The influence of cardiorespiratory fitness on the tolerance to physical exertion of schoolchildren

Abstract

Cardiorespiratory fitness in childhood is a key marker of health. Scientists of the American Heart Association (AHA) consider that the cardiorespiratory fitness (CRF) refers to the capacity of the circulatory and respiratory systems to supply oxygen to skeletal muscle mitochondria for energy production needed during physical activity. The results of a study by Finnish scientists confirm that physical activity is significant for the cardiorespiratory fitness of teenagers. Besides, higher lever of physical activity is more useful for overweight teenagers.