Evaluation of Optimal Gravity Center Position of Backpack in Half-Squat Parachuting Landing
10.16156/j.1004-7220.2021.06.18
- VernacularTitle:半蹲式跳伞着陆时最佳负重重心位置评估
- Author:
Tianyun JIANG
1
;
Shan TIAN
1
;
Tianhong CHEN
1
;
Chenyu LUO
1
;
Xingyu FAN
2
;
Jie YAO
1
;
Lizhen WANG
1
Author Information
1. Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University
2. College of Bioengineering, Chongqing University
- Publication Type:Journal Article
- Keywords:
backpack gravity center position;
lower extremity;
biomechanics;
parachuting landing
- From:
Journal of Medical Biomechanics
2021;36(6):E945-E950
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study effects of backpack gravity center position on kinetics and kinematics of lower-extremity joints in parachuting landing and evaluate the injuries. Methods Seven participants performed parachuting landing with backpack gravity center on three positions: low-back (position 1), upper-back (position 2) and abdomen (position 3). Results The peak vertical ground reaction force (GRF) with backpack on position 2 was significantly lower than that on position 1. The joint moment on sagittal plane of the hip with backpack on position 2 was significantly higher than that on position 1 and position 3. The joint energy absorption of the hip with backpack on position 2 was significantly higher than that on position 1. The angular displacement of the hip on sagittal plane with backpack on position 2 was significantly higher than that on position 1 and was significantly lower than that on position 3. The angular velocity of the hip on sagittal plane with backpack on position 2 was significantly lower than that on position 3. Conclusions Different positions of backpack gravity center could significantly influence kinetic and kinematic parameters of the hip. Backpack gravity center on upper-back position could decrease the lower-extremity injuries. The results can provide evidences for evaluating backpack gravity center and decreasing injuries in parachuting landing.
