ForceFrame measures force applied through the sensors, allowing you to capture key metrics during your testing.
The following metrics are available to you in the post-testing results screen in ForceFrame iOS.
| Metric | Unit | Description |
| Peak force | N |
The maximum force produced during a test. Higher values are generally preferred |
| Strength ratio | - | A comparison of opposing muscle groups (e.g. quadriceps vs hamstrings). This will appear if you have chosen a dual movement test such as Hip Ad/Ab or Shoulder IR/ER. |
| Peak force / BM | N/kg or N/lb |
Peak force relative to body mass, showing how much force is produced per kilogram or pound. Higher values are generally preferred |
| Peak RFD | N/s |
The steepest rise in force over time, showing how quickly force is produced. Higher values are generally preferred |
| Min time to peak force | s |
The time it takes to reach peak force from the start of the effort. Lower values are generally preferred |
Additional metrics
The following metrics are also available to view in VALD Hub.
| Metric | Unit | Description |
| RFD at 50ms | N/s |
The highest rate of force development achieved within the first 50/100/150/200/250 milliseconds after the start of the effort. RFD represents the slope of the force-time curve. A steeper slope means faster force production. |
| RFD at 100ms | ||
| RFD at 150ms | ||
| RFD at 200ms | ||
| RFD at 250ms | ||
| Impulse at 50ms | N s |
The highest impulse achieved within the first 50/100/150/200/250 milliseconds after the start of the effort. Impulse is a measure of force over time, representing the area under the force-time curve. A steeper slope (higher force) over a fixed time means greater impulse. |
| Impulse at 100ms | ||
| Impulse at 150ms | ||
| Impulse at 200ms | ||
| Impulse at 250ms |
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