How to Prevent Heatstroke During Marine Sports | A Complete Guide to Safely Enjoying Summer Water Sports

Summer marine sports are the best season to enjoy various activities such as jet skiing, wakeboarding, and kayaking on the open sea or lakes. However, the risk of heatstroke due to intense UV rays, high temperatures, and reflected glare can be higher than on land. The feeling of "coolness" on the water can make it difficult to notice dehydration or rising body temperature, which is a major pitfall. This article summarizes specific measures to prevent heatstroke during marine sports, with content useful for both beginners and experienced participants.

Why are you prone to heatstroke during marine sports?

On the sea or lake, there is wind, and splashing water lowers the perceived temperature. This makes it difficult to feel "hot," and body temperature can rise without you noticing. Furthermore, the following factors can increase the risk of heatstroke:

• Reflection from the water surface (reflected light): Increases UV radiation compared to normal ground, accelerating body temperature rise.
• Difficulty noticing perspiration: Being wet makes it harder to realize you are sweating, leading to faster dehydration.
• Wearing wetsuits or life jackets: Essential safety gear can trap body heat.
• Long periods of activity: Jet skiing, fishing, and marine leisure often last for several hours.
• Lack of resting places: Unlike on land, it is difficult to secure shade or cool places.

Don't miss the symptoms and early signs of heatstroke

The response to heatstroke varies depending on its progression. Early detection is crucial.

Mild symptoms (early signs of heatstroke)

• Dizziness, lightheadedness
• Muscle cramps (heat cramps)
• Heavy sweating, hot skin
• Mild headache or fatigue

Moderate to severe symptoms (stop activity immediately)

• Nausea, vomiting
• Confusion, feeling dazed
• Body temperature 40°C or higher, dry and hot skin
• Unresponsive to calls, loss of consciousness

If you notice moderate or severe symptoms, immediately stop the activity, move to a cool place, rehydrate, and call for help. Especially at sea, prompt action can be life-saving.

7 Heatstroke Prevention Measures to Take During Marine Sports

1. Make regular hydration a habit

By the time you feel "thirsty," you are already mildly dehydrated. During marine sports, aim to drink water every 30 minutes. In addition to water, using sports drinks or oral rehydration solutions can help replenish lost electrolytes simultaneously. Carbonated drinks and alcohol have a diuretic effect, so it's wise to avoid them during activity.

2. Take appropriate breaks

Continuous activity under the scorching sun is a major cause of heatstroke. Take a break in the shade every 1 to 2 hours. Utilizing covered areas at marinas, boat cabins, or tent-style sunshades can be effective.

3. Choose UV-cut and quick-drying apparel

Exposing bare skin causes body temperature to rise due to UV rays and leads to sunburn. Rash guards with high UPF (Ultraviolet Protection Factor) and quick-drying T-shirts are excellent items that keep you cool while preventing sunburn. White or light-colored clothing absorbs less heat, making it suitable for summer marine sports.

4. Protect your head and eyes with a hat and sunglasses

The head is the most susceptible part to direct sunlight. Wide-brimmed marine caps or surf hats suitable for use on the water prevent overheating of the head. UV-cut sunglasses are also essential to protect your eyes from glare reflected off the water surface.

5. Choose early morning or evening hours for activities

Try to avoid or limit activities during the hours of 10 AM to 3 PM when UV radiation and temperature are at their highest. Early mornings and evenings have lower temperatures and milder sunlight, significantly reducing the risk of heatstroke.

6. Bring heatstroke prevention items

Utilizing portable cooling items can effectively lower your perceived temperature.

• Cooling towels: Quickly lower body temperature when applied to the neck or forehead.
• Insulated bottles/coolers: Keep cold drinks cool for extended periods.
• Sunscreen cream: Choose SPF50+ and water-resistant types, and reapply frequently.
• Salt tablets/supplementary jellies: Can quickly replenish electrolytes.

7. Check your physical condition beforehand and don't push yourself

Engaging in marine sports when sleep-deprived, the day after drinking, or in poor physical condition significantly increases the risk of heatstroke. Before heading out, check your body temperature, physical condition, and fluid intake, and have the courage to stop activity if you feel any abnormality. This is the best preventive measure.

How to Balance Life Jacket and Marine Equipment with Heatstroke Prevention

Wearing life jackets and wetsuits is essential for safety, but they can also trap body heat. By keeping the following points in mind, you can achieve both safety and comfort:

• Choose a thin, breathable life jacket: Lightweight summer models offer excellent ventilation and help suppress body temperature rise.
• Utilize short wetsuits or swimwear-compatible gear: Less heat build-up compared to full-body types.
• Temporarily remove your life jacket to cool down during breaks (always re-don it when active on the water).
• Wearing UV-cut, quick-drying apparel under your gear can reduce stuffiness inside the equipment.

JSP TOKAI offers a wide range of life jackets and marine wear suitable for summer marine sports. For advice on selecting items that balance safety and comfort, please contact us through the JSP TOKAI official website.

Frequently Asked Questions (FAQ)

Q1. Can I get heatstroke even when I'm in the water?

Yes, you can. Even though your body feels cool in the water, your head and face are continuously exposed to intense sunlight and UV rays on the surface. Breaks and hydration are necessary even during prolonged activities in the water.

Q2. Which is more effective, sports drinks or water?

Sports drinks or oral rehydration solutions are effective when you are sweating a lot. However, excessive consumption of high-sugar drinks can burden your stomach, so it's ideal to alternate between water and sports drinks.

Q3. What special precautions should be taken when children or elderly people are present?

Children have underdeveloped thermoregulatory functions, and the elderly tend to be less aware of heat or thirst. In both cases, it is necessary for adults to actively encourage hydration and provide more frequent breaks. Especially avoid prolonged activity in the scorching sun.

Q4. What should I do if I experience symptoms of heatstroke while riding a jet ski?

Immediately head to the nearest marina or beach at a safe speed, stop the engine, and move to a cool place. If you are disoriented, stop operating the vessel yourself and contact a fellow passenger or emergency services (Japan Coast Guard: 118).

Q5. Does sunscreen help prevent heatstroke?

While not a direct heatstroke prevention measure, skin damage from sunburn can impair thermoregulatory functions. Using water-resistant, high-SPF sunscreen is an important measure that complements heatstroke prevention.

Summary | Enjoy Summer Marine Sports with Thorough Safety Measures

The key points for preventing heatstroke during marine sports can be summarized into four: "frequent hydration," "regular breaks," "appropriate gear selection," and "strategic activity timing." Because of the unique environment on the water, even more conscious heatstroke prevention measures are necessary than on land.

By balancing safety equipment and heatstroke prevention, you can enjoy summer jet skiing, wakeboarding, kayaking, and other water sports for longer and more comfortably.

JSP TOKAI offers a wide range of items to support a safe and comfortable summer marine life, including life jackets, marine wear, and water sports equipment. Be sure to check out our latest lineup and prepare thoroughly to enjoy this season's marine sports to the fullest.

→ Check out marine products on the JSP TOKAI official website