This title is directed primarily towards health care professionals outside of the United States. Children are not mini-adults. They are growing and maturing at their own individual rates and their physiological responses to exercise are dependent on a large number of variables as they progress through childhood and adolescence into adult life. Understanding has been limited by the fact that measurement techniques and equipment developed for use with adults are often not appropriate or even ethical for use with young people. These issues are addressed in this book which provides an analysis of physiological responses to exercise in relation to age, growth, maturation and sex.