HYDRATION FOR YOUTH ATHLETES

Why Hydration Matters for Youth Athletes

 

Hydration is a core performance and safety variable for developing athletes. Youth differ from adults in thermoregulation, sweat response, and fluid turnover, making them more vulnerable to:

• overheating

• dehydration

• performance decline

• cognitive impairment

• increased injury risk.

​

Many junior athletes begin training under‑hydrated. Poor hydration affects:

• cardiovascular function

• reaction time

• decision‑making

• endurance

• recovery

• tissue resilience

(Alcock, 2025; Amawi, 2024a; Capra, 2024; Desbrow, 2021; Everett, 2025; Hecht, 2024).

​

​

​

Youth‑Specific Physiology and Hydration Needs

 

Higher Surface‑Area‑to‑Mass Ratio

 

Younger athletes absorb heat more quickly, increasing:

• heat gain

• fluid loss

• thermoregulatory stress.

​​

Lower Sweating Capacity

Children sweat less efficiently and rely more on skin blood flow and radiative cooling. Heat dissipation is reduced during intense or hot‑weather training (Capra, 2024; Desbrow, 2021).

​

Higher Metabolic Heat Production per kg

Youth generate more metabolic heat relative to body mass, increasing hydration demands.

​

Limited Recognition of Thirst

Youth athletes often:

• do not drink until dehydrated

• forget to drink during training

• underestimate fluid needs.

​

​

​

​

Daily Hydration Requirements for Youth Athletes

 

Hydration needs vary with age, body mass, environment, and training load.

 

 

General Daily Fluid Intake

Evidence‑based ranges:

• Children (9–12 years): 1.5–2.0 L/day

• Teens (13–18 years): 2.0–3.0 L/day

​

Higher needs occur with:

• hot weather

• high training volume

• multiple daily sessions

These amounts include all fluids, not just water.

​

​

​

​

Hydration Before, During, and After Training

 

Pre‑Training Hydration

Goal: start training euhydrated.

• 2 hours before: 5–7 mL/kg

• 10–20 minutes before: 100–200 mL if needed

Supports blood volume, thermoregulation, and cognitive readiness.

​

During Training

Needed when sessions:

• last >60 minutes

• involve repeated high‑intensity bursts

• occur in heat

• occur multiple times per day.

​

Recommended Intake

• Every 15–20 minutes: 100–200 mL

• Hourly target: 400–800 mL/hour depending on sweat rate and heat.

​

When to Use Sports Drinks

Appropriate when:

• training >60 minutes

• high‑intensity sessions

• hot/humid conditions

• tournaments with repeated efforts.

​

Look for:

• 6–8% carbohydrate

• sodium 300–500 mg/L

​

Post‑Training Hydration

Goal: restore fluid losses and support recovery.

​

Recommended Intake

• 1.25–1.50 L of fluid per 1 kg of body mass lost

If no body mass measurement is available:

• 400–600 mL immediately after training

• continue drinking regularly over the next 2–4 hours

Electrolytes support fluid retention and recovery.

​

​

​

​

Hydration, Growth, and Injury Prevention

 

Adequate hydration supports:

• bone health

• connective tissue resilience

• hormonal balance

• immune function

• recovery.

​

Dehydration is associated with:

• increased injury risk

• impaired bone development

• reduced recovery capacity

• cognitive decline

• energy imbalance

(Alcock, 2025; Everett, 2025).

​

​

​

​

Hydration and Eating Disorder Risk

 

Restrictive patterns in junior athletes often include:

• avoiding fluids to “feel lighter”

• skipping drinks during training

• relying on low‑calorie beverages.

​

These behaviours increase risk for:

• dehydration

• energy deficiency

• impaired growth

• elevated injury risk

Supporting consistent hydration is protective (Amawi, 2024a).

​

​

​

​

Practical Hydration Strategies 

 

Daily Habits

• drink regularly throughout the day

• include fluids at every meal

• carry a water bottle at school

• increase intake in hot weather

• include electrolytes when needed.

​

Training Day Habits

• drink before arriving at training

• sip fluids during breaks

• use sports drinks for long or intense sessions

• rehydrate immediately after training.

​

For Athletes with High Fluid Needs

Useful options:

• water + electrolytes

• diluted sports drinks

• milk

• smoothies

• coconut water (occasional).

​

​

​

​

Youth‑Friendly Explanation

 

Why Hydration Matters

Hydration helps you:

• stay cool

• think clearly

• react faster

• avoid cramps

• keep energy steady.

​

What Works

• drinking before training

• sipping during breaks

• drinking after training

• using sports drinks for long sessions.

​

What Doesn’t Work

• waiting until you’re thirsty

• skipping drinks

• training dehydrated.