Abstract
Half-squat parachuting landing is a kind of activity with high impact force. Injuries on lower-extremity joints are common in half-squat parachuting landing and would be increased with a backpack. An ankle brace was used to prevent ankle injuries in landing. However, few quantitative studies reported about the protection of an ankle brace for lower-extremity joints in half-squat parachuting landing with a backpack. This study focused on evaluating the protective effects of an ankle brace in half-squat parachuting landing with a backpack. Seven male participants landed from 120 cm with a backpack and an ankle brace. Each participant performed three landing trials on every experimental condition. Kinetics and kinematics of the hip, knee, and ankle were analyzed. It was found that the ankle brace did not significantly affect the ground reaction force with backpack but increased the ground reaction force from 14.7 ± 2.0 bodyweight to 16.2 ± 1.9 bodyweight (p = 0.017) without the backpack. The ankle brace significantly (p < 0.05) decreased the angular displacement, angular velocity, and angular acceleration of the ankle both without and with the backpack. In conclusion, the ankle brace could restrict ankle motion and significantly increase ground reaction force without the backpack. However, the ankle brace did not significantly influence ground reaction force and still restricted ankle motion with the backpack. Therefore, the ankle brace was more effective in half-squat parachuting landing with the backpack than no-backpack landing.
Highlights
Parachuting landing, one kind of landing with high impact force, was common in military and civil activities
The purpose of this study was to evaluate the protective effects of an ankle brace on lower-extremity joints in half-squat parachuting landing with a backpack by analyzing kinetics and kinematics of the hip, knee, and ankle
The peak vertical ground reaction force was significantly increased from 14.7 ± 2.0 to 16.2 ± 1.9 BW (p 0.017) by the ankle brace in the landing without the backpack
Summary
Parachuting landing, one kind of landing with high impact force, was common in military and civil activities. Injuries, such as ankle fracture, ankle sprains, and hip contusions, occurred on lowerextremity joints (i.e., hip, knee, and ankle) due to the high impact force on the lower extremity (Ekeland, 1997; Knapik et al, 2011; Zakowski et al, 2019). Injuries on the lower-extremity joints were commonly seen in the half-squat parachuting landing (Li et al, 2013). This study would focus on decreasing injuries of the lower-extremity joints in the half-squat parachuting landing. It was reported that inversion ankle sprains were decreased by the ankle brace from 0.379% to 0.055%
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