[Behavior of central venous blood temperature in short duration and repeated stress--possibilities for temperature controlled frequency-adapted pacemaker stimulation].
Although an exercise-induced increase in blood temperature has been well-known for some time, there was still some doubt whether the change in central venous blood temperature with short-lasting and repetitive physical exercise can be measured and utilized by a temperature controlled pacing system. We studied the central venous blood temperature with short-lasting and repetitive exercise in ten healthy young volunteers and in ten pacemaker patients. The blood temperature was measured intracardially while they walked upstairs. A height of 20 m was covered within 100 +/- 5 s. An oxygen uptake of 27 ml/min/kg was calculated for this level of exercise. After walking upstairs once, the volunteers had an increase in central venous blood temperature of 0.3 degrees C and the pacemaker patients of 0.37 degrees C. After walking upstairs three times, the volunteers had an overall rise in blood temperature of 0.67 degrees C and the pacemaker patients of 0.86 degrees C. Thus, the central venous blood temperature shows a pronounced, measurable increase with short-lasting exercise as well. However, the rises in blood temperature accumulate with repetitive exercise, as the duration of exercise (100 s) when walking upstairs once is not sufficient for a new level of temperature to be reached according to the level of exercise. Thus, a temperature controlled pacing system should take these complex changes into consideration.
Alt
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Medizinische Klinik, Technischen Universität München.
Hirgstetter
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Theres
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Heinz
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M
D000328:Adult; D000368:Aged; D001833:Body Temperature Regulation; D001919:Bradycardia / Q000628:therapy*; D005260:Female; D006327:Heart Block / Q000628:therapy*; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D005082:Physical Exertion; D012804:Sick Sinus Syndrome / Q000628:therapy*; D014680:Veins
Verhalten der zentralvenösen Bluttemperatur bei kurzdauernden und wiederholten Belastungen--Möglichkeiten für eine temperaturgesteuerte frequenzadaptive Schrittmacherstimulation.