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      Plasma Oxytocin during Intense Exercise in Professional Cyclists

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          Aims: This study was designed to explore the plasma oxytocin (OT) response to exercise until exhaustion in trained male cyclists. Methods: Twelve professional cyclists (EXP group; age: 26 ± 2 years; VO<sub>2</sub>max: 4,804 ± 549 ml) and 10 sedentary young men (CONT group; age: 23 ± 2 years; VO<sub>2</sub>max: 3,146 ± 602 ml) performed a maximal incremental exercise test on a cycle ergometer. Evaluation was made of the oxygen uptake (VO<sub>2</sub>) and concentrations of blood lactate and plasma OT immediately before, during and immediately after the tests, respectively. Results: Significant increases (p < 0.01) related to exercise were recorded in VO<sub>2</sub> and lactate concentration within each group, while no such changes were observed in OT levels. OT values, on the other hand, were significantly lower (p < 0.01) in EXP than in CONT throughout the tests. Conclusion: It was concluded that plasma OT shows no response to graded exercise until exhaustion in professional cyclists.

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          Suppression of hypothalmic-pituitary-adrenal axis responses to stress in lactating women

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            Vasopressin and oxytocin—their role in neurotransmission

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              Author and article information

              Horm Res Paediatr
              Hormone Research in Paediatrics
              S. Karger AG
              03 September 2001
              : 55
              : 3
              : 155-159
              aDepartamento de Enfermería, and bUnidad de Investigación en Fisiología del Ejercicio, Universidad Complutense de Madrid; cAgrupación Deportiva Banesto; dDepartamento de Toxicología y Legislación Sanitaria, Universidad Complutense de Madrid, and eDepartamento de Ciencias Morfológicas y Fisiología, Universidad Europea de Madrid, Spain
              49988 Horm Res 2001;55:155–159
              © 2001 S. Karger AG, Basel

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              Figures: 1, Tables: 1, References: 30, Pages: 5
              Original Paper


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