Landmarks and Phases of a Drop Jump

The key landmarks of a Drop Jump are:

Landmark Description
Drop Landing Point where a 20N threshold is exceeded.
Peak Impact Force Greatest passive force on impact from box drop.
Contact Trough Lowest force point between peak impact and peak drive-off force.
Start of Concentric Rising from the lowest position after landing.
Peak Drive-Off Force Peak active force (contraction based).
Take-off Point of toe off/beginning of flight time.
Landing Point of touch down (Force over 20N).
Peak Landing Force Greatest force generated on landing.

The key phases of a Drop Jump are:

Phase Description
Eccentric Phase From drop landing until zero velocity.
Concentric Phase Zero velocity until take-off.
Flight Phase From take-off until landing.
Landing Phase Point where force rises above 30N and settles back to bodyweight.