Fall Training Season in Suwanee: A Runner’s Guide to Hydration, Electrolytes, and Recovery
If you run in Suwanee, you can feel the season turn. The greenway is busy again. The 6 a.m. group runs have stopped being an act of endurance in their own right. Race calendars fill up steadily from here through November, and a lot of people in Gwinnett are somewhere in the middle of a training block right now.
October is also the month when local runners ask us the most hydration questions, and, honestly, when the internet gives them the worst answers. So here's the plain version: what the evidence supports, what a good electrolyte plan actually looks like, and where a service like ours fits for the runners who use it.
The fall trap: cooler air doesn't mean less fluid loss
The most common mistake we hear about is assuming hydration stops mattering once the weather turns.
It doesn't work that way. Cool, dry fall air changes how sweating feels, not how much fluid leaves the body. Sweat evaporates faster instead of pooling on your skin, so you finish a 50 degree tempo run feeling barely damp and conclude you didn't lose much. Thirst is also a lagging indicator in cool weather, which means the usual internal cue to drink shows up later than it should.
The American College of Sports Medicine's position stand on exercise and fluid replacement makes the core point clearly. Sweat rates and sweat electrolyte content vary enormously between individuals, so there is no universal number. Fluid replacement has to be customized to the person. Their practical method for estimating your own sweat rate is refreshingly low tech: weigh yourself before and after a run, and the difference is roughly what you lost.
One pound of body weight lost is about 16 ounces of fluid.
Electrolytes, minus the marketing
Every electrolyte product on the shelf lists the same handful of minerals, usually without explaining why any of them are there. Here's the short version.
Sodium gets top billing for good reason. It's lost in the largest quantity through sweat, and it's what allows the body to hold onto the fluid you drink rather than simply excreting it. Endurance guidance generally lands in the range of 300 to 600 mg of sodium per hour of sustained effort, scaled up or down by individual sweat rate.
Potassium is not a supporting actor. It is the most abundant cation inside your cells, and the NIH Office of Dietary Supplements describes it as required for normal cell function through its role in maintaining intracellular fluid volume and transmembrane electrochemical gradients. Sodium governs the fluid around your cells. Potassium governs the fluid inside them. They work as a pair, and both are involved in how nerve signals and muscle contractions fire in the first place.
Magnesium does more jobs than almost anything else on the label. The NIH lists it as a cofactor in more than 300 enzyme systems, including ones regulating muscle and nerve function, protein synthesis, blood glucose control, and blood pressure, and it's specifically required for energy production. The same fact sheet notes that many people in the United States consume less than the recommended amount of magnesium, which means plenty of runners start their training block already at the low end of the range.
So sodium is lost in the largest amount, but potassium and magnesium do a disproportionate share of the work per milligram. That's the real reason a well built electrolyte formulation is not just salt water, and it's the same logic behind how our hydration drips are put together. Fluid plus a full electrolyte profile, administered under medical supervision.
A hydration plan you can run this week
Check your urine color. Free, and it works. Pale yellow the day before a long effort means you're in reasonable shape. Dark means you're behind. Completely clear isn't the gold star people think it is, because it can mean drinking too much.
Front load the day before, not the morning of. Drinking normally across the 24 hours before a race does far more than chugging 32 ounces at the start line.
Two hours out, drink about 16 to 20 ounces with something salty. ACSM's guidance is to begin activity euhydrated and with normal plasma electrolyte levels. Sodium alongside the fluid helps you hold onto what you drink.
During, scale to the distance. A 5K in cool Georgia fall weather usually needs nothing. A half marathon calls for roughly 4 to 6 ounces at most aid stations, with an electrolyte source in the back half.
Don't overshoot. Drinking far more than you lose during a long event can dilute blood sodium, a condition called exercise associated hyponatremia. It's uncommon, but it's real, and it's one of the few hydration problems where "more water" is the wrong answer.
