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Sqn Ldr Parul Goel
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I have no financial relationships to disclose
I will not discuss off-label use and/or investigational use in my presentation
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Conventional aircraft +Gz acceleration
Gy accelerations rare
Studies 1960’s*
*Hershgold E. Roentgenographic study of humans during transverse acceleration. Aerospace Med. 1960;31:213-9
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Gy frequent
During “point”, “shoot” and “scoot” maneuvers (Super-agile aircraft)
Physiological response altered with Gy
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Effect of concurrent +Gy acceleration on +Gz tolerance
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Albery studied ±1/2Gy concurrent with +Gz *
↑in +Gz tolerance with concurrent Gy
*Albery WB. Acceleration in other axes affects +Gz tolerance: Dynamic centrifuge simulation of agile flight. Aviat. Space Environ. Med.
2004 Jan; 75(1): 1-6
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Popplow et al*
↓in arterial oxygen saturation ±1.5/2/2.5Gy & ±1/2Gz for 30s
Decreased arterial oxygen saturations
*Popplow JR, Veghte JH, Hudson KE. Cardiopulmonary responses to combined lateral and vertical acceleration. Aviat. Space
Environ. Med. 1983 Jul; 54(7): 632-6
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Scant literature
Contradictory findings
Necessity for further study
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High Performance Human Centrifuge (HPHC)
30 male
18-37 y
Institute Ethics Committee
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High Performance Human Centrifuge
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High Performance Human Centrifuge
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Control and Monitoring Station
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Ejection Seat Mock Up with Five Point Harness System
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Based on subjects’ experience:
Experienced [“E”]
Inexperienced [“IE”]
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Two centrifuge runs Run 1: pure +Gz run (0.1Gz/s) Run 2: combined acceleration run (+Gz/+2Gy)
+Gy *Baseline +1.4GzEnd point - +9Gz/Peripheral Light Loss
*Gell CF. Table of equivalents for acceleration terminology. Aerospace Medicine. 1961 Dec: 1109-11
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Baseline +1.4Gz
Profile 1 starts
+0.1Gz/sec
PLL/+9Gz
+Gz
Time
PURE +Gz Run
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Baseline +1.4Gz
0 Gy
Profile 2 begins
1Gy/sec
2 Gy
2Gy
+ 0.15Gz +0.1Gz/sec
PLL/+9Gz
+Gz/+2Gy Run
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LIGHT BAR
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Dead Man Switch (DMS)
Head back
Heart Rate (HR)
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Dead Man Switch
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Ejection seat mock up
Harness
Additional restraints
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Paired-t test
ANOVA with a post hoc tukey
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30 subjects 25 (83%) completed the protocol23 readings for +Gz tolerances 22 readings HR data
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No correlation
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ANTHROPOMETRIC DATA AGE 25.83±5.46 y
HEIGHT 171.7±5.89 cm WEIGHT 70.98±9.67 kg
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The relaxed +Gz tolerance
“Pure +Gz” 4.46±0.51 Gz (3.21-5.28 Gz)
“Combined 5.07±0.62 Gz (3.31-5.95Gz) acceleration”
Mean ↑ in tolerance 0.61 Gz
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 230.00.51.01.5
2.02.53.0
3.54.04.5
5.05.56.0
Comparison of +Gz Tolerance among both profiles
Subjects
+G
z To
lera
nce
+Gz RUN
+Gz/+2Gy RUN
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No significant difference“E” & “IE” group
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↑ in HR with ↑ in level of acceleration
Combined acceleration > pure +Gz
HR at PLL
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Comparison of the HR during Run 1 and 2
+1Gz
+1.4G
z
+1.4G
z
+2Gz
+3Gz PL
L
+1Gz
(Bac
k)
3 sec
(pos
t sto
p)
100
120
140
160
180+Gz+Gz/+2Gy
+Gz ACCELERATION
HEA
RT R
ATE
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 220
50
100
150
200
250
HR AT PLL
SUBJECTS
HE
AR
T R
ATE
HR at PLL (+Gz Run)HR at PLL(+Gz/+2Gy Run)
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↑ In relaxed +Gz tolerance
Albery (↑ of 0.4Gz - +2Gy)
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21/23 subjects - ↑ tolerance
Straining
↑ Venous return & peripheral vasoconstriction - ↑ in head level BP – ↑ +Gz tolerance
Straining tolerance likely to be similar
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Two mutually perpendicular accelerations
Increased magnitude and different direction
The visceral organs & vessels
↓ in hydrostatic effects
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Sensation of tumbling & being thrown out of seat
Fear & apprehension during the run - sympathetic system stimulation -↑ tolerance
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Nausea
Motion sick - ↑secretion of stress hormones
Albery - vestibular system
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Concurrent +2Gy contributed to a higher rise in HR
Better cardiovascular response
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A significant increase in +Gz tolerance (0.61Gz)
Better HR response
Straining by subjects & vestibular overstimulation
Contribute positively to the benefits of supermaneuverability
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Pure +Gz run
Combined acceleration run ‘Baseline’ of +1.4 Gz to +2Gy (+1Gy/s)Gz component steadily decreased to ~0Gz (+0.15 Gz)‘Pure Gy’ maintained for 1 sGz was gradually added at the
rate of 0.1 G/s
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Transient relative negative G
There was no significant difference in the HR at +1Gz and at +1Gz/+2Gy
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Effect of Concurrent +Gy Acceleration on +Gz ToleranceDisclosure Information 84th Annual AsMA Scientific Meeting Sqn Ldr Parul GoelSlide 3INTRODUCTIONSlide 5AIMPAST STUDIESSlide 8NEED FOR STUDYMATERIAL & METHODSSlide 11Slide 12Slide 13Slide 14Slide 15PROTOCOLSlide 17Slide 18Slide 19Slide 20Slide 21SEAT & HARNESSSTATISTICAL ANALYSISRESULTSRESULTS (CONTD.)Slide 26Slide 27Slide 28Slide 29Slide 30Slide 31DISCUSSIONDISCUSSIONSlide 34Slide 35Slide 36Slide 37CONCLUSIONSlide 39Slide 40Slide 41