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Cardiovascular responses to cold wat...

Chen, Hui-Min.

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Cardiovascular responses to cold water hand immersion.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Cardiovascular responses to cold water hand immersion./
作者:	Chen, Hui-Min.
面頁冊數:	122 p.
附註:	Source: Dissertation Abstracts International, Volume: 50-08, Section: B, page: 3256.
Contained By:	Dissertation Abstracts International50-08B.
標題:	Biology, General. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9001119

Cardiovascular responses to cold water hand immersion.
Chen, Hui-Min.

Cardiovascular responses to cold water hand immersion. - 122 p.

Source: Dissertation Abstracts International, Volume: 50-08, Section: B, page: 3256.

Thesis (Ph.D.)--University of California, Santa Barbara, 1989.

Cold water hand immersion is performed by immersing the subject's hand in cold water. The consequent elevated blood pressure response had been noted. The procedure was utilized as a clinical tool for detecting cardiovascular responsiveness. Previous studies emphasized blood pressure and heart rate responses, with some attention given to cardiac output and systolic time intervals. Two studies utilized dye-dilution techniques to measure stroke volume. Investigators have varied the duration of immersion, temperature of the water bath, position assumed during the immersion and the extremity immersed which make it difficult to interpret the results. Age, gender, physical fitness and the cold acclimation of the subjects modified the responses. To further our understanding of the mechanism that underlies the local cold exposure of the hand, we utilized impedance cardiography, a non-invasive method, to measure heart rate, cardiac output, stroke volume and systolic time intervals on a beat by beat basis. Blood pressure was recorded simultaneously. The effect of duration of immersion, prior condition of the immersed hand, posture and gender differences were evaluated.Subjects--Topical Terms:

1018625
Biology, General.

Cardiovascular responses to cold water hand immersion.
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100 1 $a Chen, Hui-Min. $3 1259448
245 1 0 $a Cardiovascular responses to cold water hand immersion.
300 $a 122 p.
500 $a Source: Dissertation Abstracts International, Volume: 50-08, Section: B, page: 3256.
500 $a Chair: Steven M. Horvath.
502 $a Thesis (Ph.D.)--University of California, Santa Barbara, 1989.
520 $a Cold water hand immersion is performed by immersing the subject's hand in cold water. The consequent elevated blood pressure response had been noted. The procedure was utilized as a clinical tool for detecting cardiovascular responsiveness. Previous studies emphasized blood pressure and heart rate responses, with some attention given to cardiac output and systolic time intervals. Two studies utilized dye-dilution techniques to measure stroke volume. Investigators have varied the duration of immersion, temperature of the water bath, position assumed during the immersion and the extremity immersed which make it difficult to interpret the results. Age, gender, physical fitness and the cold acclimation of the subjects modified the responses. To further our understanding of the mechanism that underlies the local cold exposure of the hand, we utilized impedance cardiography, a non-invasive method, to measure heart rate, cardiac output, stroke volume and systolic time intervals on a beat by beat basis. Blood pressure was recorded simultaneously. The effect of duration of immersion, prior condition of the immersed hand, posture and gender differences were evaluated.
520 $a We showed that cardiovascular responses varied with duration of immersion. Women had a greater systolic blood pressure in the third minute of the immersion. Previous studies utilizing a 1 or 2 minute immersion were insufficient to reveal the delayed responses. The responses between seated and supine positions were similar. Local vasoconstriction and/or the numb sensation of the immersed hand resulted in a smaller response during the second immersion. The elevated blood pressure response was the result of systemic vasoconstriction. The decreased cardiac output was the result of increased heart rate and decreased stroke volume. Tachycardia resulted in decreased left ventricular ejection times in the first 30 seconds. Elevated blood pressure prolonged the pre-ejection period, left ventricular ejection time and electromechanical systole during minute 3. Decreased DZmax indicated decreased myocardial contractility which might be due the elevated blood pressure. These findings suggest that a systemic vasoconstriction mediated through sympathetic stimulation occurred during cold water hand immersion.
590 $a School code: 0035.
650 4 $a Biology, General. $3 1018625
650 4 $a Biology, Animal Physiology. $3 1017835
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