BW | Body weight |
G | Gravity |
GRF | Ground reaction force |
HR | Heart rate |
LBNP | Lower body negative pressure |
γ | The angle between the horizontal and the ground pivot on the right side of the mechanism |
θ | Input position |
θ̇ | Velocity |
θ̈ | Acceleration |
s | Position of the spring |
ṡ | Velocity of the spring |
I* | Equivalent inertia of the system |
I | mass of inertia |
m | mass |
Fspring | Resistance provided by the spring |
Fuser | Resistive force |
lo | Link length of the member between the horizontal and the ground pivot on the right side of the mechanism |
l1 | Link length of the member between lo and the rotational pivot |
l2 | Link length of the member below the rotational pivot |
l3 | Link length of the member above the rotational pivot |
ΔP | Pressure differential force- the difference between the pressures inside the Box vs. outside the Box |
Axy | Cross sectional area of the seal which is placed around the subject’s waist |
β | The angle between vector Fuser and the arm l3 |