Development Team Member
Registered: 1482688495 Posts: 46
What is the difference between ThB and Tissue Hemoglobin Index (THI)?
If there's a difference what can THI show that ThB can't?
Registered: 1340810797 Posts: 266
THb and THI are generally just a different term for the same thing. They both measure the total amount of hemoglobin and myoglobin that the sensor has interacted with on an arbitrary unit scale.
The arbitrary scale means that you can't compare values from different NIRS device manufacturers or even from different locations on the same person. Lots of factors like fat layer thickness, blood hemoglobin concentration and myoglobin concentration can affect THb or THI but during the duration of a workout, the primary factor that contributes to changes in THb or THI is changes in blood volume. So it indicates if blood volume is going up, down , or staying the same.
Development Team Member
Registered: 1380484167 Posts: 1,501
If you go through more research you as well will find some questions. Difference between TSI % and SmO% we us with MOXY. Roger can give you more feedback on SmO2 as in simple terms the model they use for MOXY tries to give us feedback on where we like to have the feedback . From the muscle tissue.
TSI % is the tissue saturation index and they use a different idea. In simple terms it gives information on the O2 situation in the tissue so skin included. That's where people will see some fun difference between using a Portamon and a MOXY. We did many many tests using both to see who they related from our point of view. Here two main examples of setting we did and others did.( Clint Friesen in Florida ) 1. Compression clothing. When we looked TSI % with and without compression socks we had with compression socks a drop in TSI %., which initially created a wrong conclusion as it looked as if O2 situation got worse. BUT when we added a MOXY than we had the opposite the TSI % would still drop and MOXY SmO 2 would go up. .So we did the same with temperature games. When we cooled the skin TSI % would drop and MOX SmO2 would go up. So it seems that when we created a less optimal situation in the surface for blood flow the blood would move into deeper layers and therefor we would see an increase in SmO2 . So we used three different penetration depth with Portamon and there we cloud see the change as well but not in TSI % as TSI % seems to be the result of the overall layers. When we used heat SmO2 in MOXY would drop but TSI % in portamon would go up. Same situation. So with tHb and tissue Hb index we may have the similar difference. Now when we use Hb difference in portamon and SmO2 in MOXY and we crate a stable blood flow than this 2 information overlap absolutely equal . Will dig out some basic cases we did and show one or the other on here.