Although I train using SIS supplement in my drink, I regularly suffer from cramp. I've had negative blood test results for sodium and magnesium levels, do you have any further suggestions to prevent cramp?
Despite being very common among runners, the exact causes of cramps is not certain although there are some additional steps you can take to hopefully help you avoid them. As you have said you do use sport drinks which is a positive step, but you could consider some other factors. For example, ensure you build your training up gradually as fatigue in muscles that are not used to the intensity of exercise you are asking them to do is a major factor. You should also ensure that you stretch and foam roll/massage those muscles used in your training sessions.
On the dietary side, in addition to the carb and electrolyte replacing drinks you are having during and perhaps after exercise, you should aim to ensure that your diet is generally carbohydrate-rich and that you consume plenty of calcium and magnesium-rich foods. You could also consider magnesium supplements if your cramps are persistent.
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