phone on a left-arm band).
* **Moisture and Sweat Interference:** Heavy perspiration during active shifts can seep under the transmitter, temporarily disrupting the electrical contacts between the sensor and the transmitter pod.
* *The Fix:* Apply a water-resistant medical overpatch (like Lexcam or ExpressionMed) before your workout to seal the perimeter and keep moisture out.
* **Muscle Compression (Pressure-Induced Drops):** Flexing muscles during lifts, lying on the sensor during floor exercises, or wearing tight athletic gear compresses the tissue around the cannula, temporarily stopping the flow of interstitial fluid and triggering a signal loss or false low.
* *The Fix:* Avoid placing the sensor over highly active muscle groups, wear loose-fitting workout clothing, and avoid exercises that put direct weight on the sensor site.
* **Micro-Displacements from High-Impact Movement:** Rapid shifts, jumping, or running can cause the skin to pull away from the sensor cannula, causing micro-tears in the adhesive and a temporary disconnect.
* *The Fix:* Use a liquid skin adhesive (like Skin Tac) during insertion to ensure the sensor remains fused to your skin during high-impact movement.
Recommended Fix
To immediately restore a lost CGM signal during your exercise shift, dry any pooled sweat around the sensor.Micro-tears in the adhesive also can cause temporary disconnect.Replacing a damaged sensor can sometimes fix the error
Skin Grip Adhesive Patches — [Long-Lasting, 100% Compatible with Dexcom G7 & Stelo Patch,Waterproof and Sweatproof, stays on through anything].
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