Peptide and glycoprotein hormones and sport
Human growth hormone (hGH) is one of the major hormones inﬂuencing growth and development in humans. Such is the complexity of human growth, a period extending from birth to the age of 20 years, that a very large number of hormones inﬂuence it, producing many complex interactions. Besides hGH, the hormones, testosterone, oestradiol, cortisol, thyroxine and insulin have important roles at different stages of growth and development. The exact role of hGH is difﬁcult to evaluate exactly, because of the many different developmental and metabolic processes which hGH can inﬂuence.