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Scientists measure how energy is spent in martial arts
Date:3/19/2012

Two judo fighters face off, one in a white judogi (the traditional judo uniform) and one in blue. They reach for each other's shoulders and lock arms, in what looks like an awkward dance, before the fighter in blue throws his opponent head-over-feet onto the mat.

Judo and mixed martial arts have become increasingly popular over the past few years and scientists have taken note. The two fighters were actually filmed as part of a science experiment that demonstrates how researchers can quantify exactly how the athletes are spending their energy. The video will be published in JoVE, the Journal of Visualized Experiments, the only peer reviewed, PubMed-indexed science journal to publish all of its content in both text and video format.

Previously, researchers have only been able to study predictable sports that are easy to replicate in the laboratory, such as running. With this new method, scientists will be able to study the team and individual sports that have previously been neglected.

"Each sport has specific characteristics which confer different metabolic demands to them," said paper-author Dr. Emerson Franchini. "One of the most important aspects of the metabolic demand is the relative contribution of the energy systems."

Three energy systems are used in exercise: the aerobic metabolism, which uses oxygen to convert nutrients into energy; lactic anaerobic metabolism, which doesn't require oxygen and makes energy exclusively from carbohydrates, with lactic acid as a by-product; and alactic anaerobic metabolism, which makes energy without oxygen and doesn't produce lactic acid.

In this article, the researchers chose to study judo, a complex and unpredictable sport. To figure out the relative contributions of each energy system, the researchers recorded the participants' resting oxygen consumption, and used a portable gas analyzer (which looks a little bit like a mini jet-pack) to measure exercise oxygen c
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Contact: Katherine Scott
katherine.scott@jove.com
617-765-4367 x301
The Journal of Visualized Experiments
Source:Eurekalert  

Page: 1 2

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