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Juerg Feldmann

Fortiori Design LLC
Posts: 1,530
Thanks for that question. This is a really nice question and shows, how  readers start to think in our direction.
 Would we recommend  MOXY rather for endurance athletes or for  strength and local  muscle group workouts.

This is a very old question, when we look at the classical ideas of testing  with lactate and VO2.
 The lag time and  as well the reaction of VO2  due to involvement of  a bigger muscle mass in endurance  exercises like cross country skiing and other the  testing with classical ideas creates many big problems.
 Here an old abstract to  show you that dilemma.

Determinants of oxygen uptake. Implications for exercise testing.


Department of Kinesiology, Kansas State University, Manhattan, USA.


For exercise modalities such as cycling which recruit a substantial muscle mass, muscle oxygen uptake (VO2) is the primary determinant of pulmonary VO2. Indeed, the kinetic complexities of pulmonary VO2 associated with exercise onset and the non-steady state of heavy (> lactate threshold) and severe [> asymptote of power-time relationship for high intensity exercise (W)] exercise reproduce with close temporal and quantitative fidelity those occurring across the exercising muscles. For moderate (< lactate threshold) exercise and also rapidly incremental work tests, pulmonary (and muscle) VO2 increases as a linear function of work rate (approximately equal to 9 to 11 ml O2/W/min) in accordance with theoretical determinations of muscle efficiency (approximately equal to 30%). In contrast, for constant load exercise performed in the heavy and severe domains, a slow component of the VO2 response is manifest and pulmonary and muscle VO2 increase as a function of time as well as work rate beyond the initial transient associated with exercise onset. In these instances, muscle efficiency is reduced as the VO2 cost per unit of work becomes elevated, and in the severe domain, this VO2 slow component drives VO2 to its maximum and fatigue ensues rapidly. At pulmonary maximum oxygen uptake (VO2max) during cycling, the maximal cardiac output places a low limiting ceiling on peak muscle blood flow, O2 delivery and thus muscle VO2. However, when the exercise is designed to recruit a smaller muscle mass (e.g. leg extensors, 2 to 3kg), mass-specific muscle blood flow and VO2 at maximal exercise are 2 to 3 times higher than during conventional cycling. consequently, for any exercise which recruits more than approximately equal to 5 to 6kg of muscle at pulmonary VO2max, there exists a mitochondrial or VO2 reserve capacity within the exercising muscles which cannot be accessed due to oxygen delivery limitations. The implications of these latter findings relate to the design of exercise tests. Specifically, if the purpose of exercise testing is to evaluate the oxidative capacity of a small muscle mass (< 5 to 6kg), the testing procedure should be designed to restrict the exercise to those muscles so that a central (cardiac output, muscle O2 delivery) limitation is not invoked. It must be appreciated that exercise which recruits a greater muscle mass will not stress the maximum mass-specific muscle blood flow and VO2 but rather the integration of central (cardiorespiratory) and peripheral (muscle O2 diffusing capacity) limitations.

Now  with MOXY this dilemma is solved.
 We test local and have a local information immediately  for  small muscle group testing.
. We test local but get  in combination with the central control a direct information, when the CG kicks in  and  therefor  will start to limit the optimal  ATP production in   the local area.
 Remember the idea we created with delivery problem versus utilization problem.
 That is exactly what we talk about.
 Any new MOXY user will see, that when loading  for an endurance test the SmO2  level  will be never as low   ( never say never )  but most often unlikely that low ,as when you load that muscle individually  and all out.
 This shows you , that there is a local " storage of O2  Hb and Mb  which allows a much deeper deoxygenation in a local work out than in an endurance workout, where the limitation of desaturation is often created by   a delivery or utilization problem due to delivery limitation.
  We will for sure get   much deeper into this utilization limitation as there are two main reason for lack of utilization. A structural   reason and a function ( structural ) reason.

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