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on Jan 23rd 2009, 11:18:16, Truongson wrote the following about

seasickness

Researching the changes of some norms of cardiovascular functions of seafarers by test a sea wave withstanding capacity
Tran Thi Quynh Chi1,
Nguyen Truong Son2
1: Department of Maritime working Medicine, VINIMAM
2: Vietnam National Institute of Maritime Medicine (VINIMAM)
1. Introduction
Seasickness cause many changes for bodies’s functions, paticularly function of cardiovascular system. The people with differential ability of withstand wave will have differential changes for bodies’s functions as cardio-vascular, nervous system...How can we diagnose wave withstand ability of every body in oder to fit for duty at sea?
The aim
• Researching the change of some cardiovascular functional norms of seafarers by test a sea wave withstanding capacity.
• Analyzing the change of some characteristics of cardiovascular system of researching groups in order to define their sea wave withstanding capacity. Base on these researching results, to apply selecting the sea wave withstanding capacity of seafarers in Viet Nam.
2. Methods
• Interview 150 seafarers with maritime working time over 2 years to select 3 groups:
 – First group: 50 persons with good ability of wave withstand (never been seasickness);
 – Second group: 50 persons with bad ability of wave withstand (regular seasickness);
 – Third group: 50 persons with average ability of wave withstand (light seasickness);
• Evaluating and comparing the changes of some norms of cardio-vascular functions as: pulse frequence, cardiac frequence, arterial blood pressure, PQ interval (ECG)] of 3 groups before and after tested a sea wave withstanding capacity.
3. Results
The results obtained as follow:
In good ability group of wave withstand: The cardiac frequency and arterial blood pressure increased clearly (80,94  8,74 to 91,19  7,68 and 119,36  4,43 to 139,455,73). PQ interval is shorter (0,16  0,02 to 0,14  0,05) which showed the upward tendency of hypersympathetic nervous system.
In the bad ability group of wave withstand: The cardiac frequency, blood pressure decreased clearly (81,105,61 to 64,15  5,10 and 123,73  5,40 to 10,60  4,45), PQ interval prolongs (0,14  0,05 to 0,18  0,06) which showed the upward tendency of hyperparasympathetic nervous system.
In the not very well ability group of wave withstand: The cardiac frequency, artery blood pressure, PQ interval changed not significantly.
4. Conclusion
Having clear changes of cardiovascular functional norms of seafarers by test a sea wave withstanding capacity, which have showed that these norms could be applied excellently to select the sea wave withstanding capacity of Vietnamese seafarers.

TOPIC: 25 – Ship motion and seasickness
ABSTRACT AREA: A & B
KEYWORDS: Sea wave withstanding capacity; Hypersympathetic; Hyperparasympathetic
Preferred Presentation Mode: Oral
Submitting author:
Nguyen Truong Son: Prof.PhD.MD
Director of VINIMAM,
The head of Dept.Of Maritime Medicine, Haiphong Medical University
Add: 513 Nguyen Van Linh Avenue, Le Chan Dist., Haiphong city, Vietnam
Phone: 84-313 212898; handphone: 84-913 245 069; Fax: 84 – 313 519687; E-mail: yhb@hn.vnn.vn; vinimam@vnn.vn

TOPIC: 25 – Ship motion and seasickness
ABSTRACT AREA: A & B
KEYWORDS: Electroencephalogram, Sea wave withstanding capacity; Hyperparasympathetic
Preferred Presentation Mode: Oral
Submitting author:
Trieu Thi Thuy Huong: MD; Tran Thi Quynh Chi
Department of Maritime working Medicine of VINIMAM,
Add: 513 Nguyen Van Linh Avenue, Le Chan Dist., Haiphong city, Vietnam
Phone: 84-313 212898;; Fax: 84 – 313 519687; E-mail: yhb@hn.vnn.vn; vinimam@vnn.vn
Handphone Huong: 84-904 336 617; Handphone Quynh Chi: +84-904 123 976



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