Baisse de l’humidité atmosphérique

par | 23 Fév 2013 | 46 commentaires

humidité atmosphérique

La quantité de vapeur d’eau contenue dans l’air diminue avec l’altitude. A 4000 mètres, la tension de vapeur d’eau ne représente plus que le quart de sa valeur au niveau de la mer. Si on ajoute à cela que le volume d’eau contenu dans l’air est plus faible aux températures basses qu’aux températures élevées, il devient manifeste que l’air qui entoure le montagnard est sec. Cet air sec augmente la déshydratation contre laquelle l’organisme n’a aucune protection. Cet air sec et froid est aussi à l’origine de l’irritation des voies respiratoires et des maux de gorge.

La déshydratation a une conséquence directe sur la performance physique.

Une perte d’eau de 2 % du poids du corps (soit un litre et demi pour 80 kilos) diminue la performance de 20 % !

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