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Related Concept Videos

Kinetic Energy - II00:56

Kinetic Energy - II

The kinetic energy of a particle is one-half of the product of the particle’s mass and the square of its speed. Note that just as Newton’s second law can be expressed as either the rate of change of momentum or mass multiplied by the rate of change of velocity, so too can the kinetic energy of a particle be expressed in terms of its mass and momentum, instead of its mass and velocity.
Kinetic Energy - I01:18

Kinetic Energy - I

It’s plausible to suppose that the greater the velocity of a body, the greater effect it could have on other bodies. This does not depend on the direction of the velocity, only its magnitude. At the end of the seventeenth century, a quantity was introduced into mechanics to explain collisions between two perfectly elastic bodies, in which one body makes a head-on collision with an identical body at rest. When they collide, the first body stops, and the second body moves off with the initial...
Kinetic Energy00:23

Kinetic Energy

Kinetic energy is the ability of an object in motion to do work or enact change. It can take on many forms. For instance, water flowing down a waterfall has kinetic energy. In biological systems, particles of light travel and are absorbed by plants to create chemical energy. Animals consume the chemical energy and give off molecules that carry their scent through the air. They also generate kinetic energy when they run away from predators. Entire systems also possess kinetic energy, like the...
Energy Diagrams - I01:14

Energy Diagrams - I

The dynamics of a mechanical system can be easily understood by interpreting a potential energy diagram. Since energy is a scalar quantity, the interpretation of the dynamics of the system becomes even simpler.
Take the example of a skater on a parabolic ramp. The potential energy at different points along the ramp will be proportional to the height of the ramp, which varies quadratically with the horizontal position on the ramp. As the skater moves down the ramp from the highest position,...
Types of Kinetic Energy01:14

Types of Kinetic Energy

The amount of kinetic energy of an object depends on its mass and speed. Consider two balls of different masses rolling down an inclined plane at the same speed. The heavier ball will have more kinetic energy. Similarly, when two balls of the same mass roll down an inclined plane at different speeds, the ball that moves faster has more kinetic energy.
There are several different forms of kinetic energy, including mechanical, electrical, radiant, and thermal energy. Mechanical energy is...
Energy Supply for Muscle Contraction01:25

Energy Supply for Muscle Contraction

Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...

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Related Experiment Video

Updated: May 23, 2026

Determining the Contribution of the Energy Systems During Exercise
11:15

Determining the Contribution of the Energy Systems During Exercise

Published on: March 20, 2012

Energetics of basic karate kata.

Jens Bussweiler1, Ulrich Hartmann

  • 1Institut für Angewandte Trainingswissenschaft, Marschnerstrasse 29, Leipzig, Germany. bussweiler@iat.uni-leipzig.de

European Journal of Applied Physiology
|March 24, 2012
PubMed
Summary

Karate Kata energy demands are primarily met by anaerobic alactic metabolism, not anaerobic lactic pathways, challenging common training assumptions. This study analyzed energy supply during specific Karate movements to understand metabolic costs.

Area of Science:

  • Sports Science
  • Exercise Physiology
  • Combat Sports Analysis

Background:

  • Effective Karate training requires understanding energy systems during exercise.
  • The role of anaerobic lactic metabolism in Karate Kata is often overestimated.
  • Previous assumptions about lactic energy dominance in Karate lack empirical confirmation.

Purpose of the Study:

  • To analyze the metabolic cost and fractional energy supply during Karate Kata (Heian Nidan).
  • To investigate the contribution of different energy systems (aerobic, anaerobic alactic, anaerobic lactic) during sport-specific movements.
  • To challenge the prevailing belief in the dominance of anaerobic lactic metabolism in Karate.

Main Methods:

  • Six male Karateka performed Karate Kata (Heian Nidan) once and twice continuously.

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  • Oxygen uptake was measured using portable spirometry.
  • Blood lactate concentrations were analyzed pre- and post-exercise, with fractional energy supply calculated.

    • Main Results:

    • Anaerobic alactic metabolism supplied an average of 52% of energy for one Kata, with anaerobic lactic at 25% and aerobic at 23%.
    • For two sequential Kata, energy supply shifted to 33% anaerobic alactic, 25% anaerobic lactic, and 42% aerobic.
    • Despite high blood lactate levels (up to 8.1 mmol/l), the lactic energy fraction was only 17-31%.

    Conclusions:

    • The study refutes the hypothesis of significant anaerobic lactic energy metabolism dominance in short, intense Karate Kata.
    • Energy supply during Karate Kata relies more heavily on anaerobic alactic and aerobic pathways than previously assumed.
    • Findings suggest a need to revise Karate training concepts based on actual energy system utilization.