In movies like Call of the Wild, huskies pull sleds for hundreds of miles over the Alaskan tundra. A Moment of Science wonders, what kind of dogs are sled dogs?
Olympic trainers take these systems into account. A long-distance runner should use aerobic metabolism for as much of her ATP as possible. To ensure this, she’ll be tested on a treadmill to measure her threshold of aerobic metabolism.
What’s particularly striking is the fact that birds and alligators, unlike humans and other mammals, have a hinge-like joint in their pelvis that allows the pubic bone to move. When an alligator or bird inhales the pubic bone rocks downward, expanding the abdominal cavity.
Recent research has shown that caffeine can actually boost a runner’s endurance and thereby improve his time by 10 to 15%. These days research is showing that in moderation caffeine really isn’t so bad for the body.