In the practice of sport, the use of nasal band aids to help breathing during physical exertion is quite prevalent. To analyse the possible advantages of its use a revision has been made of investigative books which have studied their efficiency during sporting performance. The results of the research analysed showed that the use of the nasal band aid did not better the consumption of oxygen, breathing, the production of hydrocarbon and the level of exertion measured during the carrying out of physical exertion. Only the level of the anaerobic threshold and the velocity of recovery after the exertion receive some benefit from the use of the band aid. In respect to heart rate and breathing resistance, the results vary, sometimes favourable but others throw doubt on the benefits of its use. Fundamentally the nasal band aid favours nasal breathing in low intensity exertions where one only breaths through the nose, in people with asthma brought on by physical exertion and dusty places.<\/p>\n\n