Effect of Sand on Knee Load and Muscle Activity During a Single Leg Landing Task

Not Applicable

Completed

• Conditions: Single Leg Hop Sand Surface; Single Leg Hop Grass Surface; Single Leg Hop Firm Surface
• Interventions: Other: firm ground; Other: artificial grass; Other: Sand

• Registration Number: NCT04502615
• Lead Sponsor: Teesside University

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).

Study Timeline

• Study Start: 2020-03-03
• Study First Submitted: 2020-07-30
• Study First Submitted QC: 2020-08-04
• Study First Posted: 2020-08-06
• Primary Completion: 2021-12-10
• Study Completion: 2021-12-10
• Status Verified: 2022-04
• Last Update Submitted: 2022-04-26
• Last Update Posted: 2022-04-27

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Female
• Target Recruitment: 20

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 exclusion criteria

Exclusion Criteria

• Not willing to provide informed consent
• Pregnant
• History of ACL injury or other knee pathology
• Significant lower limb pathology
• Previous lower limb fracture or surgery
• Lower Limb injury in last 3 months.
• Male

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Firm Ground	firm ground	Participants perform 5 single leg hops onto a firm ground surface from a 30cm height
Artificial grass	artificial grass	Participants perform 5 single leg hops onto a grass surface from a 30cm height
Sand	Sand	Participants perform 5 single leg hops onto a Sand surface from a 30cm height

Primary Outcome Measures

Name	Time	Method
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 Outcome Measures

Name	Time	Method
Anterior tibial translation	1 testing session(1 day)	The amount of forward translation of the tibia when landing on the surface

Trial Locations

Locations (1)

Teesside University; 🇬🇧 Middlesbrough, United Kingdom