Sled Dogs and Energy Management

Kate from MinuteEarth explains that while humans aren't the fastest mammals, they can outrun most species over long distances, except for certain sled dogs. These dogs, bred for ultramarathons, have a unique metabolism that allows them to convert fat and protein into energy without relying on glycogen, unlike humans. This enables them to run long distances without 'bonking' and recover quickly, unlike human ultra-athletes.

Which species can outrun humans over long distances?

• Certain dogs

• Cheetahs

• Kangaroos

• Elephants

What are the two types of fuel that mammals rely on for energy?

• Sugars and carbohydrates

• Fats and proteins

• Glycogen and fats/proteins

• Glycogen and carbohydrates

Why do long-distance runners face challenges with glycogen?

• Glycogen is too slow to burn

• Glycogen storage is limited

• Glycogen is not needed for energy

• Glycogen is too expensive

How do sled dogs maintain their energy levels during races?

• By eating high-carb foods

• By burning fat and protein without glycogen

• By burning glycogen only

• By resting frequently

What is unique about sled dogs' recovery after ultramarathons?

• They finish with depleted energy

• They need months to recover

• They recover quickly and can race again soon

• They require special diets to recover