Electrolytes for Training, Do You Actually Need Them? (AU 2026)

What Electrolytes Do During Exercise

Electrolytes are minerals that carry an electric charge in solution. Five matter for exercise: sodium, potassium, chloride, magnesium, and calcium. They sit in different fluid compartments of the body and drive a few things you cannot train without, nerve impulse transmission, muscle contraction, and the osmotic gradient that decides how much water sits inside versus outside your cells.

Sodium is the headline act. It is the dominant electrolyte in extracellular fluid and in sweat, and it does two important jobs during exercise: it helps the small intestine absorb water (the sodium-glucose cotransport mechanism behind every sports drink formula), and it helps the body retain the fluid you drink rather than urinating it out.

Potassium is the dominant intracellular electrolyte. You lose far less of it in sweat than sodium, typically only 100–250 mg per litre versus sodium's much wider range, and a normal diet replaces it easily.

Chloride tags along with sodium (table salt is sodium chloride) and rarely needs separate attention.

Magnesium and calcium are present in sweat in very small amounts. Magnesium loss through sweat is usually a few mg per hour, not the hundreds of mg some products imply. They get included in electrolyte powders because they sound impressive on the label, not because exercise depletes them at meaningful rates.

How Much You Lose in Sweat

Two numbers decide your electrolyte needs: sweat rate (how much fluid you lose per hour) and sweat sodium concentration (how salty that fluid is). Both vary enormously between people.

Sweat rate typically ranges from 0.5 L/hr for a light recreational session in mild weather, up to 2 L/hr or more for elite athletes in the heat. Most adults doing a 60–90 minute gym session in air conditioning sit around 0.5–1 L/hr.

Sweat sodium concentration is the one that catches people out. Published reviews of athlete sweat testing (Baker, 2017)^[3] put the range at roughly 230–1700 mg of sodium per litre of sweat, with some "salty sweaters" measuring even higher. Inter-individual variability in average sweat sodium has been reported at 37–47%, meaning two people doing the same workout in the same room can lose dramatically different amounts of sodium per hour.

Practically, that means generic dose recommendations are rough at best. If you finish workouts with visible salt crusts on your skin or clothing, you are at the high end of the range. If you do not, you are probably nearer the middle.

When You Genuinely Need Them

The evidence points to a small set of situations where electrolyte supplementation moves the needle. Outside those, water is fine.

You probably need electrolytes when:

• The session lasts longer than 60–90 minutes of continuous moderate-to-hard effort.
• You are training in hot or humid conditions where sweat rate climbs above ~1 L/hr.
• You are a confirmed salty sweater (visible salt residue on skin or clothes after sessions).
• You are doing back-to-back sessions in a single day, such as a tournament or a training camp.
• You are competing in an endurance event over 90 minutes.

You probably do not need them when:

• A 45–60 minute gym session in air conditioning, even if you sweat heavily.
• An easy run or ride under an hour in cool conditions.
• Most cardio classes, lifting sessions, and recreational sport played in mild weather.

The ACSM's position stand on exercise and fluid replacement (Sawka et al., 2007)^[1] is explicit about this: for activity lasting more than an hour, a drink containing roughly 0.5–0.7 g of sodium per litre of water can improve palatability, help fluid retention, and reduce hyponatremia risk in people drinking large volumes. For shorter sessions, the evidence is much thinner.

The High-Sodium Trend (LMNT and Friends)

LMNT is the flag-bearer of the high-sodium category, 1000 mg sodium, 200 mg potassium, 60 mg magnesium per stick pack, with zero sugar. Several Australian brands now offer near-identical formulas. The argument runs that mainstream dietary guidelines under-shoot sodium for active people, particularly those on low-carb or keto diets who excrete more sodium, and that 4–6 grams of sodium per day from all sources is closer to optimal than the 2 g cap most health agencies set.

The evidence here is contested. There is one observational study (published 2024) that has been used to support the 3000+ mg/day argument, but it has well-documented limitations and is not the kind of randomised trial that would settle the question. Mainstream cardiology bodies, including the WHO and the National Heart Foundation of Australia, still recommend keeping sodium under ~2000 mg/day for the general population on cardiovascular grounds.

Who 1000 mg per serve actually makes sense for: Athletes losing more than 1 L of sweat per hour for over an hour, salty sweaters, people on strict low-carb or ketogenic diets that genuinely deplete sodium, and athletes pre-loading sodium before an endurance event in heat (a strategy with reasonable evidence for fluid retention and time-to-exhaustion improvements).

Who it does not: Someone doing a 45-minute lifting session and downing a 1000 mg sachet because the marketing says it is "optimal." That is, on most days, just adding salt to your daily intake, fine for many people, but not a performance intervention.

The Australian Summer Angle

If you train outdoors in Brisbane, Darwin, Townsville, or anywhere north of about Coffs Harbour in January and February, the calculation changes. Queensland summer humidity routinely sits at 65–70%, and when the dew point pushes past 20°C, evaporative cooling becomes inefficient, sweat drips off rather than evaporates, so you lose fluid without getting the cooling benefit. Sweat rates of 1.5–2 L/hr are normal in that environment. In short, hot-climate training tilts the math toward supplementation.

