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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
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.