Transmissions in daily life, Part 1

The blog entry “Daily failures, part five” presented a transmission and an example for its usage. If you take a closer look, you will notice that transmissions are nothing special in your daily life. Basically, every human movement consists of several combined transmissions. Remember, a transmission is just translating one movement form into another form, e.g. round to straight movements and vice versa.

Imagine a straight punch: Even though you have a linear motion in mind, your body has no possibility to create this mental image directly. Every bone is connected to another bone with joints (there are some exceptions, though). This means that every movement of a bone is a rotation in relation to its next neighbor. In other words, the human body has to use rotations to create linear movements. A straight punch is a minimum combination of two rotations; shoulder to upper arm and upper arm to lower arm. In that case, the fist is rigidly fixed to the lower arm. You can add more rotations by twisting your body and using your legs.

 

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As a result, numerous new problems emerge. Small deviations from the intended rotation are enough, and the planned linear movement goes awry. So the need to combine rotations in order to obtain linear movements is a fundamental motor control problem.

Knowledge about these relations can be used to optimize your own movements or to hinder an opponent’s movements. It is often enough to manipulate just one of your opponents rotations instead of the whole chain. The other way round, you have to make sure that your own rotations have sufficient tolerance to deviations.

 

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The post was published 10. January 2014 related to the category Miscellaneous and tagged with .