title: Chronoendocrinological studies in athletes. Circadian rhythms of HGH and IRI.
abstract: The serum concentrations of HGH and IRI studied over a 24-hour span in 83 healthy athletes under normal rest conditions in a normal living environment show statistically significant rhythms, validated and quantified by cosinor analysis; for each hormone three different types of the circadian rhythm (with a peak of acrophase between: 6.30 a.m. and 1.30 p.m., 1.30 p.m. and 10.30 p.m., 10.30 p.m. and 6.30 a.m.) were observed. The IRI response to a meal load underwent cyclic variations during the day.
mesh_terms: D002940:Circadian Rhythm; D005260:Female; D013006:Growth Hormone / Q000097:blood*; D006801:Humans; D007328:Insulin / Q000097:blood*; D008297:Male; D005082:Physical Exertion; D011863:Radioimmunoassay; D013178:Sports Medicine
chemical_list: D007328:Insulin; D013006:Growth Hormone