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Principle of Aiki and its Application in Aikido and Aikijujutsu
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Katata Dori

Morihiro Saito Sensei. Katata Dori

The application of Aiki in the technique demonstrated By Morihiro Saito is analysed below.

Analysis

Uke holds Tori's wrist. Tori steps to the side to push Uke's arm in the same direction. As Tori steps to the side, Uke momentarily relaxes his arm to allow him to realign his hips by applying a muscle torque about his right ankle joint so as to move his hips to the rear to resist the push in the sidewards direction by pulling back. The upward atemi to the face induces Uke to apply Aiki by reversing the muscle torque about his ankle joint in an attempt to move his head upwards to reduce the impact of the atemi. This action unbalances Uke as he pulls back. Aiki-Lead

Aikijutsu Hiden

The application of Aiki in the technique demonstrated is analysed below.

Analysis

In this video at 9.26, Uke holds Tori's left wrist with his right arm. To unbalance Uke, Tori induces Uke to apply Aiki by applying pressure to a nerve in Uke's forearm using the bone at the base of his index finger of his right hand. This action is illustrated in more detail at a time of 11.16. The pain created, by the pressure on the nerve, induces Uke to bend at the waist and also to bend his elbow. The latter causes Uke to pull with his right arm and the former unbalances Uke as he reverses the muscle torque about his waist joint as he pulls. Tori rotates his wrist to turn Uke's forearm upwards so that he can apply downward pressure to the nerve so that Uke bends at the waist to relieve the pressure. Aiki-Lead

The next technique at a time of 9.50 applies Aiki in a similar way.

Tony Annesi - Aiki Refinements 3

The application of Aiki in the technique demonstrated by Tony Annesi is analysed below.

Analysis

At a time of 05.20 Uke holds Tori's left wrist with his right arm. Tori induces Uke to apply Aiki by Tori transferring his weight onto his rear foot and lowering his body causing Uke to momentarily relax his upper body while preparing his lower body to pull upwards as Tori steps to the side with his front foot. The action of Uke pulling upwards causes the muscle torque about the foot joint of his right foot to be in the reverse direction to that required to balance the pulling reaction force due to Tori moving to the side, causing Uke to become unbalanced. Aiki-Lead

Daito Ryu Aikijujutsu with Roy Goldberg Sensei

The application of Aiki in the technique demonstrated by Roy Goldberg is analysed below.

Analysis

In this video Tori extends his arm towards Uke as Uke steps forward to grab Tori's wrist. At the moment that Uke closes his grip, Tori induces Uke to apply Aiki by rotating his wrist. This action causes Uke to follow Tori's wrist by reversing the muscle torque about the ankle joint of his front foot. Consequently, Uke is unbalanced to the front by his forward momentum. Aiki-Feint

2020 Systema Ryabko. Basic principles. Part 1

The application of Aiki in the techniques demonstrated by Lev Ivanov is analysed below.

Analysis

At a time of 0.31, Uke holds Tori's wrists and pushes. Tori induces Uke to apply Aiki by withdrawing and lowering his body/wrists.  This movement induces Uke to momentarily relax his upper body and prepare his lower body to resist the downward movement by extending his legs to push upwards. Uke is then unbalanced by Tori rotating his wrists to the rear. This is because the muscle torque about Uke's ankle joints are then in the opposite direction to resist being pushed to the rear. Aiki-Lead

Analysis

At a time of 1.19, Uke holds Tori's wrists. Tori induces Uke to apply Aiki by lowering his body/wrists. The downward movement induces Uke to momentarily relax his upper body and prepare his lower body to resist the downward movement by extending his legs to push upwards. Uke is then unbalanced to the front, because the muscle torque about Uke's front foot joint is then in the opposite direction to resist being pulled forward. Aiki-Lead

Analysis

At a time of 1.34, Tori extends his arms towards Uke and Uke steps forward to grab Tori's wrists. At the moment that Uke closes his grip, Tori induces Uke to apply Aiki by withdrawing his wrists. This action causes Uke to follow Tori's wrists by reversing the muscle torque about the ankle joint of his front foot. Consequently, Uke is unbalanced to the front by his forward momentum. Aiki-Feint