It's not "decades old" and this monography was used in defense of a candidate / doctoral dissertation, so it's pretty legit. If you have newer information, I'm open to suggestions.
Also,
@Sano, I'm interested in your opinion on the topic of level of participation of different body parts in punching movement. BTW, to not broaden the topic further, I'm speaking about two main KO punches to the head - cross and left hook.
Main points
The effectiveness of a boxing strike according to experts largely depends on the following main factors:
1. Repulsive leg extension by 39%, rotational-translational movement of the body by 37% and extensor movement of the arm by 24%.
2. The level of development of speed-power abilities muscles of the legs, trunk and arms.
3. The punch braking of the parts of the body, with which occurs sequential braking from proximal links (leg) to distal (arm), i.e. starting with the leg and ending with the fist of the beating hand.
4. The axis of rotation, which when applying an accented blow with the right hand should pass through left leg and left shoulder (when applying an accented blow with the left hand, the axis of rotation must pass over the right shoulder and right leg).
5. The ability of the leg muscles to quickly develop maximum effort at the initial moment of movement (explosive and starting power).
6. Advance movement of the pelvis in relation to upper shoulder girdle, which leads to stretching muscles of the trunk and shoulder muscles of the beating arm, accumulating thereby the potential energy of elastic deformation.
7. Starting and explosive strength of the muscles of the hands, ie from ability to exert great effort at the beginning of the movement.
8. The maximum speed of the fist at the time collisions (8-10 m/s).
9. Stiffness in the kinematic chain (arm), blocking movements in the wrist, elbow and shoulder joints, which is achieved by maximally strong brush compression.
10. The position of the forearm during the collision to the place hit, which should be perpendicular to the target.
@TheMaster
P.S. As for Dempsey and other famous boxers - watch teh DAMN LEGS! As of using Fedor GnP as an example of no-legs-in-punching - LOL, as my buddy said: it's just ignorance of the basic laws of physics by someone.
P.P.S. If I re-post this "only arms" bullshit somewhere in ex-Soviet striking forums, Western reputation about punching would be ruined forever
. It's like common knowledge everywhere... but US?