PPT Slide

Work = Force x distance traveled

Note: Force is not mass, it is mass x acceleration of gravity (distance in an exercising subject is not the length of the run)

• Work is a mathematical relationship that does not have a psychological component. It is the same for all subjects no matter what their demographics, and its cost must be paid by some type of energy.

• In exercise, thye largest component is done in the vertical plane, e.g. raising the the center of gravity. This makes it a very difficult to calculate in an exercising subject.

• There are also other types of work e.g. pressure-volume.

Power = F x d x t-1

Work done per unit time

• Thus, to increase power, one must:

• Exert a greater force in a given time

• Move over a greater distance in a given time

• Perform the same work in a given time

1 Watt = a. 6.12 Kpm x m-1

b. 0.73756 ft-lbs x s -1

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