Endocrine response to intense interval exercise.
This investigation provides an insight into the physiological changes produced, and processes operating, during and after a typical interval exercise training regime. The role of interval exercise in the modulation of the plasma concentration of sex hormone binding globulin (SHBG) and the hormones beta-oestradiol, testosterone, prolactin and growth hormone was assessed. Eight trained male athletes [mean maximal oxygen uptake (VO2max) 64.3 (SD 3.8) ml.kg-1 x min-1, mean age 31.5 (SD 4.5) years] undertook an intense interval exercise (treadmill running) protocol to exhaustion. Subjects completed an average of 15.6 x 1-min runs. This interval protocol produced significant increase in the plasma concentration of SHBG and all four hormones (all P < 0.01) in the immediate post-test period. The plasma concentration of the hormones increased as indicated: beta-oestradiol (45%), testosterone (38%), prolactin (230%), growth hormone (2000%). These hormones have an established capacity to interact with components of many physiological systems and, as such, may provide a mechanism for the changes induced by intense exercise in many of these systems.
Gray
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AB
Division of Biochemistry and Molecular Biology, School of Life Sciences, Faculty of Science, Australian National University, Canberra A.C.T.
Telford
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RD
Weidemann
M J
MJ
D000328:Adult; D004958:Estradiol / Q000097:blood*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D013006:Growth Hormone / Q000097:blood; D006801:Humans; D008297:Male; D011388:Prolactin / Q000097:blood; D011863:Radioimmunoassay; D012738:Sex Hormone-Binding Globulin / Q000032:analysis*; D013739:Testosterone / Q000097:blood*; D013997:Time Factors
D012738:Sex Hormone-Binding Globulin; D013739:Testosterone; D004958:Estradiol; D011388:Prolactin; D013006:Growth Hormone