I'll check Dylan's video, but will offer a few thoughts ahead of time (hopefully not contradictory).
Cramps are not well understood and the etiology (origin) is wide ranging.
In general if cramping is in specific muscles, especially working muscles, then it is likely a fatigue response. It's hard to know why this is, and the specifics of this aren't overly important but if you want to sound smart just mumble something about "Calcium uptake in the sarcoplasmic reticulum". That's also good for when you're running out of social energy at a party and want people to leave you alone.
To help this situation, you can either increase fitness prior to an event, decrease fatigue immediately for the event, or follow a more conservative pacing strategy.
If cramping is more generalized; e.g. multiple muscles at once or muscle not associated work, then they're likely due to electrolyte imbalance. In my opinion this is less common than people think, but some are more susceptible than others. Ask 10 people what is the best electrolyte to take and you'll get 10 answers shouted at you, which is funny because it's basically only Sodium, Calcium, Potassium, Chloride, and Magnesium that have major functions.
Which of these is your panacea is hard to say, but the longer you ride the more important they become.
If you do not drink, you have no reason to replace electrolytes. Your electrolyte concentration will increase because the concentrate in your sweat is less than your blood. Therefore, you sweat more water than electrolytes which increases the concentration in your blood.
We run into issues when we start drinking (in more ways than one...).
- Depending on your sweat rate, drinking 16oz / hour of plain water overly dilutes your electrolyte concentration after somewhere between 2 and 5 hours.
- Drinking 16oz / hour of something middle of the road like Skratch pushes this out a few hours.
- If you need to drink more because you're going very long, or if you tend to cramp due to due to low electrolytes and you either need to drink something very salty like First Endurance EFS Pro or take supplemental capsules.
Regarding "Hot shot" and the like. Because it seems that cramps have something to do with the reflex arc from your muscle to your spinal cord and back to your muscle, then disrupting that reflex arc can potentially help. Hot Short works by stimulating the vagus nerve which runs behind your throat (the spicy drink irritates the throat and in turn the vagus nerve). This can act like a reset to the system to hopefully override the nervous system contribution to the cramp. However, as a word of personal advice, these things can be hard on your stomach and cause you to have to "take out the trash" in the bushes 120 miles into the Belgian Waffle Ride...
This topic is a big one and i'll try to incorporate it into a more formal presentation and include resources up top.
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