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Protection to +12 Gz.
Aviat Space Environ Med. 2001 May; 72(5):413-21.AS

Abstract

BACKGROUND

The U.S. Air Force has developed +Gz-protective equipment that will provide most pilots protection to +9 Gz with minimal-to-no straining. This equipment includes a pressure breathing system called COMBAT EDGE (CE), which is currently operational, and the Advanced Technology Anti-G Suit (ATAGS), which is not yet operational. For future high-performance aircraft design it is important to know the upper limit of various protective equipment and techniques.

METHODS

Six subjects were randomly exposed to a 12-cell matrix composed of +Gz and the following combinations of protective equipment at three seat-back angles (13 degrees, 30 degrees and 55 degrees from the vertical): 1) the standard CSU-13B/P anti-G suit (STD); 2) the STD suit with CE; 3) the ATAGS; and 4) the ATAGS with CE. Relaxed, followed by straining +Gz tolerance was determined using 15-s rapid onset runs to a maximum of +12 Gz. A comprehensive battery of baseline and post-exposure medical surveillance studies was performed to evaluate the medical consequences of these high +Gz exposures.

RESULTS

All 6 subjects were able to achieve +12 Gz with various combinations of +Gz-protective equipment, seat-back angle, and various amounts of straining, from none to maximum. When the data were collapsed over all protective equipment there was a significant (p < 0.05) seat effect. Relaxed tolerance to ROR increased with seat-back angle from 13 degrees to 30 degrees to 55 degrees. There was also a significant protective equipment effect when the data were collapsed over all seat-back angles.

CONCLUSIONS

These data confirm that effortless protection to +9 Gz is available using ATAGS/CE with the 13 degree and 30 degree seat-back angle (F-15, F-16 and F-22) and to +10.5 Gz with a 55 degree seat-back angle. Moreover, with ATAGS/CE, and a moderate degree of straining, +12 Gz is definitely achievable at 55 degrees, even with reduced anti-G suit pressure at 55 degrees. With additional straining +12 GC is also achievable at the 13 degree and 30 degree seat-back angles.

Authors+Show Affiliations

Burns JW
School of Aerospace Medicine, Brooks AFB, TX, USA.
Ivan DJ
No affiliation info available
Stern CH
No affiliation info available
Patterson JC
No affiliation info available
Johnson PC
No affiliation info available
Drew WE
No affiliation info available
Yates JT
No affiliation info available

MeSH

AccelerationAdultAerospace MedicineAnalysis of VarianceEquipment DesignFemaleGravity SuitsHeart RateHumansHypergravityMalePressure

Pub Type(s)

Clinical Trial
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

11346005

Citation

Burns, J W., et al. "Protection to +12 Gz." Aviation, Space, and Environmental Medicine, vol. 72, no. 5, 2001, pp. 413-21.
Burns JW, Ivan DJ, Stern CH, et al. Protection to +12 Gz. Aviat Space Environ Med. 2001;72(5):413-21.
Burns, J. W., Ivan, D. J., Stern, C. H., Patterson, J. C., Johnson, P. C., Drew, W. E., & Yates, J. T. (2001). Protection to +12 Gz. Aviation, Space, and Environmental Medicine, 72(5), 413-21.
Burns JW, et al. Protection to +12 Gz. Aviat Space Environ Med. 2001;72(5):413-21. PubMed PMID: 11346005.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Protection to +12 Gz. AU - Burns,J W, AU - Ivan,D J, AU - Stern,C H, AU - Patterson,J C, AU - Johnson,P C, AU - Drew,W E, AU - Yates,J T, PY - 2001/5/11/pubmed PY - 2001/10/5/medline PY - 2001/5/11/entrez SP - 413 EP - 21 JF - Aviation, space, and environmental medicine JO - Aviat Space Environ Med VL - 72 IS - 5 N2 - BACKGROUND: The U.S. Air Force has developed +Gz-protective equipment that will provide most pilots protection to +9 Gz with minimal-to-no straining. This equipment includes a pressure breathing system called COMBAT EDGE (CE), which is currently operational, and the Advanced Technology Anti-G Suit (ATAGS), which is not yet operational. For future high-performance aircraft design it is important to know the upper limit of various protective equipment and techniques. METHODS: Six subjects were randomly exposed to a 12-cell matrix composed of +Gz and the following combinations of protective equipment at three seat-back angles (13 degrees, 30 degrees and 55 degrees from the vertical): 1) the standard CSU-13B/P anti-G suit (STD); 2) the STD suit with CE; 3) the ATAGS; and 4) the ATAGS with CE. Relaxed, followed by straining +Gz tolerance was determined using 15-s rapid onset runs to a maximum of +12 Gz. A comprehensive battery of baseline and post-exposure medical surveillance studies was performed to evaluate the medical consequences of these high +Gz exposures. RESULTS: All 6 subjects were able to achieve +12 Gz with various combinations of +Gz-protective equipment, seat-back angle, and various amounts of straining, from none to maximum. When the data were collapsed over all protective equipment there was a significant (p < 0.05) seat effect. Relaxed tolerance to ROR increased with seat-back angle from 13 degrees to 30 degrees to 55 degrees. There was also a significant protective equipment effect when the data were collapsed over all seat-back angles. CONCLUSIONS: These data confirm that effortless protection to +9 Gz is available using ATAGS/CE with the 13 degree and 30 degree seat-back angle (F-15, F-16 and F-22) and to +10.5 Gz with a 55 degree seat-back angle. Moreover, with ATAGS/CE, and a moderate degree of straining, +12 Gz is definitely achievable at 55 degrees, even with reduced anti-G suit pressure at 55 degrees. With additional straining +12 GC is also achievable at the 13 degree and 30 degree seat-back angles. SN - 0095-6562 UR - https://www.unboundmedicine.com/medline/citation/11346005/Protection_to_+12_Gz_ DB - PRIME DP - Unbound Medicine ER -