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Dropjump RSI measuring   Reactive Stength Index (RSI)
testing sport-specific
leg left/right (a)symmetry 		 
Graphic result DropJump with the Reactive Strength Index

Reactivity Strength
An important component of the physical
requirements is the reactive strength.

Reactive strength can be defined as the ability
to change quickly from an eccentric to a
concentric contraction. (Young,1995)
Stretch Shorten Cycle (SSC)

The RSIndex is a suitable way of registering the
extent of explosivity. Just as with single jumps
this registration is also possible in the
Topjump-system master with multiple jumps (rep jumps),
the measurements shows the leg symmetry left/right

     The Reactive Strength Index (RSI) is one component of the Strength Qualities Assessment Test.
    SQAT is used at the Australian Institute of Sport (Young, 1995)
    Using the  Topjump-system with (ply)jump protocol the RSI is a calculated figure derived
    by dividing the height jumped by the time in contact prior to take-off (height jumped/time).