Christopher Carr and Jeremy McGee of MIT recently published The Apollo Number: Space Suits, Self-Support, and the Walk-Run Transition, which explores the origin of the difference between an earthbound walk-run transition and the same event under varying gravity conditions in space suits.
The walk-run transition is exactly what it sounds like - the velocity at which we switch from walking to running as we speed up (or vice-versa, of course, as we slow down). As we might imagine, space suits modify the velocity of the walk-run transition. As you may or may not know, this is significant, since a suited individual operating under reduced gravity uses less energy to run rather than walk the same distance, possibly due to "spring" effects of running in a pressurized suit versus the hard work of slogging slowly forward in the same suit.
Carr and McGee modify the usual walk-run transition formula to include an "Apollo" number that factors in the percentage of human-supported to total transported mass. This is significant since a pressurized suit in a vacuum is self-supporting - if you filled a space suit and carefully set it up outside on the moon, it would stand on its own. While this does impart the rigidity that makes walking in a suit so hard, it also means the wearer isn't working to hold the suit's weight up, which in turn modifies the velocity of the walk-run transition.
The practical impact of this is that we now have a formula that is better adjusted to predicting in advance (and presumably manipulating) the walk-run transition velocity for suited individuals...and, as the authors note, "suited" in this sense includes both astronauts in spacesuits and exoskeletons operating on Earth.
So one step closer to Cyclones for all of us.