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o_brazanski
lactate
How much time does it need to past until the lactate appears, to the moment when it enter into the systematic bloodstream and it can be measurable?
Asked by o_brazanski - 2 answers - 1 year 4 weeks ago
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alan_ruddock
Lactate is present in your blood stream at rest. Usually about 0.5 - 1.5 mmol/L. The time it takes for lactate to form and then appear in blood is difficult to measure, consequently there is no data that I am aware of quantifies this time. Blood lactate samples are usually taken at the ear lobe or finger and is therefore dependent on cardiac output. Lactate production will vary depending on the individual and type of exercise.
Hope that helps
Alan
Submitted 1 year 4 weeks ago by alan_ruddockNeilLCook
As Alan mentioned, some amount of Lactate is always in the body. It is part of the Krebs Cycle of energy production. As long as there is time and oxygen to complete the Krebs Cycle the lactates do not accumulate beyond the base level.
Duration and intesity of effort will increase the levels of lactate in the blood.
There are a number of kits available to sample blood and measure lactates. But, there is some research that questions the value and accuracy.
Taking blood from the ear lobe or finger, as is typically done, has been questioned as to it's accuracy. Since the important point is the level of lactates in the exercising muscle, not in other areas of the body. In addition, lactate levels are a trailing indicator of effort. Measuring gas exchange is considered a leading indicator of work effort. That is - the level of O2 and CO2 in the expired air lead the work effort, while the level of lactate in the blood trails the work effort. So, taking HR at the delection of O2/CO2 levels will be more accurate in identifying threshold point, than blood lactate leveling.
In addition, you need to build a profile for an athlete's blood lactate, since there is no standard blood lactate level that indicates effort threshold. That requirement is not true for O2/CO2 ratios.
nlc
Submitted 49 weeks 3 days ago by NeilLCook