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Original article
IGFBP-3, a sensitive marker of physical training and overtraining
  1. M Elloumi1,
  2. N El Elj2,
  3. M Zaouali2,
  4. F Maso1,
  5. E Filaire1,
  6. Z Tabka2,
  7. G Lac1
  1. 1Laboratoire de Physiologie de la Performance Motrice, Université Blaise Pascal, Bat Biologie B, Les Cézeaux, 63177 Aubière Cedex, France
  2. 2Laboratoire de Physiologie et des Explorations Fonctionnelles, Faculté de Médecine Ibn Eljazzar, 4000 Sousse, Tunisia
  1. Correspondence to:
 Gérard Lac
 Laboratoire de Physiologie de la Performance Motrice, Université Blaise Pascal, Bat Biologie B, Les Cézeaux, 63177 Aubière Cedex, France; Gerard.LACuniv-bpclermont.fr

Abstract

Objective: To investigate the response of the somatotrope axis (insulin-like growth factor-1 (IGF-1), insulin-like growth factor binding protein-3 (IGFBP-3)) to intense exercise in relation to tiredness.

Methods: The study involved 11 rugby players who completed a questionnaire intended to evaluate fitness or, conversely, overtraining and who agreed to plasma samples being taken before and after an international rugby match.

Results: The main finding of our study is that we observed strong negative correlations between IGF-1 (r = 0.652) and IGFBP-3 (r = 0.824) levels and the overtraining state estimated using the French Society of Sport Medicine questionnaire. In particular, there was a fall (of up to 25%) in IGFBP-3 levels after the match in the more fatigued subjects compared to an increase (of up to 40%) in fit subjects.

Conclusions: A fall in IGFBP-3 in response to an intense bout of exercise may represent an index of tiredness in highly trained sportsmen, as indicated by the scores obtained from the overtraining questionnaire.

  • AFC, after the competition
  • BMI, body mass index
  • CV, coefficient of variability
  • G1, group 1
  • G2, group 2
  • GH, growth hormone
  • IGF-1, insulin-like growth factor-1
  • IGFBP-3, insulin-like growth factor binding protein-3
  • SD, standard deviation
  • SFMS, French Society of Sport Medicine
  • IGF-1
  • IGFBP-3
  • overtraining
  • overtraining questionnaire
  • rugby match

https://doi.org/10.1136/bjsm.2004.014183

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    Footnotes

    • Competing interests: none declared