Recovery: the first two hours do the heavy lifting
Shirreffs and Sawka, writing in the Journal of Sports Sciences, put it simply. Both water and sodium have to be replaced to re-establish normal total body water. Water alone dilutes blood sodium, which reduces the body's drive to retain fluid, so you drink a liter and a good share of it comes right back out.
In practice, after a hard effort:
• Keep walking for 5 to 15 minutes rather than sitting down at the finish.
• Get carbohydrates and protein in within the first one to two hours.
• Rehydrate steadily over 2 to 4 hours. General post exercise guidance is replacing roughly 150% of the fluid lost, since some of what you drink is excreted before it's absorbed.
• Pair the fluid with sodium. A salty meal alongside your water works better than water on its own.
• Change out of wet clothes, and protect your sleep for the next two to three nights.
Where IV hydration fits
Everything above is the foundation, and it's mostly free. IV hydration is not a replacement for it. But it isn't a gimmick either, and it's worth being specific about what it actually does.
IV fluids deliver fluid and electrolytes directly into the bloodstream, bypassing the gut entirely. That's the whole mechanism, and it's why the approach exists in clinical medicine in the first place. When someone has been unable to drink enough, or drinking enough hasn't been absorbed well, oral rehydration is limited by how fast the gut can move fluid. An IV isn't.
In practice, runners come to Purifi IV in three situations.
Deep in a training block. When weekly mileage is stacking up, some clients add a hydration drip or a B12 shot to their routine. This is a personal choice about a wellness routine, not a prescription.
Ahead of a big event. Some clients like to come in during event week as part of how they prepare. NAD+ is one of the things people ask us about here. We'll tell you the same thing in person that we'll write here. NAD+ is a coenzyme involved in cellular energy metabolism, a number of our clients choose it as part of their routine, and we are not going to tell you it will make you faster. The evidence for athletic performance claims isn't there.
After a long effort where fluids haven't kept up. This is the most common reason runners walk in, particularly after a hot race or a day where drinking simply didn't happen at the rate it needed to.
In every one of those cases, you're getting a conversation with our clinical team first. Purifi IV is led by local ER medical professionals, and part of what that background brings is knowing where the line is. If something feels genuinely wrong after a hard effort, an IV hydration clinic is not the right destination. An emergency department is. We will tell you that, and we'd rather you go.
If you're racing this fall
Pick your hydration plan now, in a training run, rather than improvising on race morning. Test your breakfast, test your sodium source, test the timing. Race day is a bad day to try something new.
And if you're logging long runs up Peachtree Industrial, we're at 1500 Peachtree Industrial Blvd, Ste 125, about ten minutes from Town Center. Come by with questions any time.
This post is for general informational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health. Individual needs vary, and not every service is appropriate for every person. If you experience severe or unusual symptoms during or after exercise, seek emergency medical care.
References
1. Sawka MN, Burke LM, Eichner ER, Maughan RJ, Montain SJ, Stachenfeld NS. "American College of Sports Medicine position stand. Exercise and fluid replacement." Med Sci Sports Exerc. 2007;39(2):377–390. https://pubmed.ncbi.nlm.nih.gov/17277604/
2. Shirreffs SM, Sawka MN. "Fluid and electrolyte needs for training, competition, and recovery." J Sports Sci. 2011;29(Suppl 1):S39–S46. https://pubmed.ncbi.nlm.nih.gov/22150427/
3. NIH Office of Dietary Supplements. "Potassium — Fact Sheet for Health Professionals." https://ods.od.nih.gov/factsheets/Potassium-HealthProfessional/
4. NIH Office of Dietary Supplements. "Magnesium — Fact Sheet for Health Professionals." https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/
5. Mayo Clinic. "Hyponatremia — Symptoms and causes." https://www.mayoclinic.org/diseases-conditions/hyponatremia/symptoms-causes/syc-20373711
Written and reviewed by Johnathon Nolen, PA-C and Dr. Jeremy Nelson, MD.