title: Does foot pitch at ground contact affect parachute landing technique?
abstract: The Australian Defence Force Parachute Training School instructs trainees to make initial ground contact using a flat foot whereas United States paratroopers are taught to contact the ground with the ball of the foot first. This study aimed to determine whether differences in foot pitch affected parachute landing technique. Kinematic, ground reaction force and electromyographic data were analyzed for 28 parachutists who performed parachute landings (vertical descent velocity = 3.4 m x s(-1)) from a monorail apparatus. Independent t-tests were used to determine significant (p < 0.05) differences between variables characterizing foot pitch. Subjects who landed flat-footed displayed less knee and ankle flexion, sustained higher peak ground reaction forces, and took less time to reach peak force than those who landed on the balls of their feet. Although forefoot landings lowered ground reaction forces compared to landing flat-footed, further research is required to confirm whether this is a safer parachute landing strategy.
authors.affiliation: Biomechanics Research Laboratory, School of Health Sciences, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia.
authors.forename: John W
authors.initials: JW
authors.lastname: Whitting
authors.forename: Julie R
authors.initials: JR
authors.lastname: Steele
authors.forename: Mark
authors.initials: M
authors.lastname: Jaffrey
authors.forename: Bridget J
authors.initials: BJ
authors.lastname: Munro
mesh_terms: D000328:Adult; D001315:Australia; D001359:Aviation; D001696:Biomechanical Phenomena; D004576:Electromyography; D005260:Female; D005528:Foot; D006801:Humans; D008297:Male; D008889:Military Personnel; D018482:Muscle, Skeletal; D010865:Pilot Projects; D011187:Posture; D012987:Soil
chemical_list: D012987:Soil