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Decreased +gz tolerance following lower body positive pressure: simulated push-pull effect.
Aviat Space Environ Med. 2001 Nov; 72(11):1045-7.AS

Abstract

OBJECTIVE

The purpose of this study was to attempt to simulate the push-pull maneuver on a single-axis human centrifuge using lower body positive pressure (LBPP), and to observe the effect of the push-pull maneuver on +Gz tolerance.

METHODS

Six volunteers participated in the experiment. They were subjected to LBPP of up to 300 mm Hg for 1 min. Blood pressure (BP) and heart rate (HR) were monitored before, during and after LBPP. Immediately after LBPP, +Gz tolerance was measured on a human centrifuge.

RESULTS

During LBPP, systolic BP (SBP) and diastolic BP (DBP) increased significantly, mean arterial pressure (MAP) increased but not significantly, and HR decreased significantly. After LBPP, SBP and MAP decreased significantly, while DBP and HR decreased but not significantly. In all subjects, +Gz tolerance decreased after LBPP. The decreased value was 0.70 +/- 0.06 G, maximum 1.0 G and minimum 0.5 G.

CONCLUSION

The push-pull maneuver can be simulated on a single-axis human centrifuge using LBPP. The physiologic effects of LBPP were similar to those of -Gz. We observed that +Gz tolerance decreased after LBPP, which confirmed the push-pull effect from the experiment.

Authors+Show Affiliations

Zhang WX
5th Department, Institute of Aviation Medicine, Air Force, PLA, China. zhangwuxing@263.net
Zhan CL
No affiliation info available
Geng XC
No affiliation info available
Mu DW
No affiliation info available
Lu XIA
No affiliation info available
Yan GD
No affiliation info available
Chu X
No affiliation info available

MeSH

AccelerationAdolescentAdultBlood PressureCentrifugationFeasibility StudiesGravitationHeart RateHumansMalePressureWeightlessness Simulation

Pub Type(s)

Journal Article

Language

eng

PubMed ID

11718510

Citation

Zhang, W X., et al. "Decreased +gz Tolerance Following Lower Body Positive Pressure: Simulated Push-pull Effect." Aviation, Space, and Environmental Medicine, vol. 72, no. 11, 2001, pp. 1045-7.
Zhang WX, Zhan CL, Geng XC, et al. Decreased +gz tolerance following lower body positive pressure: simulated push-pull effect. Aviat Space Environ Med. 2001;72(11):1045-7.
Zhang, W. X., Zhan, C. L., Geng, X. C., Mu, D. W., Lu XIA, ., Yan, G. D., & Chu, X. (2001). Decreased +gz tolerance following lower body positive pressure: simulated push-pull effect. Aviation, Space, and Environmental Medicine, 72(11), 1045-7.
Zhang WX, et al. Decreased +gz Tolerance Following Lower Body Positive Pressure: Simulated Push-pull Effect. Aviat Space Environ Med. 2001;72(11):1045-7. PubMed PMID: 11718510.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Decreased +gz tolerance following lower body positive pressure: simulated push-pull effect. AU - Zhang,W X, AU - Zhan,C L, AU - Geng,X C, AU - Mu,D W, AU - Lu XIA,, AU - Yan,G D, AU - Chu,X, PY - 2001/11/23/pubmed PY - 2002/3/2/medline PY - 2001/11/23/entrez SP - 1045 EP - 7 JF - Aviation, space, and environmental medicine JO - Aviat Space Environ Med VL - 72 IS - 11 N2 - OBJECTIVE: The purpose of this study was to attempt to simulate the push-pull maneuver on a single-axis human centrifuge using lower body positive pressure (LBPP), and to observe the effect of the push-pull maneuver on +Gz tolerance. METHODS: Six volunteers participated in the experiment. They were subjected to LBPP of up to 300 mm Hg for 1 min. Blood pressure (BP) and heart rate (HR) were monitored before, during and after LBPP. Immediately after LBPP, +Gz tolerance was measured on a human centrifuge. RESULTS: During LBPP, systolic BP (SBP) and diastolic BP (DBP) increased significantly, mean arterial pressure (MAP) increased but not significantly, and HR decreased significantly. After LBPP, SBP and MAP decreased significantly, while DBP and HR decreased but not significantly. In all subjects, +Gz tolerance decreased after LBPP. The decreased value was 0.70 +/- 0.06 G, maximum 1.0 G and minimum 0.5 G. CONCLUSION: The push-pull maneuver can be simulated on a single-axis human centrifuge using LBPP. The physiologic effects of LBPP were similar to those of -Gz. We observed that +Gz tolerance decreased after LBPP, which confirmed the push-pull effect from the experiment. SN - 0095-6562 UR - https://www.unboundmedicine.com/medline/citation/11718510/Decreased_+gz_tolerance_following_lower_body_positive_pressure:_simulated_push_pull_effect_ DB - PRIME DP - Unbound Medicine ER -