Question from TOUR reader Andrea Sch.: I always have enormous circulatory problems when descending mountain passes and I don't know where they come from. Going uphill, on the other hand, doesn't cause me any problems and I think I drink enough. But as soon as I go downhill again, my circulation "goes crazy". I feel sick, dizzy and start to shake. So I don't dare to ride any more mountain passes, as this has happened several times before. Do you know any advice?
Answer from Dr Robert Eifler: In principle, the following reasons for your problem are possible: Firstly, it may be due to a short-term reduction in blood flow to the vestibular organs and the brain. The high pulse rate drops very quickly after the end of the ascent, which can result in the symptoms described above. Even if you have a predisposition to low blood pressure, the increase in blood pressure due to exercise will drop sharply immediately after the end of the exercise - with the same consequences.
On the other hand, hyperventilation syndrome could also be a possibility: this means that you maintain the greatly increased breathing rate during the ascent on the descent. This can also lead to dizziness or circulatory problems.
However, it can also be a psychosomatic, anxiety-induced reaction: Insecurities from previously experienced situations when regulating speed, braking or cornering can continue unconsciously and also upset balance and circulation.
In addition to drinking enough fluids, you should also consume sufficient carbohydrates, for example in the form of gels. This will help you avoid hypoglycaemia - a risk that many people still underestimate on long climbs, but which can also be the cause of such problems. If you regularly take medication with a circulatory effect, for example to treat high blood pressure, this can also have the same effect.
