Key Moments and Phases of a Countermovement Jump

The key moments of a Countermovement Jump are:

Key Moment	Description
Start of movement	Point where a 20N threshold is exceeded. Also start of eccentric phase / unloading sub-phase.
Start of braking phase	Point of minimum eccentric force. Also start of yielding sub-phase.
Start of deceleration	Point of eccentric peak velocity (EPV).
Start of concentric phase	Point of zero velocity.
Start of max RFD	Point of steepest concentric force.
End of max RFD	Poing of peak take-off force.
Peak take-off force	Highest force value obtained during the jump (eccentric/concentric phase).
Take-off	Point where force is below 30N.
Landing	Point where force rises above 30N.
Peak landing force	Highest force obtained during landing phase.

The key phases of a Countermovement Jump are:

Phase	Description
Quiet phase	Steady phase establishing clear standing baseline.
Eccentric phase	Phase from start of movement to zero velocity.
→ Unloading phase	Sub-phase of eccentric phase, also called 'unweighting': start of movement until minimum force.
→ Braking phase	Sub-phase of eccentric phase: minimum force until end of eccentric phase (zero velocity).
→ Yielding phase	Sub-phase within eccentric braking phase: minimum force until start of deceleration (point of peak eccentric velocity).
→ Deceleration phase	Sub-phase within eccentric braking phase: peak eccentric velocity until end of eccentric phase (zero velocity).
Concentric phase	Phase from zero velocity until take-off.
Flight phase	From take-off until landing.
Landing phase	Point where force rises above 30N, then eventually returns to bodyweight.

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