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Influence of a reduced G-suit pressure schedule on G-duration tolerance using enhanced G-protection ensembles.
Aviat Space Environ Med. 1997 May; 68(5):403-9.AS

Abstract

BACKGROUND

Reducing pressure to enhanced G-protection ensembles may diminish potential undesirable physiologic effects, as well as improve wear comfort and garment durability.

HYPOTHESIS

G-duration tolerance will not be affected by reducing pressure to the Swedish tactical flight combat suit (TFCS). A second objective tested the similarity in G-duration tolerance between the TFCS and Combined Advanced Technology Enhanced Design G-Ensemble (COMBAT EDGE) combined with a prototype enhanced coverage G-suit.

METHODS

There were 12 Swedish pilots (mean = 30 yr) who experienced gradual onset (+0.1 G.s-1) runs (GOR) to +9 Gz, rapid (+6 G.s-1) onset runs (ROR) and simulated aerial combat maneuvers (SACM) with +5 to +9 Gz cycles. The GOR and ROR profiles had a sustained times of 60 s after reaching +9 Gz.

RESULTS

GOR duration tolerance was statistically decreased (p < 0.01) by the lower pressure (1.1 psig.G-1) when compared to standard pressure (1.5 psig.G-1). No statistical difference between TFCS and COMBAT EDGE was observed during the GOR trials. For all conditions, during the RORs, 90% of the subjects completed at least 30 s at +9 Gz. Many technical or medical difficulties during SACM trials limited statistical treatment of these data. However, no obvious among-condition differences were observed. Noteworthy among SACM trials were those of 3 subjects enduring more than 9 min before stopping; one completing 12.5 min (35 cycles). Neither heart rate, blood pressure, nor perceived exertion data revealed a condition-effect difference.

CONCLUSION

Moderately reduced pressure to the extended coverage anti-G suit, combined with positive pressure breathing, may yield decreased G-tolerance results during laboratory evaluation; however, observed differences are sufficiently small they are likely operationally insignificant.

Authors+Show Affiliations

Armstrong Laboratory, Brooks AFB, TX 78235-5119, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

9143750

Citation

Krock, L P., et al. "Influence of a Reduced G-suit Pressure Schedule On G-duration Tolerance Using Enhanced G-protection Ensembles." Aviation, Space, and Environmental Medicine, vol. 68, no. 5, 1997, pp. 403-9.
Krock LP, Balldin UI, Harms-Ringdahl K, et al. Influence of a reduced G-suit pressure schedule on G-duration tolerance using enhanced G-protection ensembles. Aviat Space Environ Med. 1997;68(5):403-9.
Krock, L. P., Balldin, U. I., Harms-Ringdahl, K., Singstad, C. P., Linder, J., & Siegborn, J. (1997). Influence of a reduced G-suit pressure schedule on G-duration tolerance using enhanced G-protection ensembles. Aviation, Space, and Environmental Medicine, 68(5), 403-9.
Krock LP, et al. Influence of a Reduced G-suit Pressure Schedule On G-duration Tolerance Using Enhanced G-protection Ensembles. Aviat Space Environ Med. 1997;68(5):403-9. PubMed PMID: 9143750.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of a reduced G-suit pressure schedule on G-duration tolerance using enhanced G-protection ensembles. AU - Krock,L P, AU - Balldin,U I, AU - Harms-Ringdahl,K, AU - Singstad,C P, AU - Linder,J, AU - Siegborn,J, PY - 1997/5/1/pubmed PY - 1997/5/1/medline PY - 1997/5/1/entrez SP - 403 EP - 9 JF - Aviation, space, and environmental medicine JO - Aviat Space Environ Med VL - 68 IS - 5 N2 - BACKGROUND: Reducing pressure to enhanced G-protection ensembles may diminish potential undesirable physiologic effects, as well as improve wear comfort and garment durability. HYPOTHESIS: G-duration tolerance will not be affected by reducing pressure to the Swedish tactical flight combat suit (TFCS). A second objective tested the similarity in G-duration tolerance between the TFCS and Combined Advanced Technology Enhanced Design G-Ensemble (COMBAT EDGE) combined with a prototype enhanced coverage G-suit. METHODS: There were 12 Swedish pilots (mean = 30 yr) who experienced gradual onset (+0.1 G.s-1) runs (GOR) to +9 Gz, rapid (+6 G.s-1) onset runs (ROR) and simulated aerial combat maneuvers (SACM) with +5 to +9 Gz cycles. The GOR and ROR profiles had a sustained times of 60 s after reaching +9 Gz. RESULTS: GOR duration tolerance was statistically decreased (p < 0.01) by the lower pressure (1.1 psig.G-1) when compared to standard pressure (1.5 psig.G-1). No statistical difference between TFCS and COMBAT EDGE was observed during the GOR trials. For all conditions, during the RORs, 90% of the subjects completed at least 30 s at +9 Gz. Many technical or medical difficulties during SACM trials limited statistical treatment of these data. However, no obvious among-condition differences were observed. Noteworthy among SACM trials were those of 3 subjects enduring more than 9 min before stopping; one completing 12.5 min (35 cycles). Neither heart rate, blood pressure, nor perceived exertion data revealed a condition-effect difference. CONCLUSION: Moderately reduced pressure to the extended coverage anti-G suit, combined with positive pressure breathing, may yield decreased G-tolerance results during laboratory evaluation; however, observed differences are sufficiently small they are likely operationally insignificant. SN - 0095-6562 UR - https://www.unboundmedicine.com/medline/citation/9143750/Influence_of_a_reduced_G_suit_pressure_schedule_on_G_duration_tolerance_using_enhanced_G_protection_ensembles_ L2 - https://medlineplus.gov/veteransandmilitaryhealth.html DB - PRIME DP - Unbound Medicine ER -