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Biomedical subjects

H G Gu

Publications and source records attributed to H G Gu.

9 recordsLinked to original sources
PubMed2001

[Effects of running armored car on dynamic posture equilibrium].

Objective. To study the effects of training in running armored car on dynamic posture equilibrium. Method. Dynamic posture was tested pre- and post running armored car in 56 healthy men. Result. Compared to pre-training, certain equilibrium scores of sensory organization test condition 1 (P<0.05), 2 (P< 0.001), and 3 (P< 0.001) decreased significantly, while those of condition 4 (P<0.001) and 6 (P< 0.001) increased significantly. The static proprioception score (SOT2/SOT1 x 100) (P< 0.01) decreased significantly, while visual sensory score (SOT4/SOT1 x 100, P <0.01) and dynamic proprioception (SOT (4+5+6)/SOT(1+2+3) x 100, P<0.001) increased significantly post-training. The motor strategy scores of sensory organization test condition 2 (P<0.01) and 3 (P<0.001) significantly decreased. Conclusion. The results demonstrated that training in a running armored car influenced postural equilibrium and sensory organization.

Adult↗
PubMed2001

[Application of degree of complexity in heart rate variability analysis during orthostatic (correction of orthosatic) standing].

Objective. To introduce the degree of complexity in characterizing heart rate variability (HRV), and to discuss the changes in complexity of the cardiovascular system during orthostatic standing posture. Method. ECG of 8 subjects were recorded during supine and orthostatic standing postures. Degree of complexity was used to analyze the HRV. Result. Compared to supine before orthostatic standing posture, R-R intervals and its standard deviation at 0-5 min, 5-10 min, 10-15 min and 15-20 min during orthostatic standing posture were decreased significantly; the degree of complexity of HRV at 0-5 min and 15-20 min during orthostatic standing posture were decreased significantly; the approximate entropy of 0-5 min and 15-20 min were decreased significantly. Conclusion. The results showed that HRV and complexity of cardiovascular system was decreased during orthostatic standing. It was feasible that the degree of complexity can be used to analyze HRV.

Adolescent↗
PubMed2000

[c-fos expression in rat's vestibular nucleus under eccentric rotational stimulation].

OBJECTIVE: To investigate the c-fos expression in rat's vestibular nucleus under eccentric rotational stimulation and the effects of anti-motion sickness drug (PAPM) on this expression. METHOD: 19 SD rats were divided into three groups: A, B and C. A received as control. B was stimulated by eccentric rotation for 60 minutes. C received injection of PAPM through cavun abdominis 45 min before eccentric rotation. Immunohistochemical method and computerized image analysis were used to map locations of c-fos protein appeared in four vestibular nucleus and to count the masculine cells. RESULT: c-fos protein appeared in four vestibular nucleus areas after stimulation, and PAPM had no influence on this expression. CONCLUSION: It suggests that c-fos expression in vestibular nucleus is one of the important way in which vestibular nervous system reacts to outside stimulation and this expression has no direct relationship with the generation and development of motion sickness.

Aerospace Medicine↗
PubMed2000

[Approximate entropy and its application in heart rate variability analysis].

Objective. To introduce approximate entropy in the analysis of heart rate variability, and to discuss the changes of the complexity of cardiovascular system during orthostatic standing posture. Method. ECG of 8 subjects were recorded during supine and orthostatic standing postures. Approximate entropy was used to analyze HRV. Result. Compared to supine before orthostatic standing posture, R-R intervals at 0-5 min, 5-10 min, 10-15 min and 15-20 min during orthostatic standing posture were decreased significantly, while approximate entropy at 0-5 min and 15-20 min decreased significantly. It showed that the complexity of cardiovascular system was decreased and the modulation of cardiovascular system changed. Conclusion. It is feasible that approximate entropy be used for heart rate variability analysis.

Adolescent↗
PubMed1999

[Comparison between motion sickness induced by reversed vision and that by parallel swing].

OBJECTIVE: To make clear the characteristics of motion sickness induced by reversed vision and to see whether it can be used in motion sickness experiments. METHODS: 10 healthy young men experienced walking tests wearing up-down or left-right reversing prisms, and parallel swing test on different days with intervals of 5-7d. Ataxia and motion sickness symptoms induced by walking wearing reversing prisms and those by parallel swing were observed. The reversed vision tolerance index (RVTI) and linear acceleration tolerance index (LATI) were calculated by an empirical formula. RESULTS: Both types of reversing prisms can induce obvious ataxia and motion sickness symptoms. The ataxia is correlative (P<0.05) with the susceptibility to motion sickness. In comparison with symptoms of swing motion sickness, the symptoms of reversed vision motion sickness are not too serious and appear slowly. There are correlativities (P< 0.01) between the susceptibility to motion sickness induced by up-down and left-right reversing prisms. The susceptibilities to motion sickness induced by reversing prisms are not correlative completely with that by swing. CONCLUSION: Reversed vision test is simple and easy and can be used for simulating space motion sickness or training of adaptation to sensory conflict on the ground.

Acceleration↗
PubMed1999

[Recording and analysis of EGG and its application in space medicine].

To demonstrate the use of EGG in space medicine, especially in motion sickness, biological basis, recording, analysis of EGG used in space medicine, especially in motion sickness studies, were introduced. Several parameters of EGG were related to nausea in motion sickness. It is suggested that EGG can be used in studying nausea symptoms of motion sickness.

Aerospace Medicine↗
PubMed1999

[Effects of motion sickness evoked by parallel swing stimulation on posture equilibrium].

Objective. To study the effects of motion sickness on posture equilibrium. Method. Dynamic posture was tested pre- and following motion sickness evoked by parallel swing. 17 healthy men were divided into motion sickness sensitive group (12) and motion sickness insensitive groups (5) according to their endurance times and the severeness of symptom. Result. The composite equilibrium score significantly decreased post-swing in all subjects. The composite equilibrium score, certain other equilibrium scores (SOT4, SOT5 and SOT6), the strategy scores (STRAT4 and STRAT6) and the sensory score (SEN3 and SEN5) significantly decreased in the sensitive group, but unchanged in the insensitive group post-swing. The equilibrium score (SOT2), and the sensory score (SEN1) pre-swing, the strategy score (STRAT3) of insensitive group is significantly higher than the sensitive group. Conclusion. Motion sickness can influence postural equilibrium. Postural instability and instability of strategy are related to the sensitiveness to motion sickness.

Adolescent↗