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Juerg Feldmann

Fortiori Design LLC
Posts: 1,530
A common question I am getting from different physiotherapist is the relations hip between NIRS and SEMG.
 Some may remember the UBC student we had here and he  showed a set of NIRS and SEMG  basic studies we did.. Here an independent study on this subject.
 For practical applications. I have used and still use SEMG  for objective information's for court cases and for reports for insurance companies . For direct information during a workout I used SEMG but one of the problems is the cable. Yes there are incredible great new SEMG wireless options out there but you look at 10'000 $ and more. So for me the MOXY replace the SEMG for live feedback during a workout. Why.
 With the SEMG I could make an audio signal  as a feedback or a  gr pah or number but it is much easier to have a life trace    together with a number and than a  task to either just go to deoxygenation lowest level  or to  try to create a a lowest level SmO2 plateau    as load intensity and as rest intensity we can give the three resp 4 options.  Incomplete reoxygenation, complete  reoxygenation, PLOI ( post load oxygenation intensity and  post PLOI. The initial assessment you have In other post will give you exact load and  deload time information  or much better  the patient has a moxy on his body and has the  information  on how to work out. Super great motivation and very  individual  but objective  load and deload  workouts accordingly to the clients ability .

Muscle oxygen consumption,determined by NIRS,in relation to

external force and EMG

M. Praagman


a,*,H.E.J. Veegera,b,E.K.J. Chadwickb,W.N.J.M. Colierc,d,

F.C.T. van der Helm


Faculty of Human Movement Sciences, Institute for Fundamental and Clinical Human Movement Sciences, Vrije Universiteit Amsterdam,

Van der Boechorststraat 9, 1081 BT Amsterdam, The Netherlands



partment of Mechanical Engineering, Man-machine Systems Group, Delft University of Technology, Delft, The Netherlands






Department of Physiology, University Medical Centre, Nijmegen, The Netherlands






Department of Geriatric Medicine, University Medical Centre, Nijmegen, The Netherlands


Accepted 30 January 2003




Local oxygen consumption in a muscle (V




O2) can be determined by near infrared spectroscopy (NIRS). In principle it should be


possible to use this measure to validate musculoskeletal models. However,the relationship between V




O2 and external force,or


between V




O2 and surface EMG,as a measure for muscle activity,is hardly known. The aim of this study was: (1) to evaluate the


characteristics of the relationship between V




O2 and external moments and (2) to determine whether differences exist between the


EMG-moment relationship and the V




O2-moment relationship. Subjects (n ¼ 5) were asked to perform isometric contractions


exerting combinations of elbow flexion and pro/supination moments at force levels up to 70% of their maximum. Simultaneous


surface-EMG and NIRS measurements were performed on the m. biceps breve (BB) and the m. brachioradialis (BR). A linear


relationship was found between EMG and V




O2: For the BB VO2 and EMG were linearly related to both the flexion moment and the


pro/supination moment. However,for the BR only a linear relationship with flexion moment was found. As expected,based on the


findings above,the relationship between V




O2 and elbow flexion moment can be described by a linear equation,under the conditions


of this study (isometric,and force levels up to 70%). These findings suggest that load sharing is independent of force level and that


next to EMG, V




O2 can be used for the validation of musculoskeletal models.






2003 Elsevier Science Ltd. All rights reserved.

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