As background, I am a teenager and very fit. (I exercise intensely for 30-60 minutes 5 out of 7 days of the week.)
I am pretty sure that my legs suffer from poor blood circulation, so I am wondering how much of an effect this has on my running ability (long distance particularly), and whether I could be noticing any of the effects.
My family has a history of poor circulation in the legs unrelated to obesity or any other pre-existing conditions. My grandfather has a bad case of varicose veins in the legs, and my parent descended from him also complains of similar issues with leg veins.
I am fairly certain that I have inherited circulation issues from these ancestors to some degree, as I have noticed a few symptoms. First of all, my feet always turn purple after I stay in the same position for a while; whether that is sitting or standing, my feet consistently turn purple and become numb after a while (unlike my other extremities).
However, the biggest sign of circulation issues I think I have noticed is when I am actually running. Despite having a fairly severe case of asthma and living at an elevation of 5000 feet, my first signs of tiredness when running are always burning or exhausted legs. The reason I am not completely sure whether or not this is a sign of circulation issues is because I don't know whether or not it is actually normal for people to always tire in their legs first. But either way, the point is that I never actually run out of breath (except in rare cases) because my legs always give way first.
So my questions are: firstly, am I noticing signs of poor circulation when running, or can we even be sure that I have circulation issues in the legs? Secondly, to what degree could this be effecting my running ability (I sense that I lack stamina relative to my training regime and the effort I put in to running)? Finally, an optional question I have is, how can I best deal with these issues? Assuming I have circulation issues in the first place, is there a way to deal with them for a runner?
Thank you for help.