Surfing with diabetes: waterproof CGM and insulin tips

Surfing with Diabetes: Waterproof CGM and Insulin Tips

Surfing is one of the most physically demanding and exhilarating water sports on the planet — and having diabetes doesn't mean you have to sit on the beach. With advances in waterproof continuous glucose monitors (CGMs), smart insulin management, and ocean-specific preparation, people with Type 1 and Type 2 diabetes are paddling out every day around the world. This guide covers everything you need to know to surf safely and confidently.

Can People with Diabetes Surf?

Absolutely. Surfing is a full-body aerobic and anaerobic workout that engages your core, shoulders, and legs simultaneously. The physical demands mean your blood glucose can shift rapidly — rising from adrenaline or dropping from sustained paddling. Understanding these dynamics is the first step to safe surfing.

Waterproof CGM: What You Need to Know

A continuous glucose monitor is arguably the most important piece of technology for a diabetic surfer. Most modern CGMs are rated water-resistant, but water resistance and waterproof are not the same thing. Here's what to look for:

• IP68 rating: The highest standard for water and dust resistance — look for CGMs and patches rated IP68 for sustained submersion.
• Depth and duration: Most CGMs are rated to 8 feet (2.4 m) for 30 minutes. Wipeouts can briefly exceed this, so overpatch adhesive is essential.
• Saltwater tolerance: Saltwater is more corrosive than fresh water. Rinse your sensor site and receiver with fresh water after every session.
• Adhesive overlays: Medical-grade waterproof overpatch tape keeps your CGM sealed and secured during tumbles. MDS Diabetes carries a range of CGM overlays and skin-friendly adhesive patches designed specifically for active water sports use.

Best CGM Placement for Surfing

Sensor placement matters more in water sports than almost any other activity. Recommended sites for surfers include:

• Upper arm (tricep area): Less likely to hit the board during pop-ups, but can be compressed in a wetsuit.
• Abdomen: Well-protected under a wetsuit; avoid areas where the board leash or wax contacts skin.
• Lower back: An emerging preferred site for surfers — minimal board contact and wetsuit coverage provides protection.

Wetsuit Compatibility Tips

A tight wetsuit can compress a sensor and cause inaccurate readings. Choose a wetsuit cut that avoids direct pressure on your CGM site. Neoprene patches or foam donuts placed around the sensor before suiting up can relieve compression. Check your CGM reading before paddling out and again immediately after exiting the water to catch any compression artifacts.

Managing Insulin in a Surf Environment

Insulin and the ocean don't naturally mix well. Heat, saltwater, and physical activity all affect insulin stability and absorption.

• Insulin pumps: Most tubeless pumps (like the Omnipod) are waterproof to a degree, but check your specific model's rating. Consider suspending your basal rate 60–90 minutes before a long session to reduce hypoglycemia risk.
• Injections before surfing: If you use MDI (multiple daily injections), time your rapid-acting insulin carefully. Surfing dramatically increases insulin sensitivity — many surfers reduce their pre-surf bolus by 20–50%.
• Insulin storage on the beach: Never leave insulin in direct sunlight or a hot car. Use an insulated insulin travel wallet or cooling case. MDS Diabetes offers compact, water-resistant insulin cooling pouches ideal for beach bags.

Hypoglycemia Safety Plan for Surfers

Hypos in the ocean are a genuine emergency. Build a safety plan before you ever paddle out:

• Always surf with a buddy who knows you have diabetes and recognizes hypoglycemia symptoms.
• Attach a small, waterproof glucose gel pouch to your leash or board in a waterproof case — a 15g fast-acting carb is your first line of defense.
• Set CGM low alerts at 90 mg/dL (5.0 mmol/L) when surfing — earlier than your usual threshold.
• Exit the water immediately if you feel dizzy, confused, or unusually fatigued.
• Check glucose before paddling out; aim for 140–180 mg/dL (7.8–10 mmol/L) as a starting point.

Blood Glucose Targets for Surfing

Key Takeaways

• Use a waterproof CGM with an adhesive overpatach and check its IP rating before every surf session.
• Place sensors away from board contact zones and wetsuit compression points.
• Reduce insulin doses before prolonged surf — physical activity significantly increases insulin sensitivity.
• Always surf with a buddy and keep fast-acting glucose accessible on your board or leash.
• Rinse CGM sensors and pump ports with fresh water after ocean exposure to prevent saltwater corrosion.
• MDS Diabetes waterproof patches, cooling pouches, and CGM overlays are purpose-built for active diabetics who refuse to sit on the sidelines.

Frequently Asked Questions