What 2,088 to 3,346 metres does to your first day

As elevation rises, air pressure falls and each breath delivers less oxygen. At 3,000 m that reduction is meaningful compared with sea level.

The body responds by breathing faster and raising heart rate, which means you work harder to produce the same effort. The practical result is that the same descent feels more tiring than it would at home.

This is not a fitness issue. A very fit person experiences the same effect on day one; what differs is how quickly they adapt over the following days.

Air at altitude is dry, and you lose water to evaporation with every breath. Faster breathing compounds that loss.

The second problem is that cold suppresses thirst. You do not feel thirsty while you are steadily losing fluid, and those two together produce dehydration you never notice developing.

The first signs are usually a headache and fatigue arriving earlier than expected. For most skiers who fade in the first afternoon of a trip, this is the cause rather than the skiing itself.

Mild symptoms are common and usually pass within a day or two: headache, slight nausea, disturbed sleep and breathlessness. These are part of the body adjusting.

If symptoms worsen or fail to clear, losing elevation is the answer. At Erciyes that is straightforward — dropping to a lower gate or returning to the city both work, and the city is close.

Severe headache, vomiting, loss of balance or confusion are serious signs requiring immediate descent and medical help. This is rare at ski-resort elevations but worth recognising.

The atmosphere filters part of the ultraviolet spectrum, and that filtering weakens as you climb. The snow surface then reflects a large share of what gets through straight back up.

The result is that sunburn and eye damage develop far faster than most visitors expect. Protection is needed on overcast days too, because UV passes through thin cloud.

Eye protection is not optional. Prolonged unprotected exposure on snow at altitude can cause snow blindness, whose symptoms appear hours later with no warning during exposure.

The body begins adjusting within a few days: oxygen-carrying capacity rises and breathing settles. Days two and three are usually noticeably easier than day one.

That is why trying to use the first day at full capacity is counterproductive on a week-long trip. Starting light buys you six better days.

Erciyes's proximity to the city helps here. Sleeping at a lower elevation eases adaptation, and staying in Kayseri does that automatically — a version of the mountaineering principle of working high and sleeping low.

Keep the first day short. Three or four hours of actual skiing is enough coming from sea level, and the following day will be markedly more comfortable for it.

Drink regularly rather than waiting for thirst. A small amount every hour is a simple habit that changes how the end of the day feels.

Avoid alcohol on the first evening. It increases dehydration and degrades sleep quality, and both slow the adjustment your body is trying to make.

Children are affected by elevation in the same way adults are, but they are less able to describe what they are feeling. A child who becomes unusually irritable or unwilling to continue may be feeling the altitude rather than simply being difficult.

Dehydration develops faster in children too, and they are even less likely to ask for water when it is cold. Offering drinks on a schedule rather than on request is the practical answer.

Sun and eye protection matter more, not less, for children: their skin and eyes are more sensitive, and snow blindness develops faster in them than in adults.