The Pact system uses data collected from the Pact Sense to calculate your Muscle Stiffness Score. Similar to a physical therapist gathering a subjective feeling of your muscles, the Pact system goes a step further, providing objective numbers that can be used to track muscle stiffness over time
This white paper details how the Pact Sense muscle scanner functions, the technical aspects of what the device is measuring, and the underlying technology that powers the device. Additionally, several research studies verifying the device performance are covered, illustrating applications of the Pact Sense
This white paper details how Impact Biosystems uses System Identification techniques to measure the mechanical properties of the muscle. With these techniques, Impact can quantify palpation of the muscles and providing meaningful insights to physical therapists and trainers
There are four parameters that the Pact system uses to characterize the mechanical state of muscle - stiffness, damping, stiffness slope, and damping slope. With these four parameters, Pact can quantify the state of any superficial muscle and the soft tissues around it.
Muscle stiffness is an objective indication of the state of your muscles. A higher Muscle Stiffness Score indicates that your muscles are properly prepared to engage in athletic activity, or adequately cooled down after your exercise. A low Muscle Stiffness Score indicates that you are not ready to perform.
The measurements taken by the Pact Sense are based on an engineering discipline known as “System Identification”.
Just like you can feel knots in your muscles, Pact Sense “feels” your muscles by applying a special force pattern, and measuring how they react. Mechanical properties of your muscles are then calculated from the data, which serve as the basis for your Muscle Stiffness Score.
Stiffness is one muscle property that you are probably familiar with. When evaluating stiffness, you can think of your muscles as a spring. The stiffer the spring, the more it will push back as it is compressed.
After a vigorous exercise, your muscles will feel “tight”. This is because your muscles’ stiffness increases as they become more fatigued.
If you shake your arms or legs in the right way, your muscles bounce back and forth. Damping is a measurement of how quickly your muscles stop moving after the shaking stops.
A small amount of damping means that your muscles will continue to jiggle once you stop shaking, while a lot of damping will result in your muscles quickly coming to a stop.
Similar to stiffness, the amount of damping in your muscles will change as you warm up, perform, and cooldown from your exercise.