Are there altitude related problems in the Sierra Nevada?

[El Perro Negro]

We have, in reality, had very few instances where AMS has resulted in having to bring somebody down to a lower level. When that has been the case, they have recovered immediately on getting to lower ground and have had no further problems.

These mountains have much high ground over 3000m, but provided that the advice above is followed, ie go slow, then the altitude effects are lessened considerably. On countless occasions we have parked the car at 2500m (having driven up in 1hr from 650m!) and someone has gone off too quick. It is very tempting! Take it very easy, a snails pace, especially for the first 30 minutes after leaving the car.

We find that in that time our body adjusts better and we can then continue a little more rapidly. However, we live and train here in these mountains. Those coming straight in from sea level will find it harder.