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Juerg Feldmann

Fortiori Design LLC
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Posts: 1,530
 #1 
I got  2 questions from this great sports.
 Would a second MOXY makes sense so we test upper and lower body.
 Well I am biased  as we sell MOXY and I  have fun working with more than one.
 My main reason is, that I look  , whether a sift in tHb   at a certain moment during an IPAHD  goes to together with a relative stable CO ( cardiac output ) tested with the great Physio Flow.
 This way I  believe we can demonstrate  to an athlete, whether he has a  cardiac limiter or a muscular limiter.
 Dream or reality    with this simple method.
 Here  a more objective take on that  and why  2 MOXY's in many sports are the way to go  now.
 

Are the arms and legs in competition for cardiac output?

Source

The Copenhagen Muscle Research Center, Department of Anesthesia, Rigshospitalet, University of Copenhagen, Denmark.

Abstract

Oxygen transport to working skeletal muscles is challenged during whole-body exercise. In general, arm-cranking exercise elicits a maximal oxygen uptake (VO2max) corresponding to approximately 70% of the value reached during leg exercise. However, in arm-trained subjects such as rowers, cross-country skiers, and swimmers, the arm VO2max approaches or surpasses the leg value. Despite this similarity between arm and leg VO2max, when arm exercise is added to leg exercise, VO2max is not markedly elevated, which suggests a central or cardiac limitation. In fact, when intense arm exercise is added to leg exercise, leg blood flow at a given work rate is approximately 10% less than during leg exercise alone. Similarly, when intense leg exercise is added to arm exercise, arm blood flow and muscle oxygenation are reduced by approximately 10%. Such reductions in regional blood flow are mainly attributed to peripheral vasoconstriction induced by the arterial baroreflex to support the prevailing blood pressure. This putative mechanism is also demonstrated when the ability to increase cardiac output is compromised; during exercise, the prevailing blood pressure is established primarily by an increase in cardiac output, but if the contribution of the cardiac output is not sufficient to maintain the preset blood pressure, the arterial baroreflex increases peripheral resistance by augmenting sympathetic activity and restricting blood flow to working skeletal muscles.

Juerg Feldmann

Fortiori Design LLC
Registered:
Posts: 1,530
 #2 
Sorry here the add on  , why we use Physio flow  MOXY and VO2  all at the same time.
 Information on LIMITER (  respiration - metaboreflex  Dempsey )    cardiac  information and feedback  muscle metaboreflex O  and  local  limitation NIRS
 

Muscle metaboreflex control of the circulation during exercise.

Source

Centre for Healthy Aging and The Copenhagen Muscle Research Centre, Department of Biomedical Sciences, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark. boushel@sund.ku.dk

Abstract

This review covers the control of blood pressure, cardiac output and muscle blood flow by the muscle metaboreflex which involves chemically sensitive nerves located in muscle parenchyma activated by metabolites accumulating in the muscle during contraction. The efferent response to metaboreflex activation is an increase in sympathetic nerve activity that constricts the systemic vasculature and also evokes parallel inotropic and chronotropic effects on the heart to increase cardiac output. The metaboreflex elicits a significant blood pressure elevating response during exercise and functions to redistribute blood flow and blood volume. Regional specificity in the efferent response to the metaboreflex activated from either the leg or the arm is seen in the balance between signals for vasoconstriction to curtail blood flow and signals to increase cardiac output. The metaboreflex has dual functions. It can both elevate and decrease muscle blood flow depending on (1) the intensity and mode of contraction, (2) the limb in which the reflex is evoked, (3) the strength of the signal defined by the muscle mass, (4) the extent to which blood flow is redistributed from inactive vascular beds to increase central blood volume and (5) the extent to which cardiac output can be increased


 the pic shows  a  info from our " archive" from many  years back, when we introdcued the smallest lab in the world during an annual ACSM  meeting in Denver Colorado.
 Where we successfull.?
 No not at all.
 Most people had   no clue what a Spior Tiger  is. , nor did they recogniced NIRS  ( Portamon )   and now MOXY as a tool  for  some interesting applications.
 Physio flow as  a noninvasive method of cardiac hemodynaminc  left many with a sad smile on their face, but everybody was jumping on a 2 and 4 mmol lactate idea  andf lactate pro  as well the great idea to be able to test for VO2  max. Hmmm perhaps time  can change ? What do you think ?

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