Our expert says:
If you do 90 min of exercise it is normal to feel shaky if you don't use a source of readily available carbohydrate to fuel your activity. All athletes who exercise for long periods use energy drinks or energy bars to maintain their energy levels. The fact that you get shaky and feel that you are going to collapse is due to a drop in your blood sugar levels. If the blood test you had was just a single determination then this would not have pinpointed if you suffer from hypoglycaemia (low blood sugar). To find out if you do suffer from hypoglycaemia you would need to have a glucose tolerance test done. This may be a good idea - discuss this option with your dr. If you should have hypoclyaemia then I would urge you to consult a clinical dietitian (visit the Association for Dietetics in SA Website at: www.adsa.org.za and click on "Find a Dietitian" to find a dietitian in your area). The dietitian will work out a diet for you that maintains your blood sugar and insulin at more constant levels, thus preventing these dips that cause the shaky feeling and the fainting. The diet for hypoglycaemia is based on foods with a low glycaemic index (GI). To read more about the GI, click on 'Diet' at the top of this page and then on Weight loss' and 'The right approach' and read the articles on the GI. The dietitian will also have to make provision for your medications, some of which may make the low blood sugar worse.
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