Free Fall Acrobatics to Reduce Neck Loads During Parachute Opening Shock: Evaluation of an Intervention. (ACROPOSE)
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|ClinicalTrials.gov Identifier: NCT02625896|
Recruitment Status : Completed
First Posted : December 9, 2015
Last Update Posted : October 30, 2018
|Condition or disease||Intervention/treatment||Phase|
|Pain Athletic Injuries Whiplash Injuries Biomechanical Lesion, Unspecified||Behavioral: Intervention||Not Applicable|
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||16 participants|
|Intervention Model:||Crossover Assignment|
|Masking:||None (Open Label)|
|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|
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.
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.
- 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.
- Magnitudes of jerks [ Time Frame: 10 seconds ]Multidirectional rates of changes of accelerations during ram-air parachute openings expressed in G per second.
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 ClinicalTrials.gov identifier (NCT number): NCT02625896
|Stockholm, Sweden, 14183|
|Principal Investigator:||Anton Westman, MD PhD||Karolinska Institutet|