Hydration for High School Athletes
Competing at the high school level? Your hydration strategy can be the difference between winning and losing.
High school athletes face unique hydration challenges: they train intensely, often in extreme heat, while still growing and developing. The National Athletic Trainers' Association reports that dehydration is the number one cause of heat-related illness in young athletes and that most high school athletes begin practice already dehydrated. A 2% loss of body weight through sweat reduces aerobic performance by 10-20% and increases injury risk. Despite this, studies show that fewer than 50% of high school athletes follow any hydration plan. Building a structured hydration strategy is essential for performance, safety, and long-term athletic development.
Why Hydration Matters for High School Athletes
Maximizes Performance
Dehydration reduces strength, speed, and endurance. Athletes who maintain proper hydration perform 10-20% better than dehydrated competitors in the same training conditions.
Prevents Heat Illness
Heat-related illness is the third leading cause of death in high school athletes. Proper hydration is the most effective prevention strategy.
Reduces Injury Risk
Dehydrated muscles and tendons are stiffer and more prone to strains, sprains, and tears. Hydration maintains tissue elasticity and reaction time.
Supports Recovery and Growth
Teenage athletes are still growing while training hard. Water supports muscle repair, bone development, and the growth hormone production that occurs during recovery.
Hydration Guidelines
Daily base: 2.5-3.5 liters plus exercise losses
This is your minimum daily intake before accounting for exercise. Active teen athletes need significantly more on training days.
Source: National Athletic Trainers' Association
Pre-exercise: 400-600 ml, 2-3 hours before
Pre-hydrate well before practice or games. Follow with another 200-300 ml 15-20 minutes before warm-up. This ensures you start activity fully hydrated.
During exercise: 200-300 ml every 15-20 minutes
Do not wait until thirsty. By the time you feel thirst, you are already 1-2% dehydrated. Set a timer or use water breaks at natural stopping points.
Post-exercise: 1.5 liters per kg of body weight lost
Weigh yourself before and after practice. For every kilogram lost, drink 1.5 liters over the next 2-4 hours. Include electrolytes for sessions over 60 minutes.
Source: American College of Sports Medicine
Warning Signs of Dehydration
Signs of Dehydration
- Decreased performance despite similar effort levels
- Heart rate that stays elevated longer than normal after stopping exercise
- Muscle cramps during or after practice
- Dark yellow urine before, during, or after practice
- Dizziness, nausea, or feeling faint during activity
- Excessive fatigue that does not improve with rest
Hydration Tips for High School Athletes
- Weigh yourself before and after practice to learn your personal sweat rate
- Start hydrating the night before game days and morning-of with 500 ml upon waking
- Keep a water bottle at your bench, sideline, or training station at all times
- Add electrolyte packets or tablets for sessions lasting over 60 minutes
- Avoid energy drinks before or during exercise; they can cause dangerous heart rate spikes
- Eat fruit at halftime or during breaks for hydration plus quick energy
- Track your hydration and performance correlation using Vari to find your optimal intake
Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice. Consult your athletic trainer or sports medicine doctor for personalized hydration plans.
Frequently Asked Questions
How much water should I drink before a game?
Drink 400-600 ml of water 2-3 hours before game time, then another 200-300 ml about 15-20 minutes before kickoff. Also ensure you have been well-hydrated in the 24 hours leading up to the game. Dark urine on game day means you are starting dehydrated.
Should I use sports drinks or water during practice?
For practices under 60 minutes, water is sufficient. For longer or more intense practices, sports drinks provide electrolytes and carbohydrates that help maintain performance. Avoid sports drinks as casual beverages; save them for when you actually need the electrolytes and energy.
Can dehydration affect my athletic performance?
Dramatically. A 2% loss in body weight through sweat (just 1.5 kg for a 75 kg athlete) reduces endurance by 10-20%, decreases strength, slows reaction time, and impairs decision-making. At 4%, performance can drop by 40-50%. Hydration is one of the most controllable performance variables.
How do I calculate my sweat rate?
Weigh yourself without clothes before and after 1 hour of practice. The difference in kilograms, plus any fluid you drank during practice, equals your hourly sweat rate in liters. Do this in different conditions (hot vs. cool) to understand your range.
Are energy drinks safe for high school athletes?
No. The American Academy of Pediatrics and NATA both advise against energy drinks for adolescent athletes. The high caffeine content can cause dangerous heart rate increases during exercise, dehydration, and impaired heat regulation. Stick to water and sports drinks when needed.
Track Your Athletic Hydration
Get personalized sport-specific hydration plans with Vari.