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Juerg Feldmann

Fortiori Design LLC
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Posts: 1,530
 #1 
Here a nice article from 2013.
 "
Adv Exp Med Biol. 2013;789:185-91. doi: 10.1007/978-1-4614-7411-1_26.

The Use of Portable NIRS to Measure Muscle Oxygenation and Haemodynamics During a Repeated Sprint Running Test.

Source

Centre for Sports and Exercise Science, University of Essex, Colchester, UK, bjonesa@essex.ac.uk.

Abstract

Portable near-infrared spectroscopy (NIRS) devices were originally developed for use in exercise and sports science by Britton Chance in the 1990s (the RunMan and microRunman series). However, only recently with the development of more robust, and wireless systems, has the routine use in elite sport become possible. As with the medical use of NIRS, finding applications of the technology that are relevant to practitioners is the key issue. One option is to use NIRS to track exercise training-induced adaptations in muscle. Portable NIRS devices enable monitoring during the normal 'field' routine uses to assess fitness, such as repeat sprint shuttle tests. Knowledge about the acute physiological responses to these specific tests has practical applications within team sport training prescription, where development of both central and peripheral determinants of high-intensity intermittent exercise needs to be considered. The purpose of this study was to observe NIRS-detected parameters during a repeat sprint test. We used the PortaMon, a two wavelength spatially resolved NIR spectrometer manufactured by Artinis Inc., to assess NIR changes in the gastrocnemius muscle of both the left and right leg during high-intensity running. Six university standard rugby players were assessed (age 20 ± 1.5 years; height 183 ± 1.0 cm; weight 89.4 ± 5.8 kg; body fat 12.2 ± 3.0 %); the subjects completed nine repeated shuttle runs, which incorporated forward, backward and change of direction movements. Individual sprint time, total time to complete test, blood lactate response (BL), heart rate values (HR) and haemoglobin variables (ΔHHb, ΔtHb, ΔHbO2 and ΔTSI%) were measured. Total time to complete the test was 260 ± 20 s, final blood lactate was 14.3 ± 2.8 mM, and maximal HR 182 ± 5 bpm. NIRS variables displayed no differences between right and left legs. During the test, the group-averaged data showed a clear decrease in HbO2 (max. decrease 11.41 ± 4.95 μM), increase in HHb (max. increase 17.65 ± 4.48 μM) and drop in %TSI (max. drop - 24.44 ± 4.63 %). tHb was largely unchanged. However, large interindividual differences were seen for all the NIRS parameters. In conclusion, this observational study suggests that a portable NIRS device is both robust and sensitive enough to detect haemoglobin changes during a high-intensity repeated shuttle run test. It therefore has the possibility to be used to assess exercise training-induced adaptations following a specific training protocol. However, it is at present unclear, given the individual variability, whether NIRS can be used to assess individual performance. We recommend that future studies report individual as well as group data.


This is a nice article and they are absolutely right. With 6 tests they did they just started to  see, that it could work. It is interesting that it takes often 5 - 10 years till we see  studies coming out.
 In our cases we will come up with ideas and recommendations  once we have a few hundred test done, as six is in the best case scenario are  a nice case study with little information on trends and applications.
. The other part of why we will see soon much more ideas and can share more  applications is the fact , that coaches in the field now can afford to do this testing. Artinins Portamon is a dream come true  with a portable device and it is a super equipment. The main drawback to make it   baseline use is  unfortunately the price  and with a price tag of a top HR watch the new MOXY unit  will just do that, open the field for practical applications as well as allow  study groups to apply 4 units 2 arms 2 legs to see the interactions of  Oxygenation during complex sport ideas like cross country skiing rowing and so on.
 With the ability we have now that we can have all for MOXY's on one PC screen makes it that much more fun to see and to  understand better how  it works.   As mentioend in another thread we will do 170 test next week to see  what and where we will have many more questions.
 The  many readers on here now from all over the world  will be a big part on developping great new applications in the field and for workouts together with us .

Juerg Feldmann

Fortiori Design LLC
Registered:
Posts: 1,530
 #2 
Here another great study form the same group.
 
Adv Exp Med Biol. 2013;789:179-84. doi: 10.1007/978-1-4614-7411-1_25.

Using Portable NIRS to Compare Arm and Leg Muscle Oxygenation During Roller Skiing in Biathletes: A Case Study.

Source

Centre for Sports and Exercise Science, School of Biological Sciences, University of Essex, Colchester, UK, chesfo@essex.ac.uk.

Abstract

Portable near-infrared spectroscopy (NIRS) has been shown to be a useful and reliable tool for monitoring muscle oxygenation and blood volume changes during dynamic exercise in elite athletes. The wearable nature of such technology permits the measurement of specific muscles/muscle groups during realistic sport-specific exercise tasks in an outdoor environment. The aim of this case study was to observe the effect on arm and leg muscle oxygenation of roller skiing over a typical outdoor racing course. Such information is required by coaches in order to ascertain whether an athlete is using the correct technique at different stages of the course. Two wearable NIRS devices (PortaMon, Artinis Medical Systems) were used to compare muscle tissue oxygen saturation (TSI%) and total haemoglobin (tHb) changes in the quadriceps muscle group (vastus lateralis) and a muscle of the upper arm (triceps) during roller skiing. During the flat section, quadriceps ΔTSI remained steady in both subjects, whereas triceps ΔTSI showed a reduction (-10 %). During the steep uphill section of the course, arm and leg TSI decreased equally in one subject (ΔTSI = -10 %), whereas there was a difference between the two muscle groups in the other subject (ΔTSIquadriceps = -2 %; ΔTSItriceps = -7 %). A difference was also seen between subjects during the downhill section of the course. This study presents the first example of the use of portable NI RSS to assess oxygenation and blood volume changes in multiple muscle groups during roller skiing in a realistic, outdoor setting.

 Now can you immagine when they can actually have 4 units  to do this testing to see bilateral reactions as well and thisi for  about 30'000 $ dollar less and even own the units and  than even train in the field  and the athlete actually has his tHb and SmO2  information right on his  HR monitor.
 Dream? Now we do this daily in a small town far north in the bush. ( Smile ) Thanks to Fortiori's MOXY and previoeus thanks to Artinis Portamon. 2 incredible great NIRS equipment, who complement each other in bigger test centers  and  MOXY now allows us to use the information with anybody in the field for  individual training. Interval is now real physiological based on not  on the amount of fingers you may have on your hand. Here  a great overlap from a test we did by using both at the same time on vastus laterlis.  This is a  IPAHD . on the pic. The top is Portamon info, the middle is MOXY info  and the bottom is the overalp of both.

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