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[Effect of lower body negative pressure and rotating-table simulated push-pull effect in flight on cardiovascular function].
Space Med Med Eng (Beijing). 2001 Dec; 14(6):400-4.SM

Abstract

Objective. To explore the effect of push-pull effect (PPE) simulated by lower body negative pressure (LBNP) rotating-table, and observe the physiological responses to push-pull maneuver. Method. A special LBNP rotating-table was used to simulate the push-pull maneuver. 8 healthy adults participated randomly in two experiments. One was simulated PPE test, which include a series of head-up stand (HUT, +1 Gz) for 1 min, then in head-down stand (HDT, -1 Gz) for 30 s and again in HUT combining LBNP (-50 mmHg) for 10 min. The other one was control test, which only consists of HUT combining LBNP (-50 mmHg) for 10 min. Changes of heart rate (HR), blood pressure (BP), basic impedance (Z0) , stroke output (SO) , cardiac output (CO) and total peripheral resistance (TPR) were monitored by electrical impedance instrument during the experiment. Result. During simulated PPE experiment, 3 subjects presented presyncopal symptoms, with average standing time of 8.99 +/- 1.47 min, while during control test, all the subjects completed HUT combining LBNP for 10 min. In simulated PPE experiment, as compared with HUT (control), HR, Z0 during HDT were significantly lowered, while SV and CO were increased significantly. During HUT + LBNP, HR, Z0 and TPR were significantly higher, while SV and CO were significantly lower than that of control and HDT. SBP was increased significantly than control value when "HUT + LBNP" started, but during the whole process of "HUT + LBNP ", it became significantly lowered. In control experiment, the above mentioned indexes showed the same trend of as change compared with the control, however, the percentage of the change was lower than simulated PPE test, the change percentage in HR was not including. Conclusion. After headstand, head-up stand combining LBNP caused cardiovascular function descends, the degree was larger than simple head-up stand combining LBNP. LBNP rotating-table can be used to simulated push-pull effect.

Authors+Show Affiliations

Yao YJ
Department of Aerospace Biodynamics, The Fourth Military Medical University, Xi'an, China.
Zhao ZG
No affiliation info available
Liu TS
No affiliation info available
Shi J
No affiliation info available
Hou BK
No affiliation info available
Yang CB
No affiliation info available

MeSH

AdultCardiovascular Physiological PhenomenaEvaluation Studies as TopicGravitationHead-Down TiltHemodynamicsHumansLower Body Negative PressurePostureRotationSyncopeWeightlessness Simulation

Pub Type(s)

Clinical Trial
Comparative Study
English Abstract
Journal Article
Randomized Controlled Trial

Language

chi

PubMed ID

11887892

Citation

Yao, Y J., et al. "[Effect of Lower Body Negative Pressure and Rotating-table Simulated Push-pull Effect in Flight On Cardiovascular Function]." Hang Tian Yi Xue Yu Yi Xue Gong Cheng = Space Medicine & Medical Engineering, vol. 14, no. 6, 2001, pp. 400-4.
Yao YJ, Zhao ZG, Liu TS, et al. [Effect of lower body negative pressure and rotating-table simulated push-pull effect in flight on cardiovascular function]. Space Med Med Eng (Beijing). 2001;14(6):400-4.
Yao, Y. J., Zhao, Z. G., Liu, T. S., Shi, J., Hou, B. K., & Yang, C. B. (2001). [Effect of lower body negative pressure and rotating-table simulated push-pull effect in flight on cardiovascular function]. Hang Tian Yi Xue Yu Yi Xue Gong Cheng = Space Medicine & Medical Engineering, 14(6), 400-4.
Yao YJ, et al. [Effect of Lower Body Negative Pressure and Rotating-table Simulated Push-pull Effect in Flight On Cardiovascular Function]. Space Med Med Eng (Beijing). 2001;14(6):400-4. PubMed PMID: 11887892.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [Effect of lower body negative pressure and rotating-table simulated push-pull effect in flight on cardiovascular function]. AU - Yao,Y J, AU - Zhao,Z G, AU - Liu,T S, AU - Shi,J, AU - Hou,B K, AU - Yang,C B, PY - 2002/3/13/pubmed PY - 2002/5/25/medline PY - 2002/3/13/entrez SP - 400 EP - 4 JF - Hang tian yi xue yu yi xue gong cheng = Space medicine & medical engineering JO - Space Med Med Eng (Beijing) VL - 14 IS - 6 N2 - Objective. To explore the effect of push-pull effect (PPE) simulated by lower body negative pressure (LBNP) rotating-table, and observe the physiological responses to push-pull maneuver. Method. A special LBNP rotating-table was used to simulate the push-pull maneuver. 8 healthy adults participated randomly in two experiments. One was simulated PPE test, which include a series of head-up stand (HUT, +1 Gz) for 1 min, then in head-down stand (HDT, -1 Gz) for 30 s and again in HUT combining LBNP (-50 mmHg) for 10 min. The other one was control test, which only consists of HUT combining LBNP (-50 mmHg) for 10 min. Changes of heart rate (HR), blood pressure (BP), basic impedance (Z0) , stroke output (SO) , cardiac output (CO) and total peripheral resistance (TPR) were monitored by electrical impedance instrument during the experiment. Result. During simulated PPE experiment, 3 subjects presented presyncopal symptoms, with average standing time of 8.99 +/- 1.47 min, while during control test, all the subjects completed HUT combining LBNP for 10 min. In simulated PPE experiment, as compared with HUT (control), HR, Z0 during HDT were significantly lowered, while SV and CO were increased significantly. During HUT + LBNP, HR, Z0 and TPR were significantly higher, while SV and CO were significantly lower than that of control and HDT. SBP was increased significantly than control value when "HUT + LBNP" started, but during the whole process of "HUT + LBNP ", it became significantly lowered. In control experiment, the above mentioned indexes showed the same trend of as change compared with the control, however, the percentage of the change was lower than simulated PPE test, the change percentage in HR was not including. Conclusion. After headstand, head-up stand combining LBNP caused cardiovascular function descends, the degree was larger than simple head-up stand combining LBNP. LBNP rotating-table can be used to simulated push-pull effect. SN - 1002-0837 UR - https://www.unboundmedicine.com/medline/citation/11887892/[Effect_of_lower_body_negative_pressure_and_rotating_table_simulated_push_pull_effect_in_flight_on_cardiovascular_function]_ L2 - https://medlineplus.gov/guidetogoodposture.html DB - PRIME DP - Unbound Medicine ER -