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.
Division of Biochemistry and Molecular Biology, School of Life Sciences, Faculty of Science, Australian National University, Canberra A.C.T.
A B
AB
Gray
R D
RD
Telford
M J
MJ
Weidemann
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