Reactive Strength Index (RSI)
RSI = Jump Height / Ground Contact Time
The reactive strength index measures the reactive jump capacity of the athletes and is obtained by completing a drop jump.
The athlete must first start at ground level and step up onto a block or box prior to stepping off and immediately rebounding back off the floor, with the intent to jump as quickly and high as possible.
Note: If the start position is NOT set at floor level then RSI will not calculate
Yes - you can use GymAware with a depth jump to access RSI.
The RSI metric is only available at the GymAware Cloud level analysis - so it's not available directly on the iPad.
The easiest way to perform the test is to use a broomstick across the shoulders - attach the strap to one side.
Position the GA PowerTool at the landing zone - but to one side - see below sketch of top down view.
On the iPad it may register the step up onto the box as a rep along with the jump that is performed. However once the data is synchronised to the GymAware Cloud it will have the first (non jump rep) automatically removed.
Best protocol is to use AUTO REC - if you start the REC on the iPad when the athlete is "standing tall" in the landing zone this will set the starting position point.
Then ask then to step up and drop off and rebound jump as quickly as possible.
You may even get the athlete to face out from the box and then ask then to step behind and up onto the box prior to stepping off that same side in a forward facing position as they do the drop jump.
Lastly here is a link to the most common setup/exercises used with GymAware - however we didn't do a specific on for the box jump: