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
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
’ 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 V’ O2 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.