by NBK Tue Jul 01, 2014 5:49 pm
Anatol wrote:One principle in Judo for me is "Water".
It has heavy weight, many forms (from ice to fog) and moves in waves and circles and has incredible power.
Also the human body is mostly of water.
Laozi 78 (translated by Feng & English)
Under heaven nothing is more soft and yielding than water.
Yet for attacking the solid and strong, nothing is better;
It has no equal.
The weak can overcome the strong;
The supple can overcome the stiff.
Under heaven everyone knows this,
Yet no one puts it into practice.
What do you think in terms of "Judo" and "Water"? Drink a lot of water so you do not get dehydrated? ;-)
I don't know what to make of water.
Moving water, maybe... which can make waves.
Nanatsunokata, Endōnokata, and Jōgenokata
Abstract
Hirano Tokio (1922-1993) was a talented jūdō champion who developed his own pedagogical approach towards teaching and practicing kuzushi (unbalancing) and tsukuri (preparation), two critical skills for successfully applying jūdō throws. In his approach, Hirano emphasizes the use of rotational unbalancing preceded by strategic movements that mimic water waves. No biomechanical analysis of Hirano’s wave system has previously been attempted. The purpose of this paper is to provide a detailed survey of Hirano’s didactic system comparing it with traditional Kōdōkan teachings, and to assess its biomechanical foundations. The fluid dynamic modeling of the several kinds of waves proposed by Hirano is mathematically complicated and heavily relies on Boussinesq differential equations. Given the involvement of numerous parameters in determining the hydrodynamic behavior of water (depth, period of waves, saliency, temperatures, currents, shape of the coastal line, water density, wind) which are absent in the surroundings of a pair of two jūdōka moving indoors on a tatami, Hirano’s system appears limited to a mere visualization and metaphysical interpretation of jūdō. The lack of empirical and experimental data available obtained in large groups of students taught according to Hirano’s approach make it so far impossible to conclude whether it facilitates kuzushi and tsukuri skill acquisition.
Ultimately Hirano’s wave‐based kuzushi/tsukuri does not alter the biomechanical analysis previously proposed by Sacripanti, as it still is all about general action invariants aimed to close the distance between both opponents, to break the opponent’s symmetry, and to apply one of the infinite options to achieve this.