# Thread: Trying to physically verify equation for Spring Mass model

1. Senior Member
Join Date
Dec 2015
Location
Wilton Street Glasgow
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## Re: Trying to physically verify equation for Spring Mass model

Hi Ted
I had a look at the links and there appears to be a fair amount of overlap in our interests .
Several years ago I was pondering exercise in micro gravity ( ISS) and the ongoing problem of maintaining tissue integrity in the lower extremities . As far as I am aware this is still a problem .

Here is an extract ( spelling errors included ) from something I dreamed up as a muscle loss counter measure and posted on podiatry arena . If you used self adjusting hydraulic or pneumatic hinges to prevent excessive rates of tissue loading I still feel it might work .

At the time the idea was novel but I have seen a few similar rigs used by researchers since .-

• Hi all
Why not use the muscular forces generated by one astronaut to apply force to and resist force from, the musculoskeletal system of another astronaut . In this way it may be possible to provide sufficient stimulus to avoid degradation of the various body systems .It would require a suitable framework to control the interface and the forces being applied could be measured by in-shoe instrumentation .
Any thoughts ?
Scotfoot
Gerrard Farrell

Glasgow

scotfoot, Oct 22, 2010
#6

• scotfootWell-Known Member

With regard to the previous post please consider the following .
First take a park bench made up of wooden slats and remove the back rest section .
Next take two individuals A and B and get them to lie flat on their backs on the bench pointing in opposite directions and with the soles of their feet touching . Next get them to inch towards each other along the bench but with the soles of their feet still touching ,till their legs bend at the knee to an angle of about 45 degrees and their legs are raised off the bench by about 40 cm or so .
Next introduce a foot board beween the feet of A and B so that the two individuals are now separated by it . Next take a rigid pole and attatch it to the middle of the lower border of the foot board and then run it down through the slats of the bench and attatch it to the ground via a hinge which will allow movement of the footboard in a direction roughly parallel to the long axis of the bench .Finally provide handles for A and B ,attatched to the bench ,that they can grip whilst their arms are extended by their sides .A and B are now in a position to apply forces to each others musculoskeletal systems .
The device would allow A to use both legs against one of Bs etc and could be used for eccentric and concentric exercise as well as for impact and non impact exercise .
Large ground reaction forces could be duplicated.
In a microgravity enviroment the anchor for the foot board pole could be provided by an extension of the main body of the framework thus providing a free floating , closed energy system tethered fore and aft to the body of a craft .
A bench would not be required to support A and B in a microgravity enviroment and so it could be replaced by a simple framework .
The device outlined above would weigh only a few pounds in a 1 g enviroment
Any thoughts ?
Scotfoot
Gerrard Farrell

Glasgow

scotfoot, Oct 28, 2010
#7

• scotfootWell-Known Member

Further to the previous 2 posts in this thread it may be possible to use a modified version of the exercise frame to target the peronial and tibialis posterior muscles.
This would be achieved in the following way .
Firstly , the pole attatching the footboard to the frame would be secured in a position perpendicular to the long axis of the frame by a locking device . Next , the pole could be continued up into a housing element in the footboard where it could be secured by a second locking device . When the lock on the pole section in the footboard is released the footboard would be able to rotate around the long axis of the pole . Subject A would then place his/her feet at on the board as far from the axis of rotation as possible to give maximum mechanical advantage . Subject B would place his/ her feet on the board close to each other and on either side of the axis . A would then rotate the footboard from side to side whilst B tried to resist the movement . This would involve many of the muscles of the body including the peroneals and tibialis posterior.
Any thoughts ?

Regards
Gerrard Farrell
(scotfoot)
Gerrard Farrell

Glasgow

scotfoot, Nov 4, 2010
#8

• scotfootWell-Known Member

Please note that in the last post "on either side of the axis " should read " on one side of, but close to the axis ".
Gerrard Farrell
(Scotfoot)
Gerrard Farrell

Glasgow

Foot forces during typical days on the international space ...

podiatryarena.com › MiscPodiatry Trivia
25/01/2014 · Foot forces during typical days on the international space station. Cavanagh PR, Genc KO, Gopalakrishnan R, Kuklis MM, Maender CC, Rice AJ. J...
Last edited by Gerrard Farrell; 05-04-2019 at 12:32 PM.

2. ## Re: Trying to physically verify equation for Spring Mass model

Chris, that's fascinating - I had never known about the jumping weights before but it reminds me of a training run I did years ago for the Pike Peak marathon - I found that I could run downhill super fast on the hairpin course by carrying a gallon jug of water and swinging it every time I went around a curve so I never had to slow down to stay on the track around the bends. Wonderful, Thank You!

3. Senior Member
Join Date
Jan 2011
Posts
90

## Re: Trying to physically verify equation for Spring Mass model

Ha! I would like to see a video of that, Edi. And surely beer would work even better than water?

4. ## Re: Trying to physically verify equation for Spring Mass model

I ran for years with the Tampa Bay Hash House Harriers but that was just a vacation ... very fun going from running at sea-level to running around about 8,000 feet for a week. Almost all the serious Pikes Peak running made it up there before me but I beat just about everyone on the way back down. I ran with a water jug because that way I still had a full jug when I reached the end ...

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