View clinical trials related to Dehydration (Physiology).
Filter by:The primary purpose of the proposed study is to evaluate the effects of a topical sodium bicarbonate lotion (PR Lotion, AMP Human, Park City, UT) on measures of hydration status and fluid balance in humans when exposed to the heat while resting and during light/moderate aerobic exercise. A secondary purpose is to examine these same effects with two differing dosage patterns of the lotion. A tertiary purpose is to investigate the effect of an amino acid rehydration beverage in comparison to a placebo on measurements of hydration, subjective assessments of stress, and vestibular as well as musculoskeletal measures of fatigue for up to 24-hours after the completion of both passive and exertional heat stress within a dehydrated state.
Hydration is important to all individuals including occupational workers who complete physical activity in the heat. Current best practice guidelines suggest drinking a cup of water every 15-20 minutes during activity in a hot environment, but research shows this may not be ideal for best maintaining hydration. The goal of this study is to determine if larger, more frequent water boluses better maintain hydration than smaller, less frequent water boluses during moderate intensity physical activity in the heat.
The primary aim of this study is to assess cardiovascular changes (blood pressure, heart rate, electrocardiogram/ECG) in response to mild fluid-restriction dehydration and subsequent rehydration in healthy young and old people. Secondary aims are to assess changes in body composition, mood, and hunger in response to mild dehydration and rehydration.
There is a growing body of evidence suggesting low water intake and elevated levels of the hormone vasopressin exacerbate glucose regulation. This project will examine the physiological mechanism by which low water intake impairs glucose homeostasis. In the current proposal we aim to: 1) quantify the degree of glucose impairment as a response to elevated vasopressin due to low water intake and 2) identify the physiological mechanism by which elevated vasopressin, as a response to low water intake, impairs glucose regulation
The purpose of the study is to determine whether participants who are dictating their own administration of IV fluid boluses in response to thirst, receive better protection from hypovolaemia and volume overload than those who undergo routine fluid management. Thirst is prominent in critically ill patients and is related to dehydration. In a recent study of the symptoms experience in ITU patients at high risk of dying, the sensation of thirst was reported in 70.8% of assessments made and was considered to be one of the most intense stressors. Thirst and dehydration can be combated in an ITU setting by consuming oral fluids and through administration of intravenous fluids. However, in older adults, frailty and dysphagia reduces patients' capability to access fluid and results in thirst. In addition, the administration of IV fluids is determined by the attending physician and is often only re-evaluated on a daily or twice-daily basis. The Quench machine has been designed to allow the patient to have more control over their oral and IV fluid administration protocol. This may help reduce the sensation of thirst and dehydration in patients. The machinery is an automated fluid delivery system that will administer a given bolus of IV fluid in response to a trigger provided by the patient. The purpose of the current study is to examine the physiological basis for the functional benefit of this Quench system by investigating the effectiveness of the thirst response in healthy humans as a guide for administration of intravenous fluid boluses. To explore this, the investigators have designed a randomised, cross-over study. On one visit IV fluid boluses will be administered as per the participants' request in response to thirst. In the second arm of the study participants will be administered routine IV fluid maintenance as per NICE guidelines. Body mass at the end of a 4 hour fluid administration intervention will be our primary research outcome and will be compared between the two arms of the study. From this comparison the investigators hope to show that a patient would be able to accurately manage their level of hydration, both in terms of correcting dehydration and avoiding fluid overload. It is thought that avoiding states of fluid imbalance can reduce post surgical recovery times, reduce the incidence of post operative complications and avoid critical complications of fluid imbalance, such as acute kidney injury.