Cette étude a un double mérite:
1) Illustrer (une fois de plus) que l'IG des aliments est un concept qui ne s'applique pas aux sportifs
2) Montrer que le sportif a peu de risque de devenir diabétique ce qui coupe l'herbe sous le pied des marchants de peur qui font leur business en clamant que le sportif va devenir diabétique s'il mange des glucides.
Comparing Simple Insulin Sensitivity Indices to the Oral Minimal Model Postexercise
Medicine & Science in Sports & Exercise: January 2016 - Volume 48 - Issue 1 - p 66–72 RYNDERS, COREY
Purpose: This study aims to establish whether changes in indices of insulin sensitivity (Si) derived from fasting glucose and an oral glucose tolerance test (OGTT) are comparable to Si determined by the oral minimal model (OMM) in response to acute moderate-intensity exercise (MIE) and high-intensity exercise (HIE).
Methods: Eighteen prediabetic subjects completed three conditions: control (no exercise), ∼200 kcal of MIE (∼50% of V˙O2peak), and ∼200 kcal of HIE (∼80% V˙O2peak). One hour postexercise (or control), subjects underwent a 75-g OGTT; plasma glucose and insulin were measured to determine Si.
Results: Exercise resulted in a significant increase in Si, according to OGTT-based indices ranging from 11% to 51% (MIE, P < 0.04) and from 8% to 85% (HIE, P < 0.05). Fasting indices showed no change in response to MIE (P > 0.29) and a decrease in Si following HIE (P < 0.001). OGTT-based and fasting indices underpredicted ΔSi-OMM by ∼40% and ∼90% following MIE and HIE, respectively. ΔSi-OMM following MIE was moderately correlated with ΔSi estimated by OGTT-based indices, but not fasting indices. In contrast, ΔSi-OMM following HIE was not significantly correlated with any Si index.
Conclusions: Insulin sensitivity increases postexercise, according to most Si models. However, there is high variability between indices under each condition, and these measures only correlate with the OMM following MIE. Caution should be exerted when drawing conclusions about the insulin-sensitizing effects of exercise based on OGTT and fasting indices.