One of the ways employed to investigate the intensity of the effort made by a person is the analysis of lactic acid in the blood, but there is some divergence of time regarding what to expect after the effort to collect blood.
Mario, depends on the kind of exercise (I mean Intensity). If we consider an exercise lasting few minutes and at 'maximal' intensity (great anaerobic energetic contribution), you could expect the peak blood values occur after 5 minutes of end of exercise. Sometimes, the peak value could occur after 10min in some individuals. This 'delay' happens due to the transportation from muscle to blood stream. In this kind of exercise we take samples at the first minute, then every 2 min (minutes 3,5,7,9,11 after ending), in order to detect the peak value.
If the intensity was not maximal, the peak blood lactate occurs at the end of exercise. Hope to help.
Ok Ricardo. I will investigate the blood lactate level after a submaximal exercise (six minutes walk test in COPD) and your information is very good. Then, I think one minute after the effort is a good moment, ok? I think Im sure now! Thank you!!!
Yes Mario. In this case, one minute after is perfect. abraço
depends on intensity. Usually after maximal exercise lactate may increase up to three, five or seven minutes depending on if its an athlete or not. I suggest you to measure immediatly aftr the 6MWT, I don't expect a hughe increase in lactate concentration in this protocol with COPD patients, and also it is almost at constant workload. Good luck.
3 and 5 minutes after exercise is good time for correct results.. Its dependig on exercise intesity and individual differences..
According to our experience mainly with coronary heart disease patients, also with heart failure, and performing evaluations trhough spiroergometry, the highest peak value of lactic acid was observed 4-5 minutes after the end of the exercise (peak exercise). Of course this level depends of the exercise intensity; in our patients we used symptom-limited exercise tests with an electronical treadmill.
As stated previously it depends on the sport/exercise. It is also affected by the persons effort obviously. In boxing for example it is not unusual for the boxer to be past peak BLC before or just after the end of their fight as they have had the chance to take the end of the round easy because they know they have won the fight (eg Davis et al 2013). There for it is important to take a blood sample at time-zero then every 60-to-30 sec after depending how accurately you wish to pinpoint the 'peak' time. It must be remembered that the blood lactate only reflects a percentage of the total BLC, and is effected by the persons muscle composition, intra-cellular buffering capacity as well as their abundance of mono-carboxylate-transporters 1 and 4 used for cellular exchange.
The intensity is the main reason that the blood collection may differ. Usually after a maximal exercise (up to 90% or 2RM) the peak blood lactate concentration could be escalate up to the fifth or seventh minute. In a study, the procedure that scientists follow includes blood sampling from 3rd to 9th minute, to comprise the peak concentration and the lactate removal.
You can also refer to this exellent literature reference of Dr. Vassilis Mougios
http://www.amazon.com/Exercise-Biochemistry-Vassilis-Mougios/dp/0736056386
Thanks for your information. It was very important to me in my actual investigation with COPD patients.
Dear Mario, sorry i'm bit late in my response. but according to our data the peak blood lactate reaches at 3 min after progressive maximal exercise (shuttle run test) in active sportsmen. since our next period was at 8 min which is lower than 3rd min. we assume that peak blood lactate reaches some where between 3rd and 8th min after a maximal exercise. I also agree with all others that it depend on intensity of exercise and population being measured. I've attached article for your reference
Dear Mario, it´s my pleasure to briefly explain you our experience in this aspect. We usually have tested patients after cardiovascular diseases, mainly ischemic heart disease and have evaluated them in a treadmill through a submaximal or maximal symptom-limited exercise stress test. After the end of the exercise we have taken blood samples for lactate determinations in the minutes 1, 3, 5 and 10. We have reached the peak value in the 5th minute after a maximal exercise and in the 1st minute after a submaximal exercise. So, it looks that the ideal time to precise the peak value of lactic acid depends of the exercise intensity. Good luck!
Hello Mario! In Russian Rowing Team we are collecting blood for lactic acid analysis during 3th minut after high-intensity exercise. In case of moderate or low intensity exercise - during 2th minut.
Hello. Follow this article:
Blood lactate concentration following maximum exercise in trained subjects.
G. C. Gass, S. Rogers, and R. Mitchell
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