I’ve been real busy and apologize for my delay in responding to you. I met a man by the name of Dr Bill McCloud in back in 79 who made that statement to me (Most importantly, who said 90% of what we do earth is gravity free). We were just seated next to each other on a flight from Tampa to Atlanta. We developed a close friendship from that statement. In college I worked with NASA on the Sky Lab project and I felt I knew something about micro gravity…Bill changed my mind. He was the director of Biomechanics and research at the Houston Clinic in Columbus Georgia. I put it to the math concerning K calories to that statement as I had designed back packs for NATIC Army command for the purpose of carrying TOE missiles in combat. Page 3 and 4 of our Clinical training Manual attempts to explain this (down load here http://www.impulsepower.com/manual.htm ).
Think of in other ways:
Throw a baseball 60 feet at 80+ MPH…how far does it go horizontally vs vertically?
The take down in wrestling requires all your energy in putting the opponent off balance…then gravity does its job ….the opponent is moved horizontally (gravity free) then he falls and you follow.
In boxing all the force of the blow is in the inertia of the fists energy …less than2% gravity.
In Golf the ball rises 80 to 100 feet in a 300 yard drive…a 9 to 1 ratio.
Gravity gives you traction with the ground allowing you to convert energy in the body to huge projected forces. The earth has massive inertia. So, you press your small bodies’ inertia against the earth’s huge inertia and translate that energy in what ever direction is needed. This means that all activities are ultimately ground based (not gravity so to speak) as you use force against the ground to project force away from your body…gravity provides the initial traction but once you press your inertia against the earths you have much more traction than gravity alone can provide. Ex. in the sprint, ground forces at foot fall are greater that 6 times the body weight… and in the long jump at the plant 8 times body weight…the bulk of the forces above body weight are projected in the horizontal plane…(gravity free).
I could writ a book on this gravity free stuff sooo I’ll just move along.
“Should this knowledge affect how we train?”…Yes, that’s why I invented Inertial Exercise.
Your Dr Levin is correct in that the human model is supported entirely by synergistic tension.
Medieval rein actors have been practicing with the battleaxe and mace for 200 or more years…I think they are better exercises in battle ready actions than with the clubbell…you’ll get more fit and have a talent too. Warriors have been practicing with the mace for as long as time. It is a pure form on inertial exercise…interestingly; the infantry mace in just about all cultures weighs in at just about 1 Kgram or 2.5 pounds…our best acceleration workout weight. Warriors trained for starting power with a 4 Kgram or 9 pound maces ( the same weight we use for peak torque) and trained for battle with just sticks to develop velocity. As Job says in the bible…ain’t nothing new.
Club bells are in no way similar to inertial exercise…they just weigh too much are connected directly to your hand and therefore have a huge influence from gravity. We strive to remove gravity from the mass. In all sports you move the mass …not the mass and the weight. The weight is gravity pulling on the mass.
“Are technologies such as the versapulley and bodyblade similar?” Yes in that they are true Inertia trainers…but they operate produce different results that our Impulse Trainers.
The body blades have a fixed frequency. The force can very but the frequency is always fixed depending on the length of the blade from 3 to 6 rpm. The versa pulley has a long duration stress on tissue offers little acceleration (high G forces) training. Impulse training is exclusively dedicated to training high levels of acceleration and the corresponding effects on the bodies balance. The better the balance is trained the more acceleration the body develops and the greater the power developed. It is not uncommon to see impulse forces in excess of 1000 pounds with Impulse Training . Zero to peak forces are commonly in the less than 30ms time range. While the blade can accommodate the time range it will never produce even half the peak force of an Impulse Trainer.