Below you can find a glossary of key terms that are commonly used by Runfisx for the purposes of running gait analysis. Across the full breadth of published literature different terms have been used to describe the same metric or process. The list presented here is the nomenclature we refer to at Runfisx as it closely matches the common terms in the technology we choose to use. 

 

Step

The action of transferring from one foot contact to the next foot contact on the opposing side.

Measuring both feet

 

Stride

The action of transferring from one foot contact to the next foot contact on the same side. 

Measuring only one side

 

Step Rate (spm)

The number foot contacts (steps) taken per minute counting both sides. 

Your turn over rate or cadence

 

Stride Length (m)

The distance between consecutive foot contacts of the same side. 

How far you are propelling yourself forward

 

Vertical Oscillation (cm)

The vertical distance of movement from the lowest point to the highest point of the center of mass of the body. 

How much you are moving up and down

 

Leg Spring Stiffness (kN/m)

The mechanical stiffness under load of the legs measured as a bulk value across both sides. 

How well your body turns the force returned from the ground into propulsion

 

Power (W)

The amount of work performed to move propel the body upward and forward over the ground per second. 

The amount of force you are producing and how quickly you are producing it

 

Flight Ratio (%)

The percentage of time spent in the air versus on the ground. 

How effective you are at staying off the ground and in the air

 

Ground Contact Time (ms)

The overall time the foot spends on the ground. 

How long you spend on the ground

 

Ground Reaction Force (N)

The peak vertical force returned to the body after application into the ground. 

How much force (strength) you are outputting

 

Impact (G)

The vertical component of the peak acceleration felt by the body. 

How abruptly you strike the ground

 

Braking (G)

The horizontal component of the peak acceleration felt by the body. 

How abruptly you strike the ground

 

Footstrike Type (#)

The nature of the initial footstrike measured numerically and then reported as fore-foot, mid-foot or heel. 

What part of the foot strikes the ground first

 

Pronation Excursion (o)

The maximum inward deviation angle of the foot-ankle area. 

How much your ankle rolls inward

 

Pronation Velocity (o/s)

The maximum rate of inward deviation of the foot-ankle area.

How fast your ankle rolls inward

 

Pelvic Drop (o)

The maximum deviation angle of lateral drop of the pelvis from the standing neutral position. 

How much your hip drops when the opposite foot is on the ground

 

Pelvic Rotation (o)

The maximum deviation angle of transverse rotation of the pelvis from the standing neutral position. 

How much your hips rotate inward as you swing your legs through

 

sEMG (μV)

A measure of the surface-depth electrical activity in a particular muscle or muscle group.

How active a particular muscle or muscle group is