IGFBP-3, a sensitive marker of physical training and overtraining.
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.
Elloumi
M
M
Laboratoire de Physiologie de la Performance Motrice, Université Blaise Pascal, Bat Biologie B, Les Cézeaux, 63177 Aubière Cedex, France.
El Elj
N
N
Zaouali
M
M
Maso
F
F
Filaire
E
E
Tabka
Z
Z
Lac
G
G
D000328:Adult; D015415:Biomarkers / Q000097:blood; D015992:Body Mass Index; D004032:Diet; D015444:Exercise / Q000502:physiology*; D005538:Football / Q000502:physiology*; D006801:Humans; D018972:Insulin-Like Growth Factor Binding Protein 3 / Q000097:blood*; D007334:Insulin-Like Growth Factor I / Q000378:metabolism*; D010101:Oxygen Consumption / Q000502:physiology; D010806:Physical Education and Training / Q000379:methods; D011594:Psychometrics; D012680:Sensitivity and Specificity; D011795:Surveys and Questionnaires
D015415:Biomarkers; D018972:Insulin-Like Growth Factor Binding Protein 3; D007334:Insulin-Like Growth Factor I