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Results for “BODY FLUID BALANCE”

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At least 649 records · Page 36Linked to original sources
PubMed2006

Continuous thermoregulatory responses to mass-participation distance running in heat.

PURPOSE: To continuously measure core temperature (T(c)) and heart rate(HR), and quantify fluid balance during a 21-km mass-participation road racein warm, humid environmental conditions. METHODS: Eighteen heat-acclimatized male soldiers ingested a telemetric Tc sensor on the evening prior to the race and wore an ambulatory T(c) data recorder and HR monitor during the race. Pre- to postrace changes in nude body mass quantified fluid balance. RESULTS: Environmental wet bulb globe temperature averaged 26.5 degrees C. All runners finished the race asymptomatic of heat illness in a mean +/- SD (range) time of 118 +/- 13 (105-146) min, corresponding to an average running speed of 10.8 +/- 1.1 (8.6-12.0) km.h(-1). All runners recorded peak T(c) > 39 degrees C; 56% (N = 10) > 40 degrees C; and 11% (N = 2) > 41 degrees C. Peak T(c) was 40.1 +/- 0.7 (39.3-41.7) degrees C at 86 +/- 36 (13-130) min, with T(c) 39.9 +/- 0.8 (38.3-41.7) degrees C at race finish. The magnitude of T(c) response was unrelated (P > 0.05) to running time or fluid balance (e.g., fluid intake, % dehydration). Cumulative heat strain index was 2790 +/- 1112 (1046-5144) units at race finish. CONCLUSION: Ingestible telemetric temperature sensors demonstrated utility for continuous measurement of T(c) during mass-participation running. Successful application of this technology has highlighted the magnitude and duration of T(c) elevation that runners will voluntarily achieve during mass-participation distance races in heat and high humidity without medical consequence.

Body Temperature Regulation↗
PubMed2001

Opposite regulation of body temperature by cholinergic input to the paraventricular nucleus and supraoptic nucleus in rats.

Hypothalamic cholinergic system plays an important role in the regulation of body temperature and fluid balance. We have previously shown that cholinergic stimulation of the anterior hypothalamus and preoptic area was accompanied by a fall in body temperature, increased water intake, and increased Fos protein in the paraventricular nucleus (PVN) and supraoptic nucleus (SON). In the present study, to estimate the role played by cholinergic input to the PVN and SON in thermoregulation and water intake, we used microdialysis for cholinergic stimulation with neostigmine and analysis of the nucleus, and also investigated immunoreactivity for c-Fos protein in the brain. This stimulation increased extracellular concentration of acetylcholine in these nuclei. Stimulation of the PVN decreased body temperature and increased water intake. On the other hand, stimulation of the SON increased body temperature. Both in PVN-stimulated and SON-stimulated rats, c-Fos-like immunoreactivity (Fos-IR) was evident in the PVN, SON and certain regions including locus coeruleus (LC), area postrema and nucleus of the solitary tract (NTS). Addition of atropine to the dialysis medium attenuated the increase of Fos-IR and suppressed the cholinergic stimulation-induced responses in body temperature and water intake. These results suggest that cholinergic muscarinic mechanisms in PVN and SON play an opposite function in the regulation of body temperature. The same neuronal pathway including LC and NTS may participate in an advance both in hypothermia and in hyperthermia.

Acetylcholine↗