Plasma testosterone and cortisol responses to prolonged sculling in male competitive rowers.
In this study, we examined anabolic and catabolic hormone responses to a single endurance rowing training session in 12 male competitive single scull rowers. A work intensity eliciting a blood lactate concentration of 4 mmol(-1) was determined on a rowing ergometer during an endurance rowing training session lasting about 2 h (7891+/-761 s; distance covered 22.6+/-2.5 km; heart rate 136+/-7 beats x min(-1); intensity 77.4+/-3.8% of anaerobic threshold; mean +/- s). Venous blood samples were obtained before and after on-water rowing. Cortisol, testosterone and sex hormone binding globulin were measured and free testosterone and the free testosterone: cortisol ratio calculated. Blood lactate concentration did not change significantly during training (from 1.7+/-0.4 to 1.9+/-0.4 mmol x l(-1)); however, body mass was reduced (from 82.0+/-10.8 to 80.6+/-11.2 kg) and was related to the distance covered (r = -0.75). The concentrations of cortisol and testosterone did not change significantly during rowing or in the first 2 h of recovery. Free testosterone was reduced in the first 2 h of recovery, but no significant changes were observed in the free testosterone: cortisol ratio. Immediately after rowing, the concentrations of cortisol (r = 0.49) and free testosterone (r = -0.58) were related to the distance covered. Our findings indicate that a prolonged low-intensity training session results in a similar anabolic and catabolic hormone stimulus for trained rowers.
Jürimäe
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Institute of Sport Pedagogy, University of Tartu, Estonia. jaakj@ut.ee
Jürimäe
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Purge
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D000293:Adolescent; D000328:Adult; D016552:Ergometry; D015444:Exercise / Q000502:physiology*; D012739:Gonadal Steroid Hormones / Q000097:blood; D006801:Humans; D006854:Hydrocortisone / Q000097:blood* / Q000378:metabolism; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010807:Physical Endurance / Q000502:physiology*; D012738:Sex Hormone-Binding Globulin / Q000378:metabolism; D018709:Statistics, Nonparametric; D013739:Testosterone / Q000097:blood* / Q000378:metabolism; D013997:Time Factors
D012739:Gonadal Steroid Hormones; D012738:Sex Hormone-Binding Globulin; D019344:Lactic Acid; D013739:Testosterone; D006854:Hydrocortisone