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Related Concept Videos

Rigid Body Equilibrium Problems - II01:21

Rigid Body Equilibrium Problems - II

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A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
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Related Experiment Video

Updated: Dec 28, 2025

Experimental Methods to Study Human Postural Control
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Postural control in karate practitioners: Does practice make perfect?

Amit Hadad1, Natalie Ganz1, Nathan Intrator2

  • 1Center for the Study of Movement, Cognition, and Mobility, Neurological Institute, Tel Aviv Sourasky Medical Center, Israel.

Gait & Posture
|February 15, 2020
PubMed
Summary
This summary is machine-generated.

Experienced karate practitioners demonstrate superior postural control compared to swimmers. This study highlights karate

Keywords:
EntropyEquilibriumExerciseFloor touchesMartial artsPostural balance

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Area of Science:

  • Sports Science and Biomechanics
  • Motor Control and Learning
  • Exercise Physiology

Background:

  • Karate training is hypothesized to enhance postural control.
  • Previous research findings are inconsistent and often lack appropriate comparison groups.
  • The specific impact of karate on balance compared to other physically active individuals is not well-established.

Purpose of the Study:

  • To investigate whether experienced karate practitioners exhibit better postural control than experienced swimmers.
  • To compare postural control in athletes with and without specific upright balance demands in their training.
  • To explore the specificity of training effects on balance.

Main Methods:

  • A cross-sectional study involving 20 male karate practitioners and 20 male swimmers (ages 20-50).
  • Participants performed four increasingly difficult standing postural control tasks.
  • Measures included behavioral balance loss (foot touches) and center-of-gravity movement complexity (Shannon entropy).

Main Results:

  • Karate practitioners showed significantly fewer foot touches in one-legged stance tasks (eyes open/closed with cognitive load) compared to swimmers (p < 0.001).
  • Lower complexity of center-of-gravity sway (Shannon entropy) was observed in the karate group (p = 0.002).
  • Task-related differences in postural control were evident across all measures.

Conclusions:

  • Karate training is associated with enhanced postural control, even when compared to a physically active control group.
  • Findings support the principle of specificity in exercise training.
  • Karate may serve as a preventative strategy against age-related balance decline.