Austin's Asphalt: Heat Killing Walk Enzymes?

By Franklin Everett Shaw

January 10, 2026

It’s not just about the heat; it’s about what the heat does. Austin summers are brutal, and while we all know to slather on sunscreen and drink plenty of water, there’s a deeper, cellular level that often gets overlooked: our enzymes. These tiny protein catalysts are essential for everything from digestion to energy production, and they’re surprisingly vulnerable to the scorching Texas sun.

Here’s how to protect them, and yourself, while still enjoying those Zilker Park strolls.

First, let’s understand the enemy: asphalt. On a typical 95°F (35°C) Austin day, asphalt temperatures can easily soar to 140°F (60°C) or higher. This radiant heat isn’t just uncomfortable; it’s a direct assault on your body’s ability to regulate its internal temperature. Enzymes, being proteins, are particularly susceptible to denaturation – essentially, they unravel and lose their function when exposed to excessive heat. This can lead to fatigue, digestive issues, and even more serious health problems.

The most obvious solution is to avoid peak heat hours. Forget that midday walk around Lady Bird Lake. Instead, aim for early morning (before 8 AM) or late evening (after 8 PM) when the sun’s intensity is lower and the asphalt has had a chance to cool down. Check the hourly forecast, paying close attention to the feels like temperature, which accounts for humidity. In Austin, humidity can significantly amplify the effects of heat.

But timing isn’t everything. Route selection is crucial. Ditch the asphalt jungle for shaded trails. Austin boasts a fantastic network of greenbelts and parks.

Consider these options:

• The Barton Creek Greenbelt: Offers miles of shaded trails along the creek. The water provides a natural cooling effect. However, be mindful of flash flood warnings after heavy rain.
• The Shoal Creek Greenbelt: Another excellent option with plenty of tree cover. It’s generally flatter than Barton Creek, making it ideal for less strenuous walks.
• The Ann and Roy Butler Hike-and-Bike Trail (Lady Bird Lake): While parts of this trail are exposed, other sections offer shade, especially on the south side. Opt for the boardwalk sections that are closer to the water.

Beyond timing and location, strategic cooling is essential. Don’t just rely on sweating.

Here’s a tactical approach:

• Pre-Cooling: Before heading out, take a cool shower or bath. This lowers your core body temperature, giving you a head start against the heat.
• Hydration, Hydration, Hydration: Water is your best friend. But don’t just chug it down when you’re thirsty. Sip water consistently throughout the day, especially before, during, and after your walk. Consider adding electrolytes to your water, especially if you’re sweating heavily. Nuun tablets or LMNT packets are good options. Avoid sugary drinks, as they can actually dehydrate you.
• Wear Light-Colored, Loose-Fitting Clothing: Dark colors absorb heat, while light colors reflect it. Loose-fitting clothing allows for better airflow, helping your body cool down. Opt for moisture-wicking fabrics like polyester or nylon.
• Wear a Hat: A wide-brimmed hat provides shade for your face and neck, reducing direct sun exposure.
• Use a Cooling Towel: These towels are designed to absorb water and stay cool for extended periods. Wet it, wring it out, and drape it around your neck or head.
• Plan for Breaks: Don’t push yourself too hard. Take frequent breaks in the shade to allow your body to recover. Look for benches or picnic tables in shaded areas.
• Consider a Portable Fan: A small, battery-operated fan can provide a welcome breeze on those still, humid days.

A common mistake is underestimating the cumulative effect of heat exposure. Even if you’re only walking for 30 minutes, the heat can still take a toll. Pay attention to your body’s signals. If you start to feel dizzy, nauseous, or weak, stop immediately and find a cool place to rest.

Another pitfall is relying solely on thirst as an indicator of dehydration. By the time you feel thirsty, you’re already dehydrated. Proactive hydration is key. Carry a water bottle with you at all times and sip from it regularly.

Let’s talk about specific scenarios. Imagine you’re a dog walker in the Bouldin Creek neighborhood. You’re out and about all day, regardless of the temperature. How do you protect yourself and your furry clients?

• Invest in dog booties: Protect your dog’s paws from the scorching asphalt.
• Carry a portable water bowl: Ensure your canine companions stay hydrated.
• Adjust your schedule: Walk dogs during the coolest parts of the day.
• Shorten walks: Reduce the duration of walks during peak heat hours.
• Know the signs of heatstroke in dogs: Excessive panting, drooling, and weakness are all red flags.

Or consider a construction worker in Pflugerville. You’re exposed to the sun and heat for hours on end.

• Wear a hard hat with a neck shade: Protect your head and neck from direct sunlight.
• Take frequent breaks in the shade: Your employer is legally obligated to provide these.
• Drink plenty of water and electrolytes: Replenish fluids lost through sweat.
• Buddy up: Watch out for your coworkers and be aware of the signs of heatstroke.

Enzyme function is critical for overall health, and protecting them from heat stress is essential, especially in a climate like Austin’s. By understanding the risks, planning your walks strategically, and implementing effective cooling strategies, you can stay active and healthy all summer long. Don’t let the heat win. Take control and protect your enzymes, one shaded step at a time. Remember, a little planning goes a long way in preserving your health and enjoying the beautiful Austin outdoors.