Article Text

Relationship between corticotrophin and endorphin responses to a single bout of competitive swimming
  1. L Carrasco,
  2. I C Martínez-Díaz,
  3. M de Hoyo,
  4. B Sañudo
  1. Department of Physical Education and Sport, University of Seville, Ciudad Jardín Avenue, 20-22, E-41005 Seville, Spain


The aims of this investigation were to determine the corticotrophin (ACTH) and endorphin (END) responses to a single bout of competitive swimming exercise and to examine the relationship between them. Plasma ACTH and ENDs concentrations were determined in 13 male swimmers at three time points: basal conditions, and before and after swimming competition (100 m freestyle). The results showed an END response to precompetition stress, since an increase in END plasma levels was observed (from 36.3±2.9 pg/ml assessed in basal conditions to 51.8±3.2 pg/ml, p≤0.01). However, ACTH plasma levels remained unchanged at this time-point (10.1±0.9 pg/ml and 10.9±1.2 pg/ml for basal conditions and precompetition respectively). After competitive swimming effort ACTH and END levels rose significantly, reaching values of 39.4±5.2 pg/ml and 128.6±18.1 pg/ml for ACTH and END, respectively, and showing statistical differences with precompetition (p≤0.001) and basal condition levels (p≤0.001). Significant correlations were found between ACTH and END levels both in precompetition (r=0.647; p≤0.05) and in postcompetition (r=0.725; p≤0.01). It is concluded that single bout of competitive swimming induces a psychological and physiological stress which stimulates the same pattern of response for ACTH and END.

Statistics from

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.