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- Title
Effects of Standing, Upright Seated, vs. Reclined Seated Postures on Astronaut Injury Biomechanics for Lunar Landings.
- Authors
Lalwala, Mitesh; Koya, Bharath; Devane, Karan S.; Hsu, Fang-Chi; Yates, Keegan M.; Newby, Nathaniel J.; Somers, Jeffrey T.; Gayzik, F. Scott; Stitzel, Joel D.; Weaver, Ashley A.
- Abstract
Astronauts may pilot a future lunar lander in a standing or upright/reclined seated posture. This study compared kinematics and injury risk for the upright/reclined (30°; 60°) seated vs. standing postures for lunar launch/landing using human body modeling across 30 simulations. While head metrics for standing and upright seated postures were comparable to 30 cm height jumps, those of reclined postures were closer to 60 cm height jumps. Head linear acceleration for 60° reclined posture in the 5 g/10 ms pulse exceeded NASA's tolerance (10.1 g; tolerance: 10 g). Lower extremity metrics exceeding NASA's tolerance in the standing posture (revised tibia index: 0.36–0.53; tolerance: 0.43) were lowered in seated postures (0.00–0.04). Head displacement was higher in standing vs. seated (9.0 cm vs. 2.4 cm forward, 7.0 cm vs. 1.3 cm backward, 2.1 cm vs. 1.2 cm upward, 7.3 cm vs. 0.8 cm downward, 2.4 cm vs. 3.2 cm lateral). Higher arm movement was seen with seated vs. standing (40 cm vs. 25 cm forward, 60 cm vs. 15 cm upward, 30 cm vs. 20 cm downward). Pulse-nature contributed more than 40% to the injury metrics for seated postures compared to 80% in the standing posture. Seat recline angle contributed about 22% to the injury metrics in the seated posture. This study established a computational methodology to simulate the different postures of an astronaut for lunar landings and generated baseline injury risk and body kinematics data.
- Subjects
POSTURE; LINEAR acceleration; BIOMECHANICS; ASTRONAUTS; HUMAN body
- Publication
Annals of Biomedical Engineering, 2023, Vol 51, Issue 5, p951
- ISSN
0090-6964
- Publication type
Article
- DOI
10.1007/s10439-022-03108-7