My son (16) is a cross country runner and he is struggling with his legs getting heavy and going numb during a run. He is conditioned with 400 miles this summer. His at rest heart rate at rest is 64. When trying to run a 8 minute mile (pretty slow for him) - he cannot even run a mile without this occurring...his heart rate goes to about 160-170 then his legs start hurting? Any ideas...his trainer and doctor are pretty stumped. This does not happen when he sprints (HR 130) or runs stadium steps (HR 130).
Hello, I have gone through your query. Thanks for using Chat Doctor. Actually he has got exaggerated phototropic response to exercise. He should be investigated by ECG, Echo and exercise treadmill test. If needed he should get Doppler examination of peripheral vessels of lower limb, My best wishes Chat Doctor.