Circulatory effects of fluid loss and fluid uptake during exercise
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1983
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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ENDURANCE; EXERCISE; SWEATING; BODY-WEIGHT; CARDIAC-OUTPUT; HEART-RATE; STROKE-VOLUME; BEVERAGE; HEAT-EXHAUSTION; TEMPERATURE; BICYCLE-ERGOMETRY; MAN; ATHLETE; ELITE-ATHLETE
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DISCIPLINE:
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No discipline assigned
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-366-204
(Last edited on
2002/02/27 18:45:05 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
Cardiorespiratory responses to two level of exercise on a bicycle ergometer were measured in nine subjects before and after a 1-h outdoor run of 12.8 km completed in ambient temperatures of 20-25 degree C. After the run, the subjects showed a mean weight loss of 1.49 kg; the laboratory exercises produced higher mean levels of O2 consumption than before the run and higher mean heart rates (141 and 158 beats min -1 compared with 115 and 140 beats min -1); and lower levels of stroke volume and of cardiac output. Five subjects were studied in a similar way on a second occasion when they consumed 1.251 of a dextrose-electrolyte solution during the first 45 min of the outdoor run. Differences in the exercise variables measured before and after the outdoor run were now small or insignificent. It is postulated that in the first study uncompensated loss of body water reduced plasma volume and cardiac filling, thus reducing stroke volume and cardiac output. Such changes jeopardize body temperature regulation during exercise.
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STATISTICS
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