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Levers

For your arm, leg or any body part to move the appropriate muscles and bones must work together as a series of levers. A lever comprises of three components -

  • Fulcrum or pivot - the point about which the lever rotates
  • Load - the force applied by the lever system
  • Effort - the force applied by the user of the lever system

The way in which a lever will operate is dependent on the type of lever.

Classification of Levers

  • Class 1 - The fulcrum lies between the effort and the load
  • Class 2 - The fulcrum is at one end, the effort at the other end and the load lies between the effort and the fulcrum
  • Class 3 - The fulcrum is at one end, the load at the other end and the effort lies between the load and the fulcrum
Class 1 lever
Class 1 Lever
Class 2 lever
Class 2 Lever
Class 3 lever
Class 3 Lever

Class 3 is the most common class of lever to be found in the human body.

Examples in strength training

Davis et al. (2000)[1] provides the following examples of levers in the human body:

  • Class 1 - Seated dumbbell triceps extension
  • Class 2 - Standing heel lift
  • Class 3 - Seated biceps curl
Class 1 Lever in the body
Class 1 Lever in the Body
Class 2 Lever in the body
Class 2 Lever in the Body
Class 3 lever in the body
Class 3 Lever in the Body


References

  1. DAVIS, B. et al. (2000) Physical Education and the Study of Sport. London: Harcourt Publishers. p. 237-238

Related References

The following references provide additional information on this topic:

  • TOZEREN, A. (2000) Human body dynamics: classical mechanics and human movement. Springer

Page Reference

If you quote information from this page in your work then the reference for this page is:

  • MACKENZIE, B. (2003) Levers [WWW] Available from: https://www.brianmac.co.uk/levers.htm [Accessed

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