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HYDRATION FOR YOUTH ATHLETES

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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.

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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).

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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.

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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).

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Higher Metabolic Heat Production per kg

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

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Limited Recognition of Thirst

Youth athletes often:

  • do not drink until dehydrated

  • forget to drink during training

  • underestimate fluid needs.

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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

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Higher needs occur with:

  • hot weather

  • high training volume

  • multiple daily sessions

These amounts include all fluids, not just water.

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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.

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During Training

Needed when sessions:

  • last >60 minutes

  • involve repeated high‑intensity bursts

  • occur in heat

  • occur multiple times per day.

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Recommended Intake

  • Every 15–20 minutes: 100–200 mL

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

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When to Use Sports Drinks

Appropriate when:

  • training >60 minutes

  • high‑intensity sessions

  • hot/humid conditions

  • tournaments with repeated efforts.

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Look for:

  • 6–8% carbohydrate

  • sodium 300–500 mg/L

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Post‑Training Hydration

Goal: restore fluid losses and support recovery.

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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.

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Hydration, Growth, and Injury Prevention

 

Adequate hydration supports:

  • bone health

  • connective tissue resilience

  • hormonal balance

  • immune function

  • recovery.

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Dehydration is associated with:

  • increased injury risk

  • impaired bone development

  • reduced recovery capacity

  • cognitive decline

  • energy imbalance

(Alcock, 2025; Everett, 2025).

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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.

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These behaviours increase risk for:

  • dehydration

  • energy deficiency

  • impaired growth

  • elevated injury risk

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

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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.

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Training Day Habits

  • drink before arriving at training

  • sip fluids during breaks

  • use sports drinks for long or intense sessions

  • rehydrate immediately after training.

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For Athletes with High Fluid Needs

Useful options:

  • water + electrolytes

  • diluted sports drinks

  • milk

  • smoothies

  • coconut water (occasional).

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Youth‑Friendly Explanation

 
Why Hydration Matters

Hydration helps you:

  • stay cool

  • think clearly

  • react faster

  • avoid cramps

  • keep energy steady.

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What Works

  • drinking before training

  • sipping during breaks

  • drinking after training

  • using sports drinks for long sessions.

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What Doesn’t Work

  • waiting until you’re thirsty

  • skipping drinks

  • training dehydrated.

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