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Free Fall Acrobatics to Reduce Neck Loads During Parachute Opening Shock: Evaluation of an Intervention. (ACROPOSE)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02625896
Recruitment Status : Completed
First Posted : December 9, 2015
Last Update Posted : October 30, 2018
Information provided by (Responsible Party):
Anton Westman, Karolinska Institutet

Brief Summary:
This study aims to evaluate the use of an aerial human body manoeuvre to reduce the biomechanical load on the neck of a parachutist during the parachute opening, in order to create a basis for future prevention of skydiver neck pain in the parachutist population.

Condition or disease Intervention/treatment Phase
Pain Athletic Injuries Whiplash Injuries Biomechanical Lesion, Unspecified Behavioral: Intervention Not Applicable

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 16 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)
Primary Purpose: Prevention
Official Title: Free Fall Acrobatics to Reduce Neck Loads During Parachute Opening Shock: Evaluation of an Intervention.
Actual Study Start Date : June 17, 2017
Actual Primary Completion Date : October 14, 2018
Actual Study Completion Date : October 14, 2018

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Falls Shock

Arm Intervention/treatment
Experimental: Intervention
A sequence of free fall manoeuvres performed using the human body: A free fall velocity reduction prior to main parachute deployment followed by a head high body attitude prior to main parachute extraction.
Behavioral: Intervention
Standard skydive from 4 000 m above mean sea level (AMSL) following standard safety recommendations and procedures including, if necessary, standard reserve parachute activation procedures. If necessary for safety, participants are asked to immediately leave the study at will. At 1 500 m AMSL, the participant is asked to begin to slow down the fall rate by increasing the body surface area to the relative wind. At no lower than 1 200 m AMSL, the participant is asked to deploy the main parachute. At main parachute deployment, while maintaining a stable body position with shoulders level to the horizon and unaltered heading, the participant is asked to increase the pitch angle of the long body axis attitude, raising the head, shoulders, and upper body up from the flat belly-to-relative-wind plane to a head-high body position, using any free fall technique the participant is comfortable with - as long as there is NO RISK for an unintentional backflip.

No Intervention: Control
Normal main parachute extraction performed in a manner that is typical for the study participant.

Primary Outcome Measures :
  1. Magnitudes of decelerations [ Time Frame: 10 seconds ]
    Multidirectional accelerations during ram-air parachute openings expressed in terms of multiples of Earth's gravitational acceleration g using the dimensionless ratio G.

  2. Magnitudes of jerks [ Time Frame: 10 seconds ]
    Multidirectional rates of changes of accelerations during ram-air parachute openings expressed in G per second.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Holders of the highest parachute certification (level D) in the Swedish Parachute Association

Exclusion Criteria:

  • Ongoing neck problems
  • Pregnancy
  • Unwillingness to follow the safety regulations of the study
  • Known patch allergy
  • Participation in another concurrent biomedical study

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02625896

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Karolinska Institutet
Stockholm, Sweden, 14183
Sponsors and Collaborators
Karolinska Institutet
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Principal Investigator: Anton Westman, MD PhD Karolinska Institutet
Additional Information:
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Anton Westman, MD PhD, Karolinska Institutet Identifier: NCT02625896    
Other Study ID Numbers: CIF FO2015-0005.
CIF D2014-0021 ( Other Identifier: The Swedish National Centre for Research in Sports (CIF) )
First Posted: December 9, 2015    Key Record Dates
Last Update Posted: October 30, 2018
Last Verified: October 2018

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Anton Westman, Karolinska Institutet:
Additional relevant MeSH terms:
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Wounds and Injuries
Whiplash Injuries
Athletic Injuries
Neck Injuries