FUNCTIONAL EVALUATION SECTION   

Medicina dello Sport 1999 March;52(1):41-7

Copyright © 1999 EDIZIONI MINERVA MEDICA

language: English

Effect of acute treadmill exercise on hormonal changes in 15-17 years-old female middle-distance runners. Significance of phase of the ovarian-menstrual cycle

Szczepanowska E. ¹, Rychlewski T. ¹, Viru A. ²

¹ Department of Human Physiology, University School of Physical Education, Poznam, Poland; ² Institute of Exercise Biology, University of Tartu, Estonia

The ­study was con­duct­ed in ­order to ­test the pos­sibil­ity ­that ovar­ian-men­stru­al ­cycle (OMC) ­results in a mod­ula­to­ry fac­tor for exer­cise-­induced hor­mo­nal chang­es in ­females of fer­tile age. An incre­men­tal tread­mill ­test was per­formed by 18 ­female mid­dle-dis­tance run­ners of age 15 to 17 ­years. The ­girls ­were divid­ed ­into fol­lic­u­lar (F) and ­luteal (L) ­groups accord­ing phas­es of OMC dur­ing the experi­ment. The exer­cise ­caused and aci­do­sis (pH ­dropped to 7.16±0.07 and 7.15±0.08, respec­tive F and L ­group). β-estrad­i­ol, lutro­pin and pro­lac­tin lev­els ­increased ­only in L ­group and pro­ges­te­rone ­only in F ­group. Cortisol and tes­tos­te­rone con­cen­tra­tions ­increased in ­both ­groups. Both pre- and post­ex­er­cise lev­els of cor­ti­sol as ­well as of insu­lin ­were high­er in ­luteal ­than fol­lic­u­lar ­phase. The ­obtained ­results sup­port the con­ten­tion ­that a mod­ula­to­ry fac­tor aris­es ­from OMC for hor­mo­nal chang­es in exer­cise.