Electrolytes Alone Won't Fuel a Long Ride — What the Research Says

You leave the house at 6am with two bottles of electrolyte mix and a banana. The first ninety minutes feel fine. By the third hour the legs go quiet. The pace doesn't change on the computer, but it does in your body, and you start watching the kilometres tick down differently — less smoothly, more deliberately. The electrolytes are doing what they were designed to do. They're just not the thing your body needs most right now.

This is the gap that catches a lot of Canadian cyclists out as the days get longer and rides stretch from 90 minutes to three or four hours. The electrolyte drink that worked fine for shorter sessions stops feeling sufficient, and most riders don't know why. The conversation around hydration has come to imply that electrolytes alone are a complete fuelling strategy for long efforts. They aren't, and they were never designed to be.

What electrolytes actually do — and where the job ends

Electrolytes regulate fluid balance, nerve signalling, and muscle contraction. Sodium is the dominant one lost through sweat, typically around 0.5 to 1.5 grams per litre depending on the athlete and conditions. Maintaining sodium status prevents hyponatremia on very long efforts, supports plasma volume, and helps water move out of the gut and into circulation.

What electrolytes do not provide is energy. They are minerals, not fuel. Energy during endurance exercise comes from two sources — stored glycogen in the muscle and liver, and carbohydrate ingested during the session. Drinking an electrolyte tab does nothing for either. It hydrates and it preserves muscle function, which is useful, but it leaves the energy side of the equation untouched.

The 90-minute mark — when glycogen stops being enough

A trained athlete carries somewhere around 80 to 100 grams of glycogen in the liver and 300 to 500 grams in working muscles, depending on diet and training state. At endurance pace, this glycogen burns through quickly. Coyle and colleagues' classic work showed performance impairment correlated tightly with declining muscle glycogen at roughly the 90-minute mark in moderate-intensity exercise (Coyle et al., 1986). Below that threshold, fuelling is helpful but not decisive. Above it, the absence of ingested carbohydrate becomes the limiting factor.

The standard recommendation for rides longer than 90 minutes is 30 to 60 grams of carbohydrate per hour, scaling toward 60 to 90 grams per hour for longer or harder efforts (Jeukendrup, 2014). At those intensities electrolyte status still matters, but only in the sense that it keeps the system running. The system still needs fuel. Drinking more electrolyte mix doesn't address the gap.

Why combining glucose and fructose changes the math

The body absorbs glucose through the SGLT1 transporter, which has an absorption ceiling of around one gram per minute, or roughly 60 grams per hour. Adding fructose opens a second pathway — the GLUT5 transporter — that can absorb an additional 30 to 60 grams per hour. The two transporters work in parallel, which is why combined-source carbohydrate drinks reach total intake rates that glucose alone cannot.

Currell and Jeukendrup (2008) tested this directly. Cyclists who drank a glucose-fructose blend during a two-hour ride performed roughly 8 percent better in a subsequent one-hour time trial than those drinking glucose alone, at matched total carbohydrate intake. The difference came from how much of the ingested carb was actually being oxidised. This is why Olway®'s Performance Drink Mix is built on a 2:1 maltodextrin-to-fructose ratio. At 60 to 90 grams per hour, the ratio determines whether the carbohydrate reaches the muscle or sits in the gut.

The Canadian context — why this gap shows up here

In Canada, the spring-to-summer transition is steep. Indoor sessions of 60 to 90 minutes give way quickly to outdoor rides of two to four hours, often within a few weeks. The drinks in most shop coolers — Nuun tablets, Skratch Sport Hydration, LMNT, GU Hydration Tabs — are electrolyte-led products. They're good at what they do. They're not designed to fuel a three-hour ride.

The gap in the Canadian retail landscape is between a sweat-replacement product and a true carbohydrate drink at an accessible price. Maurten covers the high end at roughly five dollars per serving. The category between two and three dollars per serving, with genuine 2:1 carbohydrate science, has been thin. Olway®'s Performance Drink Mix lands in that range with 50 grams of carbohydrate per serving and an electrolyte profile sufficient for sweat replacement in most conditions.

What to use, when

Under 60 minutes, water with electrolytes is usually enough, particularly in cooler conditions. From 60 to 90 minutes at moderate intensity, electrolytes plus around 30 grams of carbohydrate per hour starts to matter for finishing strong. Past 90 minutes the conversation shifts: 60 to 80 grams per hour from a 2:1 source is the productive range for most everyday athletes, not the 120-gram figure being pushed by the pro peloton. Beyond three hours, mixing the drink mix with solid food or gels helps manage flavour fatigue, which is its own conversation.

The point is not to drink more. The point is to match what's in the bottle to what the body actually runs on for the duration of the ride.

Closing

The ride that feels good in the final hour is usually the ride where the fuelling was right early on. That doesn't mean carrying more bottles or eating more. It means recognising that electrolytes and carbohydrate solve different problems, and that on rides past 90 minutes, the carbohydrate problem is the one that determines how the back half feels. Electrolytes do their job. Carbohydrate does its job. Treating them as the same thing is what keeps a lot of athletes in the same pattern of finishing tired and wondering why.

More on the science behind the formulas at the Olway® performance science page.