EFFECT OF GRAVITY LOADING COUNTERMEASURES SKINSUIT UPON THE HAEMODYNAMIC RESPONSES TO ORTHOSTATIC STRESS

METHODS: Eight participants ([male] =5; 28.4 + or - 5.9yrs; 182.6 + or - 9.7cm; and 77.3 + or - 8.3kg) gave written informed consent to participate in the study which had received local ethical approval. Subjects spent ten minutes in the SUPINE, 60[degrees] head-up tilt (HUT) and 10[degrees] head-do...

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Published in:Aviation, space, and environmental medicine space, and environmental medicine, 2014-03, Vol.85 (3), p.272-272
Main Authors: Carvil, P, Cinelli, I, Waldie, J, Green, D
Format: Article
Language:English
Subjects:
Blood pressure
Camber
Computational fluid dynamics
Deltas
Discomfort
Fluids
Intervals
Tilt
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Summary:METHODS: Eight participants ([male] =5; 28.4 + or - 5.9yrs; 182.6 + or - 9.7cm; and 77.3 + or - 8.3kg) gave written informed consent to participate in the study which had received local ethical approval. Subjects spent ten minutes in the SUPINE, 60[degrees] head-up tilt (HUT) and 10[degrees] head-down (HDT) orientation on a tilt table, separated by >10 minute rest, wearing either a tailored GLCS, or gym attire (GYM) on separate (randomised) days. Leg and arm fluid volume and subjective movement discomfort/body control (0-10) were assessed during each tilt. Finger blood pressure (and Modelflow(C) derivatives), R-R interval, and heart rate variability (HRV) were recorded throughout and compared ([Delta]) with the 30 sub(s) preceding each tilt. RESULTS: GLCS leg volume in the GLCS was significantly greater (9.57 + or - 0.8L) than GYM (9.09 + or - 0.9L) when supine, and in HUT or HDT with no interaction. [Delta] Diastolic and systolic blood pressure, R-R interval, stroke volume and cardiac output were similar between attires in all conditions. However, pulse pressure decremented more in the GLCS (-4.8 + or - 1.9 vs. -0.7 + or - 1.2 mmHg) in the first 5s of HDT. Total peripheral resistance, was significantly higher in GYM (112 + or - 22[Omega]) vs. GLCS (27 + or - 15[Omega]) across HDT. Greater very low frequency HRV was noted in the GLCS when supine (2329 + or - 523 vs. 1185 + or - 256 Hz). Greater subjective movement discomfort and body control were reported in both HUT and HDT in the GLCS. DISCUSSION: Thus, whilst minor subjective discomfort was experienced, the GLCS does not appear to significantly impact upon haemodynamic responses to orthostatic stress, suggesting that compressive effects are minimal. However its effect on microgravity induced fluid shifts requires investigation.
ISSN:0095-6562