Male, widower, 70, 167 cm, in normal health. Disciplined life style. No smoking, vegetarian, occasional small drinker. I go for comprehensive cardiac health checkups on an annual basis. So far nothing abnormal has been found except the LDL which is slightly above the limit. BMI 21.5. Family history: Two elder brothers severe cardiac patients.
I go for a morning constitutional that comprises a six kilometer walk. I try a bit of running (for several years now) without discomfort. However, I need to open my mouth and breathe while running otherwise I get short of breath very soon, say after some 300 steps. There is no nose-block.
Why is it so?