Here some suggestions and some additional info .
First. Fro cycling and running the vastus lateralis seems to give nice information's.
We use the connecting line between SIAS to the lateral fibula head and than go into the middle so we have a great way to get the same place.
I tried glut max as well as hamstrings but the most or biggest amplitude seems from the vastus lateralis.
I tried as well calf muscles but in running if you have a heel stricker not optimal info and as the speed changes many change the style form heel to at least mid foot but on a treadmill often to fore foot. So as well not bad info for vastus lateralis for walking and running . I can show later some tests we did to try this out.
I always take a see though plastic rap and a 2 m cover stretch roll piece. It takes 15 seconds to mount and never had a problem.
The relationship between muscle deoxygenation and activation in different muscles of the quadriceps during cycle ramp exercise
Lisa M. K. Chin,1,2 John M. Kowalchuk,3 Thomas J. Barstow,4 Narihiko Kondo,5 Tatsuro Amano,5 Tomoyuki Shiojiri,6 and Shunsaku Koga1
1Applied Physiology Laboratory, Kobe Design University, Kobe, Japan;
2Rehabilitation Medicine Department, Clinical Center, National Institutes of Health, Bethesda, Maryland;
3School of Kinesiology and Department of Physiology and Pharmacology, The University of Western Ontario, London, Ontario, Canada;
4Department of Kinesiology, Kansas State University, Manhattan, Kansas;
5Faculty of Human Development, University of Kobe, Kobe, Japan; and
6Laboratory of Exercise and Sports Science, Yokohama City University, Yokohama, Japan
Address for reprint requests and other correspondence: S. Koga, Applied Physiology Laboratory, Kobe Design Univ., 8-1-1 Gakuennishi-machi, Nishi-ku, Kobe 651-2196, Japan (e-mail: email@example.com ).
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Received October 15, 2010; Accepted July 25, 2011.
This article has been cited by other articles in PMC.
The relationship between muscle deoxygenation and activation was examined in three different muscles of the quadriceps during cycling ramp exercise. Seven young male adults (24 ± 3 yr; mean ± SD) pedaled at 60 rpm to exhaustion, with a work rate (WR) increase of 20 W/min. Pulmonary oxygen uptake was measured breath-by-breath, while muscle deoxygenation (HHb) and activity were measured by time-resolved near-infrared spectroscopy (NIRS) and surface electromyography (EMG), respectively, at the vastus lateralis (VL), rectus femoris (RF), and vastus medialis (VM). Muscle deoxygenation was corrected for adipose tissue thickness and normalized to the amplitude of the HHb response, while EMG signals were integrated (iEMG) and normalized to the maximum iEMG determined from maximal voluntary contractions. Muscle deoxygenation and activation were then plotted as a percentage of maximal work rate (%WRmax). The HHb response for all three muscle groups was fitted by a sigmoid function, which was determined as the best fitting model. The c/d parameter for the sigmoid fit (representing the %WRmax at 50% of the total amplitude of the HHb response) was similar between VL (47 ± 12% WRmax) and VM (43 ± 11% WRmax), yet greater (P < 0.05) for RF (65 ± 13% WRmax), demonstrating a “right shift” of the HHb response compared with VL and VM. The iEMG also showed that muscle activation of the RF muscle was lower (P < 0.05) compared with VL and VM throughout the majority of the ramp exercise, which may explain the different HHb response in RF. Therefore, these data suggest that the sigmoid function can be used to model the HHb response in different muscles of the quadriceps; however, simultaneous measures of muscle activation are also needed for the HHb response to be properly interpreted during cycle ramp exercise.