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Force and momentum are intimately related. Force acting over time can change momentum, and Newton's second law of motion can be stated in its most broadly applicable form in terms of momentum. Momentum can be applied to systems where the mass is changing, such as rockets, as well as to systems of constant mass. Also, momentum continues to be a key concept in the study of atomic and subatomic particles in quantum mechanics. One can consider systems with varying mass in some detail; however, the...
Free-falling Bodies: Introduction01:07

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All objects, neglecting air resistance, fall with the same acceleration towards the Earth's center due to the force exerted by the Earth's gravity. This experimentally determined fact is unexpected because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavier ones. People believed that a heavier object had a greater acceleration when falling until Galileo Galilei (1564–1642) proved otherwise. We now know this is not the case.
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Impact: Problem Solving

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Free-falling Bodies: Example01:05

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Related Experiment Video

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Importance of Jumping Ability in Handball Throwing Speed and Accuracy
02:43

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Published on: April 4, 2025

Acute effect of drop jumping on throwing performance.

Gerasimos Terzis1, Konstantinos Spengos, Giorgos Karampatsos

  • 1Department of Track and Field, School of Physical Education and Sport Science, University of Athens, Athens, Greece. gterzis@phed.uoa.gr

Journal of Strength and Conditioning Research
|October 28, 2009
PubMed
Summary

Drop jumping before throwing significantly enhances shot put performance, particularly in individuals with a higher percentage of type II muscle fibers. This effect was more pronounced in men than women, correlating with muscle fiber composition and leg strength.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • The stretch-shortening cycle is crucial for explosive athletic movements.
  • Optimizing pre-performance activities can enhance throwing velocity and distance.

Purpose of the Study:

  • To investigate the acute effects of drop jumping on shot put performance.
  • To determine the relationship between muscle fiber characteristics, strength, and performance enhancement.

Main Methods:

  • Participants performed shot put throws before and after drop jumps.
  • Muscle biopsies assessed vastus lateralis fiber type and cross-sectional area.
  • Leg press 6-repetition maximum (RM) measured muscular strength.

Main Results:

  • Throwing performance significantly increased post-drop jumping (p < 0.01).
  • Type II muscle fiber area percentage strongly correlated with performance improvement (r = 0.76, p < 0.01).
  • Men showed significant improvement, unlike women, correlating with higher type II fiber percentages.

Conclusions:

  • Drop jumping acutely enhances throwing performance, especially in individuals with higher type II muscle fiber composition.
  • Leg strength is a secondary factor influencing performance gains from drop jumping.
  • Gender differences in performance enhancement relate to muscle fiber type distribution.