Sports Dietitians Australia's position statement on nutrition for exercise in hot environments (Racinais et al., 2020)^[2] is straightforward: athletes should begin hot sessions euhydrated, customise fluid intake to individual sweat rates, and consider sodium-containing fluids during prolonged work. Pre-exercise hyperhydration with a sodium-loaded drink (around 7.5 g of sodium chloride per litre, taken 2 hours before) has reasonable evidence (Sims et al., 2007^[5]; Berry et al., 2023^[6]) for improving fluid retention and reducing thermoregulatory strain in the heat.

Practical implication: if you are a recreational runner heading out for 90+ minutes on a 35°C Brisbane morning, an electrolyte drink during the run is sensible. If you are doing a 5km run before work in the same conditions, water is fine and you will replace anything you lost with breakfast.

Hyponatremia, The Reverse Problem

The risk most people underestimate is not dehydration, it is exercise-associated hyponatremia (EAH)^[4], where blood sodium drops dangerously low because the athlete drank too much plain water during a long event. Symptoms range from headache, nausea, and bloating in mild cases to confusion, seizures, and cerebral oedema in severe ones. Symptomatic EAH affects around 1% of endurance athletes, but in some cohorts of marathon and ultra-distance runners, the prevalence of any biochemical hyponatremia has been reported above 30%.

The classic risk profile: a slower-paced marathon or ultra runner, often female, drinking water at every aid station without losing equivalent body weight, in mild or cool conditions where sweat rate is moderate but fluid intake is high. The body cannot excrete water fast enough, blood sodium dilutes, and things get dangerous.

This is the one situation where the 1000mg-sodium products earn their keep, sodium-rich fluids during very long events help defend blood sodium concentration. For a 60-minute gym session, the risk of hyponatremia is effectively zero, and the answer is to drink to thirst.

DIY vs Commercial Products

The active ingredients in a $3–4 stick pack of premium electrolytes cost roughly 5–10 cents at supermarket prices. The packaging, flavouring, and brand are most of the price. If you want the same physiology for less, the DIY math is straightforward.

A rough 1000 mg sodium serve from your pantry:

• ~1/2 teaspoon table salt (sodium chloride) provides roughly 1000 mg sodium.
• ~1/8 teaspoon "lite salt" or "no salt" (potassium chloride, sold in major Australian supermarkets) provides roughly 200 mg potassium.
• Optional: a magnesium glycinate capsule opened into the mix for 60–100 mg magnesium.
• A squeeze of lemon or lime, and a small amount of sugar or carbohydrate if you want sodium-glucose cotransport for faster absorption during exercise.

Mixed into 500–750 mL of water, that is the same physiological dose as a premium sachet for cents rather than dollars. The downsides: it tastes worse than commercial products, takes 30 seconds to mix, and you have to weigh or measure carefully, salt densities vary, and 1/2 teaspoon is an estimate, not a precise dose.

Commercial powders are worth the premium if you value convenience, consistent dosing, and palatability, particularly during exercise, when you are more likely to keep drinking something that tastes good. For at-home or pre-workout use, the DIY route is hard to beat on cost.

How to Buy Smart in Australia

If you are going to buy electrolytes, ignore the front-of-pack branding and read the supplement facts panel. The numbers that matter:

• Sodium per serve. 200–500 mg is appropriate for general training and shorter endurance work. 800–1000+ mg is for long, hot, or high-sweat-rate sessions, and for salty sweaters. Match the dose to the situation.
• Sugar content. Some sports drinks are 6–8% carbohydrate, which is useful during endurance work (the carb itself fuels effort, and glucose accelerates sodium absorption). Others are "zero sugar" with no carbohydrate, fine for short sessions and daily hydration, but slower for fluid uptake during exercise.
• Price per serve. Australian premium electrolytes typically land at $2.50–4.00 per serve. Mid-range tablets and powders sit at $0.80–1.50. Mainstream sports drinks in 600 mL bottles work out to under $1 per serve.
• Artificial sweeteners and flavours. Mostly cosmetic decisions, but if you are sensitive to sucralose or aspartame, check the label.

Compare on cost per gram of sodium delivered, not on retail sticker price. A $40 tub with 30 serves at 1000 mg sodium is cheaper per gram of sodium than a $25 box of tablets at 250 mg per serve.

The Verdict

Short or moderate gym sessions in mild conditions: water, drink to thirst, do not bother with electrolytes.

Sessions over 60–90 minutes, or anything in hot/humid Australian conditions: use a moderate-sodium drink (200–500 mg per serve), or higher if you sweat heavily.

Endurance events of 2+ hours, particularly in heat: sodium pre-loading and during-event electrolytes have real evidence behind them. The 1000mg-sodium products genuinely earn their place here.

For everyday training, premium electrolyte sachets are mostly a convenience and flavour purchase, not a performance one. Spend the money on a session where it actually counts, or mix it yourself from the pantry and put the savings towards better food.

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