CorSense having trouble sending HRV signal

Try the suggestions below if your CorSense is:

• Having trouble detecting your pulse
• Sending unusually high or low HRV and HR signals
• Intermittently "dropping" HRV and HR during a reading

If you are experiencing these issues, CorSense is likely having difficulty finding your pulse. Unlike with chest straps, there is huge anatomical variation in fingers - with sizes, shapes, skin colors, and underlying circulation patterns. Please note that the CorSense should not be put onto the finger until you've started the reading and the app prompts you to put on the CorSense. 

CorSense hardware and algorithms try to address these millions of unique combinations. 

However, in some cases, the standard "Index finger" position may not work smoothly.

Please try the below for your reading:

1. Minimize movement of the hand and arm (find a comfy body position)
2. Rub your hands together vigorously (increasing circulation)
3. Insert a smaller finger than your index finger
4. Insert a smaller finger with your palm UP on your lap while seated
5. Try standing (still) with CorSense hanging (still) from your hand - which is by your side

A strong pulse and clean signal help CorSense more accurately detect and measure Heart Rate Variability (HRV). A weak signal results in CorSense taking longer to detect RR-intervals, or sometimes displaying very high or very low heartbeat numbers.

Here is more info on these additional body positions:

Wrist

A neutral wrist position (no bend in the wrist) promotes healthy and consistent blood flow to the hand and fingers. The wrist can face up or down, whichever is more comfortable

Fingers

1. We see often that the user inserts their finger too far into CorSense. Instead, place the fingertip on the smooth sensor window in the middle, which is slightly back from the small rubber ridge.
2. Try different fingers, and find the one that works best for you. It may surprise you which one it is!
3. Keep your finger relaxed, not pressing unnecessarily on the CorSense.
4. If still not working, try placing your finger and CorSense on your lap instead of a hard surface - which may cause small vibrations and signal noise.

Body Position

The most recommended body position is seated, hand resting still in your lap, palm facing up. Keep your body still when taking HRV measurements with the CorSense.

You may take your HRV reading seated, standing, supine (lying down), reclined, in a squat, or any number of positions. Remain still during the reading, but natural breathing movements are not a problem.

Examples to Try

1. Seated in a chair
   • Hand resting still in the lap
   • Palm facing up
   • Comfortable back position
2. Lying in bed (supine)
   • Hand resting gently on hip
   • Palm facing down
   • Arm still
3. Seated at a table
   • Sit back in your chair
   • Do not lean weight on the table
   • Arm resting gently on the table with neutral wrist position
   • Finger not pressing into a table at all
4. Free standing
   • Weight evenly distributed in feet
   • Arm relaxed by side, neutral wrist, and relaxed hand
   • CorSense hanging from the finger, not pressing against anything
5. Seated on bedside
   • Hand resting still in the lap
   • Palm facing up
   • Comfortable back position

Remember to have the CorSense connected, and have the reading screen open, before you insert your finger and start the reading.

Additional tips:

• If the finger is too dry, apply moisturizer prior to using the CorSense unit.

• If the shell is too tight when the user places the finger in, try loosening the shell by inserting the thumb sideways, gently.