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Posts: 266
This term is typicall written as SmO2 

This is the abbreviation for Muscle Oxygen Saturation which is what the MOxy Muscle Oxygen Monitor measures.

The "S" is upper case.  The "m" is lower case.  The "O" is upper case.  The "2" is subscripted (if you can).

The S refers to in the % of hemoglobin that is saturated with oxygen.  The S already implies a percentage so the % sign is typically not used.

The m refers to muscle.  A lot of other letters are used in medical applications.  SaO2 refers to arterial saturation.  ScvO2 refers to centeral venous saturation, etc.

Of course, the O2  refers to oxygen.

The term StO2 is also frequently used for this type of measurement.  In this case, the t refers to Tissue.
Juerg Feldmann

Fortiori Design LLC
Posts: 1,530
Good  points by Roger, as many coaches and readers may not yet be familiar with NIRS and readings of reseaerch as well as printouts from all different types of equipment.
 In the practical world out there, where you and I move , we like to have a simple easy to use  read out and undestand the meaning of it. So basically like a HR number or a wattage value.
 Remember, that when using physiological information the absolute number  may be of less value , than the actual trend information . L lactate on the go  during a run and or bike ride iis one of the biomarker you  only can use trend information.

So  in case we may be able to engage many more people on this forum here some info.
We may read and talk about :
 O2Hb standing for oxygenated hemoglobin. In prints it is most often used with a red trace.
HHb standing for deoxygenated hemoglobin. In prints is most often blue as a trace.
tHb standing for total hemoglobin and  we use  yellow as the trace colour. tHb is in fact the sum of O2Hb + HHb
Hb diff standing for hemoglobin difference. Meaning the difference between O2Hb and HHb. it is used in graphs with the colour purple.  In simple terms if looking for Hb diff. If the trace Hb diff is dropping we know O2Hb is dropping and visa versa.
 Last but not least TSI % or SmO2 is the saturation of tissue as a % of O2Hb to total Hb
 The actual formula is See att
So here a simple printout where you have some of this colours
This is one assessment done in Switzerland the other in Canada and both where at the london olympics in the same cat.
 You can see a very very different TSI (SmO2 ) reaction  in the same test protocol. The left  graph show increases in TSI as tHb increases versus the right  athletes shows a drop at the same stage in the same protocol .
 The left athlete has a  vascularisation and a mitochondria density limitation , the right  athlet has a respiratory limitation.
 The  result of this conclusion was retrieved by looking at the same time in this assessment not just at NIRS info but we run  at the same time VO2 and repsirtaory equipment as well as noninvasive cardiac equipment including lactate trends.
 The weakest link ( Limter) will create the first homeostasis disruption and at the same time we can see, what system may try to compensate.
 Last picture our  physiology in a simple "picture"

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