Single Leg Hop Firm Surface, Single Leg Hop Grass Surface, Single Leg Hop Sand Surface
Conditions
Keywords
Sand, knee valgus, knee abduction moment, electromyography
Brief summary
This study evaluates the effect of different surfaces on the load experienced by the knee when landing from a single leg hop. A sand, pliable grass and firm (hard floor) surface will be compared when hopping from a 30 cm height. Each subject will complete 5 hops on each surface in a random order. The muscle activity in selected muscles of the lower limb will also be investigated to see how this differs in the landing leg, when landing on the different surfaces.
Detailed description
The aim of this study is twofold: 1) To investigate the effect of sand on landing kinematics and kinetics at the knee joint when performing a single leg jump landing task (dominant leg), comparing sand with a firm surface and pliable grass control. 2) To investigate the sEMG activity of the hamstring, quadriceps and gastrocnemius muscles of the dominant leg during the jump landing task on these different surfaces (from take off through to terminal knee flexion at the end of the landing phase).
Interventions
OTHERfirm ground
firm surface
OTHERSand
sand surface
OTHERartificial grass
grass surface
Sponsors
Teesside University
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
TREATMENT
Masking
NONE
Intervention model description
Randomised, repeated measures crossover design.
Eligibility
Sex/Gender
FEMALE
Age
16 Years to 45 Years
Healthy volunteers
Yes
Inclusion criteria
* Female * Participate in a minimum of 3 hours sporting activity per week. * Provided Informed Consent * Must be over 16 years of age (16-45 years) * No
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| knee abduction moment (N.m) | 1 testing session (1 day) | a combination of ground force and amount of knee valgus on landing |
| knee valgus | 1 testing session (1 day) | angle at the knee on landing |
| surface electromyography (sEMG) activity pre and post landing | 1 testing session (1 day) | muscle activity of quadriceps (vastus medialis, vastus lateralis), hamstrings (lateral and medial), gastroc (lateral head) |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Anterior tibial translation | 1 testing session(1 day) | The amount of forward translation of the tibia when landing on the surface |
Countries
United Kingdom
Outcome results
None listed