A few days to go on our group in Boulder here what the "homework" is all about.
After some practical examples yesterday back to some ideas.
Ideas we offered for discussions many years back and now we see slowly support and confirmations on what we where looking in practical terms of Demspey's metaborelfex.
Here a very nice small study on respiration and NIRS and possible metaboreflex information. The second study is a study which is close to what I sent you with vastus medialis and lateralis as a practical example. Here it is nice to read.
So you will see, that we will have a great small group so we can really talk and discuss and not just listen and swallow. I am so looking forward sharing some good and some less optimal ideas with all of you .
My goal. how can we integrate MOXY in our daily activity schedule to improve individual physiological guided exercise pprograms.
Related trends in locomotor and respiratory muscle oxygenation during exercise.
Legrand R, Marles A, Prieur F, Lazzari S, Blondel N, Mucci P.
Laboratory of Human Movement Studies, Faculty of Sports Sciences and Physical Education, Lille University, Lille, France.
We investigated the potential effect of respiratory muscle work on leg muscle oxygenation without artificial intervention in non-endurance-trained young subjects and searched for the range of intensity when this effect could occur.
We simultaneously monitored accessory respiratory and leg muscle oxygenation patterns with near-infrared spectroscopy (NIRS) in 15 healthy young men performing maximal incremental exercise on a cycle ergometer. Pulmonary gas exchange was measured. The respiratory compensation point (RCP) was determined. Oxygenation (RMO2) and blood volume (RMBV) of the serratus anterior (accessory respiratory muscle) and of the vastus lateralis (LegO2 and LegBV) were monitored with NIRS. The breakdown point of accessory respiratory muscle oxygenation (BPRMO2) and the accelerated (BP1LegO2) and attenuated fall (BP2LegO2) in leg muscle oxygenation were detected.
BPRMO2 occurred at approximately 85% .VO2max and was related to RCP (r = 0.88, P < 0.001). BP2LegO2 appeared at approximately 83% .VO2max and was related to RCP (r = 0.57, P < 0.05) and with BPRMO2 (r = 0.64, P = 0.01). From BP2LegO2 to maximal exercise, LegBV was significantly reduced (P < 0.05).
In active subjects exercising at heavy exercise intensities, we observed that the appearance of the accelerated drop in accessory respiratory muscle oxygenation-associated with high ventilatory level-was related with the attenuated fall in leg muscle oxygenation detected with near-infrared spectroscopy. This suggests that the high oxygen requirement of respiratory muscle leads to limited oxygen use by locomotor muscles as demonstrated in endurance-trained subjects. The phenomenon observed was associated with reduced leg blood volume, supporting the occurrence of leg vasoconstriction. These events appeared not only at maximal exercise but onward above the respiratory compensation point.
[PubMed - indexed for MEDLINE]
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 ).
Author information ►Article notes ►Copyright and License information►
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), andvastus medialis (VM). Muscle deoxygenation was corrected for adipose tissue thickness and normalized to the amplitude of the HHb response, while EMGsignals 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 HHbresponse 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.
Keywords:incremental exercise, near-infrared spectroscopy, surface electromyography