ShoeSense breaks down the key running metrics into two categories:
Running Health: Impact Force, Ground Contact, and Pronation Rate.
Running Performance: Cadence, Braking Force and Propulsion.
The iOS App and each metric is explained in more depth below and is based on scientific research done in biomechanics labs and real world testing.
ShoeSense iOS App Demo
Impact Force (Health)
Impact force is measured in G force and measures the force that the body experiences during the run. When running the body feels upwards of 7-8 times their body weight every step. Once this force becomes excessive over a short period of time it can cause injury.
Braking Force (Performance)
Braking force is measured in G force and measures the average force opposing the bodies forward motion. During heel to toe running there is a component of the force that is slowing the runner down. The goal is to get the braking force down by not over-striding and landing with the foot underneath your hips.
Ground Contact Time (Health)
Ground Contact time is the amount of time that your foot is on the ground during running. Typically 150 ms for fast running, 250 ms for medium running and 350 ms for slow running. A lower ground contact time means you are spending less time not moving with your foot on the ground and more time in the air propelling yourself forward.
Cadence is the number of steps that a runner takes per minute. Cadence normally ranges from 150 steps per minute (spm) to 210 spm. Higher cadence is often associated with faster running and less over-striding. The Optimal Cadence line on the graph is measured according to your own cadence and with a goal of 180 spm. It will increase by 10% each week to help you increase your cadence a little bit at a time with a goal of getting as close to 180 as possible.
Pronation Rate (Health)
Pronation rate is how fast your foot rotates internally during the foot-strike. There is currently no evidence that "over-pronation" during running can be associated with the development of running injuries. The goal is to make sure the rate of rotation of the foot stays within your preferred movement path that is baselined on the first runs using the device.
Propulsion is the rate of rotation of your ankle through the foot-strike. It is measured in degrees per second and helps to quantify how fast your foot moves from initial foot-strike to toe off. It can be as high as 2000 deg/sec and is tied to the foot-strike, shoe and speed at which you are running.