The Effect of Gravity on the Muscular Control of Landing From a Jump

NCT02563223 | Unknown

• 1 other identifier: 11-118
• Study Type: interventional
• Target: 18
• Locations: 1 country
• Sites: 1

Brief Summary

In this project, investigators propose to study the jump in different reduced gravity fields obtained during parabolic flights profiles but also during increased gravity fields obtained during turns of the airplane or during the pull-up phase of the parabola. By means of a pneumatic device, an additional pull-down force will be added to the vertical force caused by the gravity field. By combining different levels of gravity to different levels of the added pull-down force it will be possible to dissociate the respective contribution of the otolithic and proprioceptive systems to the anticipatory landing response. To the investigators' knowledge, only one study has modified the gravity field during a jump. However, these authors did not add a pull-down force and only analyzed the vertical ground reaction force. A better knowledge of the sensory-motor control of the landing phase of a jump will also increase the investigators' understanding of the physiopathology of joint instability. Indeed, similarities could be found between the evolution of the motor response due to the absence gravity during long-duration space flights and the pathological process of chronic ankle and knee instability. The knowledge generated by this study will thus provide invaluable information in the context of human performance and rehabilitation.

Conditions

Healthy Volunteers

Outcome Measures

Primary Outcomes (1)

• Electromyography (Amplitude - mV and latency - ms)

  EMG (electrical activity produced my muscles when they contract) will be recorded with a MyoSystem 1400L using surface electrodes at the level of the lateral gastrocnemius, medial gastrocnemius, tibialis anterior and peroneus longus, and on the thigh at the level of the vastus lateralis, vastus medialis and lateral hamstrings and medial hamstrings. EMG activation (amplitude and latency) will be measured during jumps at different level of gravity and pull-down forces.

  baseline

Study Arms (1)

electromyographic (EMG) measurements

OTHER

Interaction between gravity (weightlessness, hypergravity, and normal gravity) and pull-down force ont EMG amplitude and EMG timing.

Other: Parabolic flight; Device: Subject Loading System

Interventions

Parabolic flight OTHER

electromyographic (EMG) measurements

Subject Loading System DEVICE

a device that combines a force platform on which the subject jumps and a Subject Loading System (SLS) that pulls the subject downwards.

electromyographic (EMG) measurements

Eligibility Criteria

• Age: 18 Years - 65 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Healthy volunteers (men or women)
• Aged from 18 to 65
• Affiliated to a Social Security system and, for non-French resident, holding a European Health Insurance Card (EHIC)
• Who accepted to take part in the study
• Who have given their written stated consent
• Who has passed a medical examination similar to a standard aviation medical examination for private pilot aptitude. There will be no additional test performed for subject selection

You may not qualify if:

• Pregnant women
• Person with medical history of musculoskeletal disorders of the lower limbs, pelvis or spine, neurological or vestibular disorders.

Sponsors & Collaborators

• University Hospital, Caen: lead

Study Sites (1)

Umr Ucbn/Inserm U1075 Comete

Caen, Basse-Normandie, 14032, France

RECRUITING

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: NA
• Masking: NONE
• Purpose: BASIC SCIENCE
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: July 23, 2015
• First Posted: September 30, 2015
• Study Start: November 1, 2011
• Primary Completion: October 1, 2015
• Last Updated: September 30, 2015

Record last verified: 2015-09

Locations

FR (1)