Free Fall Acrobatics to Reduce Neck Loads During Parachute Opening Shock: Evaluation of an Intervention.
ACROPOSE
2 other identifiers
interventional
16
1 country
1
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.
Trial Health
Trial Health Score
Automated assessment based on enrollment pace, timeline, and geographic reach
participants targeted
Target at below P25 for not_applicable pain
Started Jun 2017
Typical duration for not_applicable pain
1 active site
Health score is calculated from publicly available data and should be used for screening purposes only.
Trial Relationships
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Study Timeline
Key milestones and dates
First Submitted
Initial submission to the registry
December 7, 2015
CompletedFirst Posted
Study publicly available on registry
December 9, 2015
CompletedStudy Start
First participant enrolled
June 17, 2017
CompletedPrimary Completion
Last participant's last visit for primary outcome
October 14, 2018
CompletedStudy Completion
Last participant's last visit for all outcomes
October 14, 2018
CompletedOctober 30, 2018
October 1, 2018
1.3 years
December 7, 2015
October 27, 2018
Conditions
Keywords
Outcome Measures
Primary Outcomes (2)
Magnitudes of decelerations
Multidirectional accelerations during ram-air parachute openings expressed in terms of multiples of Earth's gravitational acceleration g using the dimensionless ratio G.
10 seconds
Magnitudes of jerks
Multidirectional rates of changes of accelerations during ram-air parachute openings expressed in G per second.
10 seconds
Study Arms (2)
Intervention
EXPERIMENTALA 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.
Control
NO INTERVENTIONNormal main parachute extraction performed in a manner that is typical for the study participant.
Interventions
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.
Eligibility Criteria
You may qualify if:
- Holders of the highest parachute certification (level D) in the Swedish Parachute Association
You may not qualify if:
- Ongoing neck problems
- Pregnancy
- Unwillingness to follow the safety regulations of the study
- Known patch allergy
- Participation in another concurrent biomedical study
Contact the study team to confirm eligibility.
Sponsors & Collaborators
Study Sites (1)
Karolinska Institutet
Stockholm, 14183, Sweden
Related Publications (6)
Westman A, Bjornstig U. Injuries in Swedish skydiving. Br J Sports Med. 2007 Jun;41(6):356-64; discussion 364. doi: 10.1136/bjsm.2006.031682. Epub 2007 Jan 15.
PMID: 17224436BACKGROUNDWestman A, Sjoling M, Lindberg A, Bjornstig U. The SKYNET data: demography and injury reporting in Swedish skydiving. Accid Anal Prev. 2010 Mar;42(2):778-83. doi: 10.1016/j.aap.2009.11.013. Epub 2009 Dec 31.
PMID: 20159107BACKGROUNDNilsson J, Friden C, Buren V, Westman A, Lindholm P, Ang BO. Musculoskeletal pain and related risks in skydivers: a population-based survey. Aviat Space Environ Med. 2013 Oct;84(10):1034-40. doi: 10.3357/asem.3570.2013.
PMID: 24261055BACKGROUNDGladh K, Ang BO, Lindholm P, Nilsson J, Westman A. Decelerations and muscle responses during parachute opening shock. Aviat Space Environ Med. 2013 Nov;84(11):1205-10. doi: 10.3357/asem.3637.2013.
PMID: 24279237BACKGROUNDLo Martire R, Gladh K, Westman A, Lindholm P, Nilsson J, Ang BO. Neck muscle activity in skydivers during parachute opening shock. Scand J Med Sci Sports. 2016 Mar;26(3):307-16. doi: 10.1111/sms.12428. Epub 2015 Mar 10.
PMID: 25754941BACKGROUNDWestman A, Ang BO. Free Fall Acrobatics to Reduce Neck Loads During Parachute Opening Shock: Evaluation of an Intervention (ACROPOSE). BMJ Open Sport Exerc Med. 2016 Apr 26;2(1):e000108. doi: 10.1136/bmjsem-2015-000108. eCollection 2016.
PMID: 27900175DERIVED
MeSH Terms
Conditions
Interventions
Condition Hierarchy (Ancestors)
Intervention Hierarchy (Ancestors)
Study Officials
- PRINCIPAL INVESTIGATOR
Anton Westman, MD PhD
Karolinska Institutet
Study Design
- Study Type
- interventional
- Phase
- not applicable
- Allocation
- RANDOMIZED
- Masking
- NONE
- Purpose
- PREVENTION
- Intervention Model
- CROSSOVER
- Sponsor Type
- OTHER
- Responsible Party
- PRINCIPAL INVESTIGATOR
- PI Title
- MD PhD
Study Record Dates
First Submitted
December 7, 2015
First Posted
December 9, 2015
Study Start
June 17, 2017
Primary Completion
October 14, 2018
Study Completion
October 14, 2018
Last Updated
October 30, 2018
Record last verified: 2018-10