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Ann Nutr Metab. 2008;52(4):261-6. doi: 10.1159/000140517. Epub 2008 Jul 10.

Ramadan fasting and the GH/IGF-1 axis of trained men during submaximal exercise.

Author information

1
Institut Supérieur du Sport et de l'Education Physique, Gafsa, Tunisia. ezebouhlel@yahoo.fr

Abstract

AIMS:

The aim of this study was to explore possible changes in body composition, blood glucose regulation, plasma growth hormone (GH), insulin-like growth factor 1 (IGF-1), insulin-like growth factor-binding protein-3 (IGFBP-3), and insulin concentrations of trained athletes in response to the intermittent fasting and dehydration of Ramadan observance.

METHODS:

Nine trained male rugby players (age 19 +/- 2 years, height 1.78 +/- 0.74 m) were tested 3 times: before Ramadan (C), at the end of the first week (R1), and during the fourth week (R2). They performed a progressive cycle ergometer test at each visit. The work rate was increased in 6-min stages corresponding to 20, 30, 40, 50 and 60% of W max. Substrate oxidation was evaluated by indirect calorimetry. On each occasion, substrate and plasma hormone concentrations were measured at rest and at the end of the exercise.

RESULTS:

Ramadan fasting induced a significant decrease in body mass and body fat (R2 vs. C, p < 0.001). Plasma concentrations of glucose, insulin, GH, IGF-1 and IGFBP-3 did not change significantly between C and R2, either at rest or following exercise.

CONCLUSION:

Ramadan fasting induces positive changes in body composition without disturbing glucose regulation or activity of the GH/IGF-1 system.

PMID:
18617733
DOI:
10.1159/000140517
[Indexed for MEDLINE]

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