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Does counter-movement effect jump performance and does using the arms further this improvement when performing a vertical jump?

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  • Essay length: 2704 words
  • Submitted: 14/10/2008
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University Degree Sports Science

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Does counter-movement effect jump performance and does using the arms further this improvement when performing a vertical jump?

Introduction:

Vertical jumping contributes to performance in almost all sports, obviously some sports such as basketball use it a lot more that other sports such as tennis. When performing a motor task such as jumping, human beings typically start with countermovement (CM), CM can be described as a quick bend of the knees during which the body's centre of mass drops before being propelled upwards (Harman et al, 1990). There is evidence to support that task performance is improved with CM, for instance, it has been shown that subjects achieve a greater jump height with CM than without. This is because subjects are able to produce more work and/or use the work more effectively in a countermovement jump (CMJ) than a non-CMJ (Bobbert et al, 1996).

Researchers to date have proposed different theories as to why CM has a positive effect on vertical jump performance. Enoka (1988) cited in Harman (1990) proposed the performance enhancing effects of the countermovement is that concentric contraction immediately following an eccentric stretch begins with the muscle already under considerable tension, making

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