4 ms·

It takes a few clicks to get to the supplemental data movie: https://rs.figshare.com/articles/media/a_participant_running_on_WoD_from_Horizontal_running_inside

It takes a few clicks to get to the supplemental data movie: https://rs.figshare.com/articles/media/a_participant_running_on_WoD_from_Horizontal_running_inside_circular_walls_of_Moon_settlements_a_comprehensive_countermeasure_for_low-gravity_deconditioning_/25530021 https://rs.figshare.com/articles/media/a_participant_running... You'd probably want to switch directions often!

alex_young 2y ago
Why? The bungee cord is only needed for earth gravity.
- purpleidea 2y ago
  Because the moon still has gravity, and there would be some asymmetrical force on your legs either which would be reversed if you went the other direction. So switch directions all the time to be less lopsided.
  - alex_young 2y ago
    The moon has a sixth of earth gravity. The force you would feel would be very small and the whole point of this is to increase the resistance against the wall you’re running on. If you’ve ever been on a spinning wheel at a carnival where they move the whole thing 90 degrees it would be a bit like that. The track would actually be straight, so you wouldn’t have to compensate for turning even. I’m not saying you wouldn’t want to switch directions, but there shouldn’t be some imperative to do so often.
  - pmontra 2y ago
    The runner will feel a pull to the left, as if the track had a slope in that direction. I wonder if that could give motion sickness to somebody. Probably people sent to the Moon will be selected against that because of the journey to and from the Moon but I really have no idea about that. Another problem, as pointed out by someone else in the comments, is that the floor is not flat but points upward and the feet and ankles might feel that. Furthermore it's another possible source of motion sickess (flat but not flat.)
- pwr22 2y ago
  It's not a symmetric exercise, look at the feet. You'd probably want to keep the overall workout balanced by alternating periodically?
  - volemo 2y ago
    I.e. “don’t skip the left day!”
  - scotty79 2y ago
    It's because walls are a bit too steep. If you made them into paraboloid, a per would naturally climb as high as they need to, to be able to run symmetrically.
    - ordu 2y ago
      But one leg will still be running a shorter distance then the other.
      - croon 2y ago
        This is steaming my brain a bit. Is it not the case (assuming an "optimal" tilt of the track) that the inner leg would travel more radii each step, meaning you would travel a larger segment of the circle on every inner step than outer step, ending up with an equal gait? This is my intuition without any formulated proof.
      - scotty79 2y ago
        Person running would need to constantly turn a bit to one side to not climb further up the wall. So it shouldn't be much different from running in circles on flat surface. Not sure if runners that train by running in small circles are concerned about evenness and try to run the same amount clockwise and counter clockwise to even things out.
        alex-korr 2y ago
        Yes for sure. Track running can result in injuries on the left side usually in the foot/ankle area.
BLKNSLVR 2y ago
The ankle flex when the right foot lands makes me wince every single time. I wonder how much that's to do with the direction of gravity, the angle of their body looking not quite horizontal (and therefore 'weirding' the angle that feet hit the ground), and how much is to do with the individual's physiology.
- funnym0nk3y 2y ago
  You could build it with a slight angle. Or gradually steeper like a high speed race track.
  - nickff 2y ago
    The ‘bowls’/balls used for motorcycle stunt riding might be good examples for this (and could be fun).
- sandworm101 2y ago
  In actual lunar gravity the forces should balance out. At a particular speed, tied to the wall angle, the forces should align with the floor to let the foot land as if running on a horizontal surface. Imaging a motorcycle in a turn. Then tilt the road to match the bike's lean angle. The tire/foot then falls flat against the road.
  - s1artibartfast 2y ago
    due to the angles, it would be like running in a circle on earth. It is mostly a question of what the equivalent earth track diameter is. It can be quite painful and damaging to run in small circles.

alex_young 2y ago

Why? The bungee cord is only needed for earth gravity.

purpleidea 2y ago
Because the moon still has gravity, and there would be some asymmetrical force on your legs either which would be reversed if you went the other direction. So switch directions all the time to be less lopsided.
- alex_young 2y ago
  The moon has a sixth of earth gravity. The force you would feel would be very small and the whole point of this is to increase the resistance against the wall you’re running on. If you’ve ever been on a spinning wheel at a carnival where they move the whole thing 90 degrees it would be a bit like that. The track would actually be straight, so you wouldn’t have to compensate for turning even. I’m not saying you wouldn’t want to switch directions, but there shouldn’t be some imperative to do so often.
- pmontra 2y ago
  The runner will feel a pull to the left, as if the track had a slope in that direction. I wonder if that could give motion sickness to somebody. Probably people sent to the Moon will be selected against that because of the journey to and from the Moon but I really have no idea about that. Another problem, as pointed out by someone else in the comments, is that the floor is not flat but points upward and the feet and ankles might feel that. Furthermore it's another possible source of motion sickess (flat but not flat.)
pwr22 2y ago
It's not a symmetric exercise, look at the feet. You'd probably want to keep the overall workout balanced by alternating periodically?
- volemo 2y ago
  I.e. “don’t skip the left day!”
- scotty79 2y ago
  It's because walls are a bit too steep. If you made them into paraboloid, a per would naturally climb as high as they need to, to be able to run symmetrically.
  - ordu 2y ago
    But one leg will still be running a shorter distance then the other.
    - croon 2y ago
      This is steaming my brain a bit. Is it not the case (assuming an "optimal" tilt of the track) that the inner leg would travel more radii each step, meaning you would travel a larger segment of the circle on every inner step than outer step, ending up with an equal gait? This is my intuition without any formulated proof.
    - scotty79 2y ago
      Person running would need to constantly turn a bit to one side to not climb further up the wall. So it shouldn't be much different from running in circles on flat surface. Not sure if runners that train by running in small circles are concerned about evenness and try to run the same amount clockwise and counter clockwise to even things out.
      - alex-korr 2y ago
        Yes for sure. Track running can result in injuries on the left side usually in the foot/ankle area.

BLKNSLVR 2y ago

The ankle flex when the right foot lands makes me wince every single time. I wonder how much that's to do with the direction of gravity, the angle of their body looking not quite horizontal (and therefore 'weirding' the angle that feet hit the ground), and how much is to do with the individual's physiology.

funnym0nk3y 2y ago
You could build it with a slight angle. Or gradually steeper like a high speed race track.
- nickff 2y ago
  The ‘bowls’/balls used for motorcycle stunt riding might be good examples for this (and could be fun).
sandworm101 2y ago
In actual lunar gravity the forces should balance out. At a particular speed, tied to the wall angle, the forces should align with the floor to let the foot land as if running on a horizontal surface. Imaging a motorcycle in a turn. Then tilt the road to match the bike's lean angle. The tire/foot then falls flat against the road.
- s1artibartfast 2y ago
  due to the angles, it would be like running in a circle on earth. It is mostly a question of what the equivalent earth track diameter is. It can be quite painful and damaging to run in small circles.