Single Leg Hop Sand SurfaceNCT04502615
Effect of Sand on Knee Load and Muscle Activity During a Single Leg Landing Task
A study testing Sand, artificial grass and firm ground in people with Single Leg Hop Sand Surface and Single Leg Hop Grass Surface, run by Teesside University at 1 site in United Kingdom.
Trial 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. Read more about this study
- Who is it for?
- Ages 16 to 45 years, women onlyHealthy volunteers can take part
- Conditions the study is for
- Single Leg Hop Sand Surface, Single Leg Hop Grass Surface, Single Leg Hop Firm Surface
- What is being tested?
- Sand, artificial grass and firm ground
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 20 participants
- Where
- 1 siteUnited Kingdom
- Study dates
- 3 Mar 2020to 10 Dec 2021
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 16 to 45 years
- Women only
- Healthy volunteers accepted
- Child, Adult
Who may be able to join
- 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
Who cannot join
- 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
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Effect of Sand on Knee Load and sEMG Activity During a Single Leg Landing Task: Implications for ACL Prevention and Rehabilitation
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.
Read the 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).
- Being tested
- Sand, artificial grass, firm ground
- Keywords
- Sand, knee valgus, knee abduction moment, electromyography
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
SandOther
sand surface
artificial grassOther
grass surface
firm groundOther
firm surface
| Study group | Role | What they receive |
|---|---|---|
| Sand | Experimental | Participants perform 5 single leg hops onto a Sand surface from a 30cm height Receives: Other: Sand |
| Artificial grass | Active comparator | Participants perform 5 single leg hops onto a grass surface from a 30cm height Receives: Other: artificial grass |
| Firm Ground | Active comparator | Participants perform 5 single leg hops onto a firm ground surface from a 30cm height Receives: Other: firm ground |
What is being measured
The primary outcome is the main question the study is designed to answer.
knee abduction moment (N.m)
a combination of ground force and amount of knee valgus on landing
Measured: 1 testing session (1 day)
knee valgus
angle at the knee on landing
Measured: 1 testing session (1 day)
surface electromyography (sEMG) activity pre and post landing
muscle activity of quadriceps (vastus medialis, vastus lateralis), hamstrings (lateral and medial), gastroc (lateral head)
Measured: 1 testing session (1 day)
Secondary outcomes (1)
Anterior tibial translation
The amount of forward translation of the tibia when landing on the surface
Measured: 1 testing session(1 day)
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted6 Aug 2020
- Study start3 Mar 2020
- Primary completion10 Dec 2021
- Study completion10 Dec 2021
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Single Leg Hop Sand SurfaceStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Crossover
- Model description
- Randomised, repeated measures crossover design.
- Masking
- None (open label)
- Enrolment
- 20 participants (actual)
Sponsor and investigators
- Lead sponsor
- Teesside University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Mark Richardson, Teesside University
- Investigators
- Mark Richardson, MSc, Principal investigator, Teesside University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04502615
- Sponsor's protocol ID
- TeessideUni
- Status last verified
- Apr 2022
- First submitted
- 30 Jul 2020
- Last updated
- 27 Apr 2022
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Richardson MC, Evans W, Chesterton P, Wright M. The effects of a 6-week sand- vs. Land-based jump training programme on frontal plane knee angle and jump performance in adolescent female football players. J Sports Sci. 2025 Mar;43(6):523-535. doi: 10.1080/02640414.2025.2465946. Epub 2025 Feb 18.
PubMed 39964088
Study at a glance
From the registry record, last updated by the sponsor on 27 Apr 2022. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effect of Sand on Knee Load and sEMG Activity During a Single Leg Landing Task: Implications for ACL Prevention and Rehabilitation
- ClinicalTrials.gov ID
- NCT04502615
- Acronym / sponsor ID
- TeessideUni
- Keywords
- Sand, knee valgus, knee abduction moment, electromyography
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 20 participants (actual)
- Lead sponsor
- Teesside UniversityUniversity, hospital or other
- Study start
- 3 Mar 2020 (actual)
- Primary completion
- 10 Dec 2021 (actual)
- Study completion
- 10 Dec 2021 (actual)
- First posted
- 6 Aug 2020 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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 design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- None (open label)
- Number of arms
- 3
- Model description
- Randomised, repeated measures crossover design.
| Arm | Type | Receives |
|---|---|---|
| Sand | Experimental | Other: SandParticipants perform 5 single leg hops onto a Sand surface from a 30cm height |
| Artificial grass | Active comparator | Other: artificial grassParticipants perform 5 single leg hops onto a grass surface from a 30cm height |
| Firm Ground | Active comparator | Other: firm groundParticipants perform 5 single leg hops onto a firm ground surface from a 30cm height |
Who may qualify
- Ages
- 16 to 45 years
- Sex
- Female only
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult
Key inclusion criteria (5 listed)
- 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
Key exclusion criteria (7 listed)
- 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
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Sandsand surface | Other | Sand |
| artificial grassgrass surface | Other | Artificial grass |
| firm groundfirm surface | Other | Firm Ground |
Primary outcome
knee abduction moment (N.m)
Time frame: 1 testing session (1 day)
a combination of ground force and amount of knee valgus on landing
knee valgus
Time frame: 1 testing session (1 day)
angle at the knee on landing
surface electromyography (sEMG) activity pre and post landing
Time frame: 1 testing session (1 day)
muscle activity of quadriceps (vastus medialis, vastus lateralis), hamstrings (lateral and medial), gastroc (lateral head)
1 secondary outcome
Anterior tibial translation
Time frame: 1 testing session(1 day)
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 27 Apr 2022.
- Derived from this study: PubMed 39964088Richardson MC, Evans W, Chesterton P, Wright M. The effects of a 6-week sand- vs. Land-based jump training programme on frontal plane knee angle and jump performance in adolescent female football players. J Sports Sci. 2025 Mar;43(6):523-535. doi: 10.1080/02640414.2025.2465946. Epub 2025 Feb 18.
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Mark Richardson, MSc principal investigator
Teesside University
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Sand, artificial grass and firm ground in people with Single Leg Hop Sand Surface and Single Leg Hop Grass Surface, run by Teesside University at 1 site in United Kingdom.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 5 inclusion and 7 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 27 Apr 2022. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United Kingdom. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
knee abduction moment (N.m) (time frame: 1 testing session (1 day)). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT04502615, which also lists 1 linked publication.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 27 Apr 2022.