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The Journal of Sports Medicine and Physical Fitness 2001 March;41(1):73-7


language: English

Responses of blood hormones to the maximal rowing ergometer test in college rowers

Jürimäe J., Jürimäe T.

From the Institute of Sport Pedagogy University of Tartu, Tartu, Estonia


Background. The pur­pos­es of ­this ­study ­were to inves­ti­gate the rest­ing lev­els and the ­acute hor­mo­nal ­response of ­total tes­tos­te­rone (Ttot), ­free tes­tos­te­rone (Tfree), cor­ti­sol (C) and Tfree:C ­ratio to the 6-min­ute “all-out” row­ing ergom­e­ter ­test.
Methods. Experimental ­design: cross-sec­tion­al ­study to inves­ti­gate the respons­es of ­blood hor­mones to the max­i­mal row­ing ergom­e­ter ­test in col­lege row­ers. Participants: ­eight col­lege lev­el ­male row­ers (22.0±2.8 yrs, 191.8±4.1 cm, 85.4±4.3 kg, BMI: 23.2±1.3 kg·m-2) ­took ­part in ­this inves­ti­ga­tion. Interventions: a grad­ed exer­cise ­test at the inten­sities of 150, 200 and 250 W (6-min­ute ­each) and a 6-min­ute “all-out” ­test on a row­ing ergom­e­ter (Concept II, Morrisville, USA) ­were per­formed at sep­ar­ate meas­ure­ment ses­sions. Measures: ­heart ­rate (HR) was record­ed at the end of ­each ­load dur­ing a grad­ed exer­cise ­test. Individual phys­i­cal work­ing capac­ity of row­ers was cal­cu­lat­ed at the max­i­mum HR record­ed dur­ing a 6-min­ute “all-out” ­test. Venous ­blood sam­ples ­were ­obtained 3 min­utes ­before and imme­di­ate­ly ­after the 6-min­ute “all-out” ­test to deter­mine the con­cen­tra­tion of Ttot, Tfree, Tfree:C ­ratio, glu­cose and lac­tate (LA) in ­blood.
Results. Mean pow­er was 354.3±26.8 W and HR 190.9±5.1 ­beats·min-1 dur­ing the “all-out” ­test. Mean ­blood LA con­cen­tra­tion at the end of the “all-out” ­test was 13.46±1.44 ­mmol·l-1. The “all-out” ­test on the row­ing ergom­e­ter did not ­change sig­nif­i­cant­ly the con­cen­tra­tion of Ttot (­before: 17.54±4.34; ­after: 20.03±4.80 ­nmol·l-1), Tfree (­before: 0.423±0.111; ­after: 0.436±0.112), C (­before: 477.50±119.34; ­after: 477.63±132.51 ­nmol·l-1) and Tfree:C ­ratio (­before: 0.922±0.282; ­after: 0.973±0.320×10-3). The trans­for­ma­tion of ­these hor­mone val­ues to ­effect siz­es (ES) dem­on­strat­ed ­that “all-out” ­test ­only mod­er­ate­ly (ES<0.61) influ­enced ­these hor­mone lev­els. Significant rela­tion­ships ­were ­observed ­between the rest­ing lev­els of Ttot and Tfree, and ­mean pow­er of the 6-min­ute “all-out” ­test (r=0.65 and r=0.86, respec­tive­ly). There was a non-sig­nif­i­cant ­increase in the lev­el of Ttot fol­low­ing the “all-out” row­ing ergom­e­ter ­test ­which was sig­nif­i­cant­ly relat­ed to ­mean pow­er (r=0.73) and cov­ered dis­tance (r=0.67).
Conclusions. The ­results sug­gest ­that ­there are no sig­nif­i­cant chang­es in hor­mone lev­els dur­ing a 6-min­ute “all-out” row­ing ergom­e­ter ­test. However, row­ing per­for­mance is pos­i­tive­ly relat­ed to the rest­ing val­ues of Ttot and Tfree, and the non-sig­nif­i­cant chang­es in Ttot lev­el fol­low­ing a 6-min­ute “all-out” ­test.

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