Our expert says:
Good work on the core work - that really does help. I know coaches in the USA who are prescribing an hour a day of core work with their elite athletes, so it's clearly a recognized effect, which you're now benefiting from.
I've not seen quinine as a "cure" for cramps. So there's no research, I can't think of the theoretical basis for it either. They did prescribe quinine as a treatment for nocturnal leg cramps, but the FDA in America said that this is "dubious", so it's kind of losing popularity now. It was in fact banned for that use in 1994, and that suggests to me that it's probably a bit risky, and without any proven benefit.
All in all, given that there's no evidence of quinine's effectiveness for exercise-associated cramping (which differs from night time cramps, incidentally), and the possible danger, I don't think it's the answer. As I may have said to you previously, the cramp is unlikely caused by a change in pH, or a change in sodium or magnesium or any chemical - it's fatigue related, and neurally caused, so the training you're doing now is a good start. Obviouly work on the specific muscles that cramp - maybe quads, calves, hamstrings.
And stretch before you cramp - by 30km you might want to be stretching at water tables, to help prevent them
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