Ankle dorsiflexion range of motion impacts sagittal-plane, but not frontal-plane landing mechanics

Cammack, Nicholas (2019) Ankle dorsiflexion range of motion impacts sagittal-plane, but not frontal-plane landing mechanics. Undergraduate dissertation, University of Cumbria. Item availability may be restricted.

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Poor landing mechanics has been highlighted as injury risk factor for the development of injuries. Deficits in ankle dorsiflexion range of motion (DF ROM) have been shown to lead to altered landing mechanics in the lower extremities. However, at present there is limited evidence for restrictions in ankle DF ROM influencing hip or trunk kinematics during landing tasks. Therefore, this study investigated the relationship between ankle DF ROM and the aberrant strategies in lower extremity and trunk kinematics during a single leg drop vertical jump (SLDVJ). Thirty-one participants volunteered for this investigation (12 women and 19 men, mean ± SD; age 21 ± 1.7 years, height 173.1 ± 8.2 cm, mass 72.3 ± 13.7). Ankle DF ROM was measured for the right limb using the weight bearing lunge test (WBLT). The SLDVJ was performed off a 10 cm box on the right limb for three repetitions. Sagittal-plane initial contact, peak flexion and joint displacement angles were calculated for the hip, knee and ankle joints. Frontal-plane projection angles for the knee and lateral trunk motion angle were also calculated at the moment of peak knee flexion. A significant negative relationship was found between ankle DF ROM and peak flexion at the knee (R = -0.53, P<0.002) and ankle (R = -0.49, P<0.006) joints. No relationship was found between ankle DF ROM and other measures of landing performance. Previously, reduced peak knee flexion during landings has been associated with greater peak forces and loads placed on passive structures at the tibiofemoral joint. Limitations in ankle DF ROM may therefore increase the forces an individual is exposed to during single-leg landing activities, thus increasing an individual’s risk factor for injury.

Item Type: Thesis/Dissertation (Undergraduate)
Departments: Sports and Physical Activity
Additional Information: Submitted in partial fulfilment for the degree of BSc. (Hons) in Sport Rehabilitation at the University of Cumbria, UK, April 2019.
Depositing User: Anna Lupton
Date Deposited: 13 Jun 2019 10:52
Last Modified: 13 Jun 2019 10:52

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