The IGF-I/cortisol ratio as a useful marker for monitoring training in young boxers

S Nassib; W Moalla; S Hammoudi-Nassib; M Chtara; Y Hachana; Z Tabka; K Chamari; M Elloumi

doi:10.5604/20831862.1180172

eISSN: 2083-1862
ISSN: 0860-021X

Biology of Sport

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1/2016
vol. 33

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abstract:

Original paper

The IGF-I/cortisol ratio as a useful marker for monitoring training in young boxers

S Nassib

^{1, 2}

,

W Moalla

³

,

S Hammoudi-Nassib

^{1, 2}

,

M Chtara

^{1, 2}

,

Y Hachana

²

,

Z Tabka

⁴

,

K Chamari

⁵

,

M Elloumi

^{2, 4, 6}

Research Laboratory, “Sport Performance Optimisation”, National Centre of Medicine and Science in Sports, Tunis, Tunisia
University of Manouba, ISSEP, Ksar-Saïd, Tunisia
University of Sfax, High Institute of Sport and Physical Education Sfax, Research Unit EM2S, Sfax, Tunisia
University of Sousse, Laboratory of Cardio-circulatory, Respiratory, and Hormonal Adaptations to Muscular Exercise, Faculty of Medicine Ibn El Jazzar, Sousse, Tunisia
Athlete Health and Performance Research Centre, ASPETAR, Qatar Orthopaedic and Sports Medicine Hospital, Qatar
Blaise Pascal University, EA 3533: AME2P, Clermont-Ferrand, France

Biol. Sport 2016;33:15-22

DOI: https://doi.org/10.5604/20831862.1180172

Online publish date: 2016/01/13

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Training effects on plasma insulin-like growth factor-1 (IGF-1)/cortisol ratio were investigated in boxers. Thirty subjects were assigned to either the training or the control group (n=15 in both). They were tested before the beginning of training (TO), after 5 weeks of intensive training (T1), and after 1 week of tapering (T2). Physical performances (Yo-Yo intermittent recovery test level-1), training loads, and blood sampling were obtained at T0, T1, and T2. Controls were only tested for biochemical and anthropometric parameters at T0 and T2. A significantly higher physical performance was observed at T2 compared to T1. At T1, cortisol levels were significantly increased whereas IGF-1 and insulin-like growth factor binding protein-3 (IGFBP-3) levels remained unchanged compared to baseline. At T2, cortisol levels decreased while IGF-1 and IGFBP-3 levels increased. The IGF-1/cortisol ratio decreased significantly at T1 and increased at T2, and its variations were significantly correlated with changes in training loads and Yo-Yo intermittent recovery test level 1 (IRT1) performance over the training period. Cortisol variations correlated with changes in training load (r=0.64; p<0.01) and Yo-Yo IRT1 performance (r=O.78; p<0.001) at T1 whereas IGF-1 variations correlated only with changes in Yo-Yo IRT1 performance at T2 (r=0.71; p<0.001l. It is concluded that IGF-1/cortisol ratio could be a useful tool for monitoring training loads in young trained boxers.

keywords:

The IGF-I/cortisol ratio as a useful marker for monitoring training in young boxers

S Nassib 1, 2 , W Moalla 3 , S Hammoudi-Nassib 1, 2 , M Chtara 1, 2 , Y Hachana 2 , Z Tabka 4 , K Chamari 5 , M Elloumi 2, 4, 6

Training intensity, Hormonal responses, Physiological demands, biochemical factor, Physical performance

S Nassib

^{1, 2}

,

W Moalla

³

,

S Hammoudi-Nassib

^{1, 2}

,

M Chtara

^{1, 2}

,

Y Hachana

²

,

Z Tabka

⁴

,

K Chamari

⁵

,

M Elloumi

^{2, 4, 6}