The Importance of Hydration for Rugby League Performance

Why Hydration Could Be the Difference Between Winning and Losing

Whether you're an NRL player, junior representative athlete or local club footballer, hydration is one of the most overlooked aspects of rugby league performance.

Many players spend hours in the gym improving strength and power, yet arrive at training or game day already dehydrated. Even mild dehydration can reduce running performance, decision making, recovery and repeated sprint ability—all critical qualities in rugby league.

At EMP Performance, we educate our athletes that hydration isn't simply about drinking water during a game. It's about having a structured hydration strategy before, during and after every training session and match.

Why Hydration Matters in Rugby League

Rugby league is one of the most physically demanding team sports in the world.

Players perform repeated accelerations, collisions, tackles, carries and high-speed running while wearing heavy playing equipment, often in hot and humid conditions.

During a game, athletes lose fluid primarily through sweat. Along with water, sweat also contains important electrolytes—particularly sodium—which are essential for muscle contraction, nerve function and maintaining fluid balance.

Research has consistently shown that dehydration can negatively affect:

• Repeated sprint performance

• High-intensity running

• Decision making

• Skill execution

• Strength and power output

• Recovery following competition

Even losing as little as 2% of body weight through dehydration has been shown to impair physical and cognitive performance.

For an 85 kg rugby league player, that's only 1.7 kg of sweat loss.

How Much Fluid Do Rugby League Players Lose?

Every athlete is different.

Sweat rates can vary dramatically depending on:

• Environmental temperature

• Humidity

• Playing position

• Exercise intensity

• Individual genetics

• Clothing and equipment

It's not uncommon for rugby league players to lose between 1–3 litres of sweat per hour, with significantly higher losses during summer training or tournaments.

This is why personalised hydration strategies are so important.

How to Measure Your Sweat Rate

One of the easiest ways to determine your hydration needs is by calculating your sweat loss.

Simply:

1. Weigh yourself before training.

2. Complete your session.

3. Weigh yourself again wearing similar clothing.

4. Account for any fluid consumed during the session.

As a general guide:

Every 1 kg of body weight lost equals approximately 1 litre of sweat lost.

To fully rehydrate after training or competition, sports nutrition guidelines recommend replacing approximately 150% of the fluid lost over the following few hours.

For example:

• 1 kg lost = drink approximately 1.5 litres

• 2 kg lost = drink approximately 3 litres

This allows for ongoing urine losses while restoring normal hydration levels.

Water Isn't Always Enough

Many players assume simply drinking water is sufficient.

Unfortunately, that's not always the case.

Sweat contains large amounts of sodium, one of the body's most important electrolytes.

Replacing fluid without replacing sodium may slow rehydration and increase the likelihood of muscle cramps or continued dehydration.

Following longer or more intense sessions, consider including:

• Electrolyte tablets

• Sports drinks

• Sodium-rich recovery meals

• Salt added to meals

• Coconut water combined with additional electrolytes

While coconut water provides potassium and some carbohydrate, it contains significantly less sodium than athletes typically lose in sweat.

Hydration Before a Rugby League Game

Hydration begins well before kick-off.

The Australian Institute of Sport recommends consuming approximately:

5–7 mL of fluid per kilogram of body weight around four hours before exercise.

If urine remains dark or concentrated, consume another:

3–5 mL per kilogram approximately two hours before competition.

Your goal is to arrive at the ground fully hydrated—not trying to catch up minutes before kick-off.

Hydration During the Match

Opportunities to drink during rugby league can be limited.

Use every available break to consume small amounts of fluid.

Halftime provides an excellent opportunity to replace some fluid losses through:

• Water

• Electrolyte drinks

• Sports drinks (particularly during longer matches or tournaments)

Taking frequent small sips is generally more comfortable than consuming large amounts all at once.

Hydration After the Game

Recovery starts at the final whistle.

Alongside carbohydrate and protein, fluid replacement should become your immediate priority.

Aim to:

• Replace approximately 150% of fluid lost

• Include sodium in your recovery meal or drink

• Continue drinking gradually over the next 2–6 hours

• Monitor urine colour until it returns to a pale straw colour

Combining adequate hydration with carbohydrate and protein significantly improves recovery and prepares your body for the next training session.

Practical Hydration Tips for Rugby League Players

At EMP Performance, we encourage our athletes to follow these habits:

• Carry a water bottle throughout the day.

• Don't rely on thirst alone.

• Monitor urine colour regularly.

• Weigh yourself before and after key sessions.

• Replace every kilogram lost with approximately 1.5 litres of fluid.

• Include electrolytes after heavy sweat losses.

• Practice your hydration strategy during training—not for the first time on game day.

Final Thoughts

Hydration is one of the simplest ways to improve rugby league performance.

You can spend hours developing strength, speed and conditioning, but if you consistently begin training or competition dehydrated, you're limiting your ability to perform at your highest level.

The best rugby league athletes don't leave hydration to chance—they plan it.

Small improvements in hydration can lead to better training quality, improved recovery, greater repeat sprint ability and more consistent performances throughout the season.

At EMP Performance, we help junior and senior rugby league players build complete athletes through evidence-based strength and conditioning, nutrition education and performance coaching.

Ready to Improve Your Rugby League Performance?

Whether you're preparing for representative football, preseason, or simply want to become a stronger, fitter and more resilient player, EMP Performance can help.

Our Rugby League Performance Program includes:

• Strength & conditioning

• Speed development

• Power training

• Injury prevention

• Performance testing

• Nutrition guidance

• Recovery strategies

• Individual programming

Book your free consultation today and take the next step in your rugby league performance.