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Juerg Feldmann

Fortiori Design LLC
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Posts: 1,530
 #1 
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

b

 

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

 

c

 

 

 

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

 

d

 

 

 

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

 

Accepted 30 January 2003

 

Abstract

 

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.

 

r

 

 

 

2003 Elsevier Science Ltd. All rights reserved.

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