Cost of Walking

Do kids and small adults walk differently from taller people or do they tire faster for some other reason? Peter Weyand from Southern Methodist University, USA, is fascinated by the effect that body size has on physiological function.

"This goes back to Max Kleiber’s work on resting metabolic rates for different sized animals. He found that the bigger you are the slower each gram of tissue uses energy," explains Weyand, who adds, "It’s interesting to know how and why metabolism is regulated that way."

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