7starmantis said:
Ok, I may just be a little daft, but I'm not sure I understand your point here. I mean I understand letting your attack carry through. We do that alot in mantis, and I understnad grabbing the hand, or hitting the hand with a strike or kick, we use that as well. However, it seems that striking the body with the opposite hand is a wasted movement no? It ties up both hands while you may need the other hand to block or attack. Slapping your own chest while striking takes away part of your defense or guard. Also, slapping a moving stirke not only removes power from it but changes its direction (even if minimally). How do you combat these issues while using the slapping technique? I mean, I'm not suggesting chambering yoru attacks at all (I am of course a mantis person) but applying a slap (force) to your attack removes needed precision in my opinion and occupies both hands while only utilizing one. Voluntarily adding a changing point to a strike would be a bad habit to get into in drills no? Or is this something done in forms and drills that is not used in application or fighting?
I guess I understand your explination as far as "rebounding" but that dose not apply to slapping ones own chest with one hand while striking with the other does it?
7sm
To start, I don't advocate self-slapping for self-slapping's sake. We don't just Kong thump ourselves. The slap checks and proprioceptive self-cues -- properly used -- contact self at specific points in movement. Unfortunately, this application in kenpo was under-represented in the main, and is largley ignored or lost. But not completely.
The functions are both biomechanical, and proprioceptive, and are placed and timed to accentuate an action, rather than stunt it. As a study, like I metioned, most kenpo folk don't do it well...unless, by chance, they have cross-trained in a kung-fu system that includes similar body checking mechanisms. Most attempt to mimic Mr. Parkers slapping, and without the information about how and why, create mis-steps. Like slapping the chest when it don't apply.
An example: In kenpo is a technique called 5 swords. It is a "recent" development over an older "7 swords". In newer versions, there this whole bending the guy over thing. I mention this so that kenpo readers will know that I'm not holding to the bending-over version, but rather to a peppering-the-guy version.
In it, there is a sequence of movements in about the middle...right foot forward stance: Right vertical punch (delivered low, like an uppercut), followed by a left outward handsword to the high line with the rear hand, followed by a right inward handsword to the same area with the lead hand. The uppercut is supposed to be a power move. The right inward handsword is supposed to be a power move. The left outward handsword, sandwiched in the middle, is a short move to help gauge the distance and location of the target for the right inward chop. Delivered with chambering, they would be three distinct movements, with the hands either chambered at the hip as in karate, or held up in checks as in chinese systems.
A biomechanics side track: For each joint, the body has some directions it likes to move, and some it ain't so fond of. Joint mobility is typically allowed degrees of freedom in one plane, but limited freedom in another. Consider the knee: Great flexion/extension, not so great to have that same amount of joint surface translation in the side-to-side direction. To prevent or limit movement in the medial-lateral plane, MCL and LCL ligaments act as "check ligaments", checking the side to side movement. Now, if there is a consciously controlled movement in the directions allowed by the joint, and the movement is ballistic and fast (such as throwing a front snap kick), the body will avoid subluxation or injury to the joint by neurologically inhibiting that action...i.e, slowing it down before it gets too far. This happens unconsciously, and reflexively, as the instability near the end of the range of motion is sensed in the receptors in the joint. In studies with "locking" knee braces with very minor plasticity at end range (tight springs, rather than locking hinges) subjects kicked harder (soccer sports physio experiment, with a psi measure-thingy on the ball/target) when the knee had an artificially-induced stopping point, then when the athlete had to stop the forward momentum of the kick themselves. So, let's go back to the 5-swords..
On the uppercut with the right hand, the body will beging slowing it down if it is unsure of the distance left to travel, or force expenditure upon reaching the target. So, as the right hand shoots to the blow, the left hand slaps the right biceps, just where it starts to ascend under the anterior deltoid. This acts as a temporary check ligament, giving the body a cue as to when it's good to stop, how far it's safe to proceed without damage. That uppercut can be thrown harder in close quarters then one without that slap-check. (try it on a heavy bag). Additionally, the left hand is now "proprioceptively primed". With the body always asking "where am I?", the more feedback we can give all the parts, the better job the brain can do of coordinating the movement and power of these parts in synchrony.
So, the left chop takes off to it's target from the right bicep check location, instead of from a hip or floating check. Try throwing left outward chops in each of the 2 following ways...1) hand "near" the right shoulder, but not touching, and note the reaction time from when you say "go" in your head, to when it hits, as well as how HARD it hits, then 2) just touch your right shoulder with one finger of that left hand, and note the reaction time.
Next...why the slap, then, if it only takes a touch? Any strong agonist activity also increases attenuation of the muscles in the antagonist. So, bringing your hand sharply to you, and thumping/pulling into your own body, also raises the tonicity, conversely lowering the level of activation for primary agonistic contraction, of the muscle that would fire it off in the opposite direction (a flexed bicep makes it easier to fast-fire a tricep then a flaccid arm). In short, the left chop can take off from the runway faster after slapping self. The appearence of the whole thing is that we just slapped ourselves on the chest (which some do, not knowing any differently), but what we really did was to target the upper humerus, to provide a temporary check ligament against the forward translation of the arm in forward flexion and elevation (the planes of movement the shoulder engages in with an uppercut).
The final inward handsword...prior to throwing it, it should move (as the short left chop goes out) up toward the head, with a couple fingers touching the crown of the skull, and the palm turned as if about to throw a baseball pitch. Why? good god...I've got a 150-page text here on the biomechanics of throwing that I couldn't possibly summarize in this post. Suffice it to say the mechanics of a 90-mile per hour pitch generate more force at the end of the stroke than a "point of origin to point of contact" inward chop that comes from a floating check positioned towards the front of the body.
The backnuckle delivered to the side of the body is another great example of common slap-check application, but rather than re-write it, I'll try to find the post and paste a link to the thread. In a nutshell, the slap is again placed at the front of the shoulder joint, to act as a check ligament. The body senses the increased stability, and no longer fearing posterior-to-anterior sprain, strain, or luxation of the gleno-humeral joint, no longer inhibits the backnuckle musculature, taking the speed and power out of it in mid-flight. It is allowed to complete it's path with full recruitment, because a safety mechanisms has been super-imposed over the proprioceptors and mechano-receptors of the joint.
So, the slaps, properly done, are placed to AID in the generation of power, and not inhibit it. But, again, you won't see this in a lot of the kenpo out there. While most do the 5-swords uppercut check at the biceps, that's about where it ends.There should be self-slaps accompanying almost every move in every technique and form, but with the absence of proper information about how and why, it's just noise and interference. Content, without context, lacks meaning.
Regards,
Dave