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Chapter 4 -- Part 3
Women in certain areas of East Africa can walk with relative ease carrying large loads balanced on their heads, which has been the focus of recent studies.
Women from the Luo and Kikuyu tribes can carry loads up to 20% of their body weight without using more energy.
The energy consumption increases in proportion to the weight carried.
Carrying 50% of the body weight increases their energy consumption by 30%.
They were the experimenters of Heglund.
The high load-carrying efficiency of these women is due to the fact that the center of mass is moving in a pendulum-like fashion.
Their walking is similar to a swinging pendulum.
It's not known what part of the movement or training that brings about the enhanced load carrying abilities.
Some of the problems in this chapter are related to the weight of limbs.
Table 4.1 can be used to calculate these weights.
1.10 From Cooper and Glassow.
The arms swing back and forth in the act of walking.
The average force on the shoulder is calculated by using the following data and the data in Table 4.1.
The person has a mass of 70 kilograms and a length of 90 cm.
The total mass of the arms should be located at the center of the arm.
There is a carnival ride in which riders stand against a wall.
As the cylinder rotates, the floor of the cylinder drops and the passengers are pressed against the wall.
The arms will rise toward a horizontal position if a person stands on a rotating pedestal with his arms loose.
The physical pendulum model can be used to derive an expression for the amount of work done during each step.
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