Sign up Latest Topics
 
 
 


Reply
  Author   Comment  
Juerg Feldmann

Fortiori Design LLC
Registered:
Posts: 1,530
 #1 
I like to put this   study up   out  if different reasons.
 1. Look at  2013   and the comment. Portamon as they used  was integrated many many years back just nobody was interested in.
 Now  the  reason of  not doing it as   it is too expensive is gone with MOXY we can have   one rugby player   and  on each leg a MOXY   and  do that on 7  at the same time so close to this study  and all in 30 min  for the same price and even can see live on the screen how they react all on the same screen.
 Fortiori  has   it going  and  many coaches now  can use this interesting tool.
 
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.


  What surpises  me is the change  or  not change in tHb  they  explain in their study. Imagine a  top athlete   sprinting  and stopping  and  accelerating again  and  there  suppose to be no change in  tHb  Blood volume   during this stop and start  due to compression and decompression?.
 As well a  very small drop in TSI %  for the intensity they  can do.
 . We did   the same testing   many years back with the same equipment  and had the same results . in fact TSI  in some cases actually  would go up instead of  down.!!!
 Reason you can see in  an explantion we gave  prior on the difference  betwen a  top world class  NIRS  for research  and in clinical settings , where the assumption has to be done, that tHb  is stable, versus a MOXY which  is build  for practical applications  and outdoor use.
  Have  fun to stay tuned, as we  have a great Rugby coach  now  working and challanging us  daily  with his top  canadian team  and  changeing  some ideas  combining with  his  great experience. Look at Rubgy  as the  new olympic sport   showing up in RIO  and look    where you may see players  now on a field  with a small device on their body.

Juerg Feldmann

Fortiori Design LLC
Registered:
Posts: 1,530
 #2 
Here another great article  I showed  once   form the same group.

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 NIRS to assess oxygenation and blood volume changes in multiple muscle groups during roller skiing in a realistic, outdoor setting.

What I like most is this part here :
  This study presents the first example of the use of portable NIRS to assess oxygenation and blood volume changes in multiple muscle groups during roller skiing in a realistic, outdoor setting.

 Watch this pics. Look at the  years, when it was done    !!!!!
   Thanks to  Duncan Clark  from Abu Dhabi . It is not   only  a NIRS  outdoor but as well non invasive   cardiac hemodynamic . with Physio Flow. and VO2  .  In simple terms, it is a  perfect  in the field  complet  IPAHD.  Now  Marcel  as a MOXY owner  can even look at   arm and legs   if we look at possible differences in upper and lower body.
  This is a  UK Biathlete  Marcel  Laponder  and here  is  his very great  blog  side
http://train-smarter.blogspot.ca/search?updated-max=2012-05-08T07:55:00%2B02:00&max-results=3

Attached Images
Click image for larger version - Name: Marcel_real.jpg, Views: 22, Size: 46.29 KB  Click image for larger version - Name: marcel_graphs.jpg, Views: 22, Size: 66.19 KB 

Juerg Feldmann

Fortiori Design LLC
Registered:
Posts: 1,530
 #3 
and here a last one for today

The use of near infrared spectroscopy in sports medicine.

Source

Department of Biomedical Sciences and Technologies, University of L'Aquila, L'Aquila, Italy. vale@univaq.it

Abstract

In the last 15 years the study of the human muscle energetics in sports medicine underwent a radical change thanks to the progressive introduction of non-invasive techniques, including near infrared (NIR) spectroscopy (NIRS). NIR light (700-1000 nm) penetrates skin, subcutaneous fat and underlying muscle, and is either absorbed (by oxy- and deoxy-haemoglobin) or scattered within the tissue. NIRS is a non-invasive and relatively low cost optical technique that is becoming a widely used instrument for measuring muscle O(2) saturation and changes in haemoglobin volume. Muscle O(2) saturation represents a dynamic balance between O(2) supply and O(2) consumption in the small vessels such as the capillary, arteriolar and venular bed. NIRS offers the advantage of being less restrictive than (31)P-magnetic resonance spectroscopy with regard to muscle performance and more comfortable and suitable for the monitoring, with high temporal resolution (up to 10 Hz), of multiple muscle groups. The aim of this review is to summarise the NIRS instrumentation and the measurable parameters, the role of NIRS in muscle exercise physiology, and the applications in sports medicine. The advantages and the problems of NIRS measurements, in resting and exercising skeletal muscles, are reported. The results of several studies suggest that NIRS is a powerful tool for being applied successfully in sports medicine. NIRS can objectively evaluate muscle oxidative metabolism in athletes and its modifications following potential therapeutic strategies and specific training programs.


What I like  here is :
   NIRS is a powerful tool for being applied successfully in sports medicine. NIRS can objectively evaluate muscle oxidative metabolism in athletes and its modifications following potential therapeutic strategies and specific training programs.

applied successfully in sports medicine
It is applied  successfully with  people on the street  , coaches  and  test centers. It is long  not anymore a tool  of  sport medicine  ,but a common used  equipment like a HR monitor  as well as  a power meter. SWINCO  (Swiss innovation  concept [wink] in partnership with  eukholdings@gmail.com
  started  in europe  a  center and are now in the process of   partnering with all the different countries in europe  exactly for the above purposes . Helping to create  individual  specific  training programs  in sport rehabilitations and fitness area.
 Personal trainer and coaches  can now  really look at their ideas and support the cleients by having a live feedback  from MOXY on the wrist or on their PC as a  live feedback.


Juerg Feldmann

Fortiori Design LLC
Registered:
Posts: 1,530
 #4 
Here a great feedback  from Matt.
 It shows  the  oxygenation trend of a RUGBY  referee  during  the first part of a game.
 When we  look at the real live  needs  in a game, whether it is a referee or a player we than can design  accordingly  an assessment protocol  as well as a training program.
 Here  the  info in pictures  what is going on in a Rugby referee during his  time on the field.
  Pic  1  SmO2  trends
Pic  2  SmO2  and tHb  and pic  tree  for easier understanding bias  HHb and O2Hb  and tHb.
.
 Interesting is again  and it  goes back to the 2 questions.
 If  we go  all out  how come, that in an " anaerobe" load  we see  the SmO2  dropping.
 Why  do we talk about  anaerobe  alacticid   on what is this based on ?  So the questions goes back  to the  demand of an activity . What is endurance  . And  depednng on the  answer  best  fit to the activity  the next question would be:
 What improves this specifc  demand.?

Attached Images
Click image for larger version - Name: schiri_smo2.jpg, Views: 17, Size: 173.69 KB  Click image for larger version - Name: schiri_thb_smo2.jpg, Views: 17, Size: 159.65 KB  Click image for larger version - Name: schiri_O2Hb_HHb_thb.jpg, Views: 20, Size: 183.63 KB 

Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

HTML hit counter - Quick-counter.net