Introduction: The primary objective of this pilot study was to characterize human performance degradations caused by the pressurized Extravehicular Mobility Unit Spacesuit (EMU). Method: This study assessed maximum strength (force) for elbow flexion/extension and shoulder abduction/adduction for three EMU suit conditions. Results: Statistically significant differences were observed between suit conditions during elbow flexion. Differences of practical significant were observed between suit conditions for mean peak elbow flexion and extension, but not for shoulder abduction/adduction. EMU resistance to movement was found to differ based on the direction of movement. Discussion: Characteristics of the EMU spacesuit may reduce performance for some movements and improve performance for others.
References
1.
AndersonA.DiazA.KracikM.TrottiG.HoffmanJ.NewmanD. (2012, July15-19). Developing a Spacesuit Injury Countermeasure System for Extravehicular Activity: Modeling and Analysis. Paper presented at the 42nd International Conference on Environmental Systems, San Diego, CA.
2.
CharvatJ. M.NorcrossJ.ReidC. R.McFarlandS. M. (2015). Spacesuit Glove-Induced Hand Trauma and Analysis of Potentially Related Risk VariablesInternational Conference on Environmental Systems. Bellevue, WA (In Review).
3.
CheungS. S. (2010). Advanced Environmental Exercise Physiology. Champaign, IL: Human Kinetics.
4.
CowellS. A.StocksJ. M.EvansD. G.SimonsonS. R.GreenleafJ. E. (2002). The exercise and environmental physiology of extravehicular activity. Aviation, Space, and Environmental Medicine, 73(1), 54-67.
5.
GonzalezL. J.MaidaJ. C.MilesE. H.RajuluS. L.PandyaA. K. (2002). Work and Fatigue Characteristics of Unsuited and Suited Humans During Isolated Isokinetic Joint Motions. Ergonomics, 45(7), 484-500.
6.
MeyenF.HolschuhB.KobrickR.JacobsS.NewmanD. (2011). Robotic joint torque testing: a critical tool in the development of pressure suit mobility elements. AIAA, 5105, 17-21.
7.
MorganD. A.WilmingtonR. P.PandyaA. K.MaidaJ. C.DemelK. J. (1996). Comparison of extravehicular mobility unit (EMU) suited and unsuited isolated joint strength measurements. (NASA Technical Paper 3613). National Aeronautics and Space Administration.
8.
OppermanR.WaldieJ.NewmanD. (2009). EVA Injury, Comfort, and Protection: Improving the Plight of the Hand and Shoulder for the Constellation Program. Paper presented at the International Conference on Environmental Systems. San Francisco, CA: AIAA.
9.
ReidC.HarvillL.EnglandS.YoungK.NorcrossJ.RajuluS. (2014). An Ergonomic Evaluation of the Extravehicular Mobility Unit (EMU) Space Suit Hard Upper Torso (HUT) Size Effect on Metabolic, Mobility, and Strength Performance. Paper presented at the Human Factors and Ergonomic Socity Annual Meeting, Chicago, IL.
10.
StramlerJ. (1992). Occupational Ergonomics in Space. Paper presented at the 2nd Conference on Lunar Bases and Space Activities of the 21st Century, Houston, TX.
11.
StraussS.KrogR. L.FeivesonA. H. (2005). Extravehicular Mobility Unit Training and Astronaut Injuries. Aviation, Space, and Environmental Medicine, 76(5), 469-474.
12.
ViegasS. F.WilliamsD.JonesJ.StraussS.ClarkJ. (2004). Physical Demands and Injuries to the Upper Extremity Associated with the Space Program. The Journal of Hand Surgery, 29A(3), 359-366.
13.
WilliamsD. R.JohnsonB. J. (2003). EMU Shoulder Injury Tiger Team Report. (NASA/TM-2003-212058). National Aeronatics and Space Administration.
