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Original articles  ENDOCRINOLOGY 

The Journal of Sports Medicine and Physical Fitness 2005 March;45(1):121-6


lingua: Inglese

Hormonal response to maximal rowing before and after heavy increase in training volume in highly trained male rowers

Mäestu J., Jürimäe J., Jürimäe T.

Institute of Sport Pedagogy and Coaching Sciences University of Tartu, Tartu, Estonia


Aim. The aim of ­this ­study was to inves­ti­gate the hor­mo­nal ­response at ­rest and dur­ing max­i­mal 2000 m row­ing ergom­e­ter ­test in 12 high­ly ­trained ­male row­ers ­before and ­after 3 ­week ­heavy train­ing, and ­after 2 ­week taper­ing peri­ods.
Methods. Venous ­blood sam­ples ­were ­obtained ­before, imme­di­ate­ly ­after and ­after 30 min of recov­ery of the row­ing per­for­mance ­test. Testosterone, cor­ti­sol and sex hor­mone bind­ing glob­u­lin ­were meas­ured, and ­free tes­tos­te­rone and the ­free tes­tos­te­rone: cor­ti­sol ­ratio cal­cu­lat­ed.
Results. Mean train­ing ­time was ­about 100% high­er dur­ing the ­heavy train­ing peri­od (17.5 h . week-1) com­pared to the taper­ing peri­od (8.9 h . week-1). Two thou­sand ­meter row­ing ergom­e­ter per­for­mance param­e­ters ­were not dif­fer­ent ­between 3 ­tests. Resting tes­tos­te­rone and cor­ti­sol val­ues ­were not dif­fer­ent ­between 3 ­tests. Three ­week ­heavy train­ing peri­od ­induced sig­nif­i­cant reduc­tions in rest­ing ­free tes­tos­te­rone and ­free tes­tos­te­rone: cor­ti­sol ­ratio. Resting ­free tes­tos­te­rone and ­free tes­tos­te­rone: cor­ti­sol ­ratio ­were ­increased to the pre­train­ing lev­el ­after 2 ­week taper­ing peri­od. A sig­nif­i­cant­ly (p<0.05) low­er max­i­mal exer­cise-­induced ­increase of the ­free tes­tos­te­rone lev­el was meas­ured ­after ­heavy train­ing peri­od. The ­response of cor­ti­sol was ­unchanged and ­free tes­tos­te­rone: cor­ti­sol ­ratio dem­on­strat­ed a ­trend (p>0.05) for a ­decrease ­after ­heavy train­ing peri­od.
Conclusions. Our find­ings indi­cate ­that the ­first ­sign of ­decreased adap­tiv­ity in ath­letes is a ­decreased rest­ing lev­el of ­free tes­tos­te­rone and a low­er max­i­mal exer­cise-­induced ­increase in ­free tes­tos­te­rone con­cen­tra­tion. In addi­tion, ­heavy train­ing ­load high­er ­than 1 000 min per ­week can be sus­tained for 3 ­weeks ­when suf­fi­cient taper­ing peri­od is fol­lowed in high­ly ­trained ­male row­ers.

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