Lactate and Heart rate " paradox "

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: Allow me to give some thoughts about use of heart rate and lactate and perhaps some additional measurement tools in using PC or any other typ of possible training. I am aware that in a short explanation here I will miss a lot of points , but you can add to it and we have again a nice discussion. : Introduction : : 1. Heart rate may be affected by the coordination demand on a sport or the amount of muscle groups involved ( plus by a lot of other reasons like temp, a.s.o. ) I like to limit the thoughts for the moment more on the amount of muscle groups involved. : As you may see on your own body , if you do a sport with a lot of muscle groups involved you may have a realtive high HR but do not feel to bad at all. : Ex. cross country skiing as a full technique. : Now if you do only double pole movements you may have a bit more problem to get your HR up. : Or if we go to cycling. : Testing on a stat. bike with no balance problem and no other challanges than turning your pedal has a different Heart rate responds , as if you bike off road. : Thats why even the best testing equipment in a lab may not give you the real Heart rate values in the field. : So heart rate may actually give a paradox respond in some cases as I will outlinie now. : When we tested people on PC you could see , that at the beginning the heart rates went very high. : Reason : the people like to show that they can do it , so they fight , but not pedal very smooth, but they keep going , so out of the pedal motion they create a " surviveing " motion and include more and more body parts.The amount of muscle groups involved is now big enough to stress the cardio vascular system sufficient to bring the HR up. : It is also big enough that the lactate is getting up there. : Nevertheless the muscle groups who are getting punished the most is still the hip flexor group. : Now there is only so much you can cheat , resp. so much of anaerobic overload your hip flexor will be able to tolerate before he will quite his job. : After a few days completely over reaching this guy has it finally and will not do anything or very little ( Will show later how we try to test this. Now the athlete may not be able to bike anymore at all, and if he still could do a little bit the HR respond will be much lower. Also his lactate respond will be lower. as less muscle groups are involved , less or shorter duration and some other points. Will explain it on the lactate paradox respond idea. : So a lower HR on a relative low wattage and a lower Lactate on the same level as a few days or weeks before , may produce the impression of being : in a better shape cardio vascular and metabolically , when in fact there is a local failure of the hip flexor system : Therefor we use additionally EMG activity together with ammonia ( you could also test urea / harnstoff and in some studies later in the complete overreach situation testosteron / cortisol ratio ) We will come back on this possibility as well. : Now this as a short start to get our brain cells coordinated. : Next up : Lactate and Lactate dynamic in this specific case we are talking about. : Have to go Juerg.

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