| 21. | Cholayna s altitude sickness gets worse, as do the travel conditions.
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| 22. | Bad weather and altitude sickness is a real consideration when making this trip.
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| 23. | Part of the difficulty, he said, may have been altitude sickness.
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| 24. | Most, from 70 to 80 percent, fell victim to altitude sickness.
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| 25. | The rail cars have personal oxygen supplies to prevent altitude sickness.
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| 26. | Carlos Monge discovered the clinical syndrome of chronic mountain sickness or altitude sickness.
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| 27. | Most others succumb to altitude sickness or fatigue and turn back.
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| 28. | At about 9, 000 feet, Ayacucho is high enough to cause altitude sickness.
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| 29. | On top of that, the crew began suffering from altitude sickness.
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| 30. | -Remember : Being in great physical condition does nothing to prevent altitude sickness.
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