Registered: 1340810797 Posts: 263
This term is typicall written as SmO 2 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 saturation....as 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. SaO refers to arterial saturation. ScvO 2 refers to centeral venous saturation, etc. 2 Of course, the O refers to oxygen. 2 The term StO is also frequently used for this type of measurement. In this case, the t refers to Tissue. 2
Fortiori Design LLC
Registered: 1355349061 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" Attached Images
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