Landing Mechanics Differences between the Drop Vertical Jump and Stop Jump

A mechanics comparison between landing from a countermovement jump and landing from stepping off a box.

It is common practice to study jump landing mechanics by having subjects step off a box set at a certain height instead of landing from a jump. This practice assumes that the landing mechanics are similar between stepping off a box and a countermovement jump as long as the heights can be matched. The mechanics of the two methods had never been compared when landing from identical heights. Thus,...

Fatigue Alters Landing Shock Attenuation During a Single-Leg Vertical Drop Jump

BACKGROUND Landings in fatigue conditions are considered to be one of the factors that cause noncontact anterior cruciate ligament (ACL) injury. Additionally, it is known that fatigue alters lower extremity landing strategies and decreases the ability to attenuate shock during landing. PURPOSE To determine characteristics of knee kinematics and shock attenuation during the landing phase of a ...

Changes in Drop-Jump Landing Biomechanics During Prolonged Intermittent Exercise

BACKGROUND As injury rates rise in the later stages of sporting activities, a better understanding of lower extremity biomechanics in the later phases of gamelike situations may improve training and injury prevention programs. HYPOTHESIS Lower extremity biomechanics of a drop-jump task (extracted from a principal components analysis) would reveal factors associated with risk of anterior cruci...

Frontal plane comparison between drop jump and vertical jump: implications for the assessment of ACL risk of injury.

The potential to use the vertical jump (VJ) to assess both athletic performance and risk of anterior cruciate ligament (ACL) injury could have widespread clinical implications since VJ is broadly used in high school, university, and professional sport settings. Although drop jump (DJ) and VJ observationally exhibit similar lower extremity mechanics, the extent to which VJ can also be used as sc...

Maturation Leads to Gender Differences in Landing Force and Vertical Jump Performance