At sea level, artificial environment can be created by decreasing the partial pressure of oxygen by enriching the air with inert nitrogen. The barometric pressure of air in this artificial environment remains same at 760 millimeters mercury. This is called the normobaric condition. The physiological response of the athlete is dependent primarily on the partial pressure of inhaled oxygen. Research establishes that ventilatory and hematological responses to the simulated environment of high altitude were identical irrespective of the method of reduction of partial pressure (hypobaric hypoxia) or concentration of oxygen (normobaric hypoxia). The condition of enriched oxygen at high altitudes (hypobaric hypoxia) was also tried on the athlete simulating the sea level conditions.