A temporary performance boost that you then pay the price for? This is absolutely not the case. Altitudream.com has helped many athletes to improve their performance with the help of a high altitude tent.
Athletes have never reported to us any negative effects of the height tent that may or may not have been expressed in the longer term. On the contrary, the improved oxygen efficiency of the body also appears to remain present in the longer term. For example, many athletes indicated that long after their blood levels returned to normal, they still noticed that their 'smoother' breathing had remained.