Shock vs Vibration

I remember reading about vibrating palm a long time ago.

The thing about terminology is that the person using it may not understand what the term really means.

Neither does the average reader like me. So I went on thinking that vibrating palm is like a super duper powerful strike.

A decade, maybe two or three, I have a better understanding of what the term vibration and by extension vibrating means as it relates to rotating machinery.

This is where I realized that those who called their palm strike by the name vibrating palm may not understand what vibration is about and as such has given a meaningless term to what they do.

There’s a study here on the impact on the wrist from playing different sports. Unfortunately, there’s nothing on the impact of striking though catching a ball would be closer to what impact would be like from striking. The author concluded that the three worst events are :-

i) Throwing a baseball
ii) Catching a football
iii) Hitting a volleyball

Of the three it looks to me that the football catch and volleyball hit would be the closest to what impact on the wrist would be like if you are punching with a fist as the motion affects the z-axis.

By comparison, the baseball throw sees the wrist moving more over three axes and is more like what a hand slap / relaxed palm strike would be like.

The author concluded that :-

a) The level of vibration affecting the wrist is low. Extrapolating this conclusion onto a vibrating strike by referencing baseball, football and volleyball I suspect that the term vibrating strike would be a misnomer!

b) Sports that are more damaging on the wrist are those that tend to cause the bones and ligaments to absorb a sudden high level of shock.

If this is true then I would think that the relaxed palm strike aka vibrating palm is actually generating shock force rather than vibration. If you study how the body moves when going through the motions of a powerful palm strike you are likely to see the entire body move in a sinuous manner, a movement pattern that allows acceleration to build up before suddenly dumping the accumulated force into a target in the form of a shock energy.

This is why the energy of a palm strike is sometimes compared to that of a wave motion. This being the case a vibrating palm should properly be termed a shock palm.

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