Respiratory pandemics set off several new trends

'It is believed that there is nothing like sports and exercise to improve your health and breathing yet this advice may be wrong as it is recently being proven that intensive exercise may be bad for your lungs; many top Olympic athletes' health stats are showing there is no longer any doubt that an alarming proportion of athletes experience that too much training ends up becoming very bad for their breathing..' (Science Daily) 

Physical activity is more likely to cause asthma in winter because air temperature plays a crucial role as cold air is also saturated with vapor (major water and heat loss occurs through the heavier breathing required by the athlete's activity) in a temperate environment of 27° Celsius the air breathed by an athlete undergoing intensive training is gently warmed as it enters the airways but when ice-cold air is breathed in (the air inhaled due to increased concentration of ionic components in the fluids of the airway mucosa) a mediator release occurs from certain cells in the respiratory tract, causing airway inflammation..