Hydration status monitoring Not Applicable
Conditions
Interventions
After baseline samples were collected, each participant consumed 1L of fluid over a 30-minute period (4 x 250 ml delivered at 7.5-min intervals) and hydration status was monitored at hourly intervals
Tesco, Hertfordshire, UK) or skimmed milk (0.1% fat
Tesco, Hertfordshire, UK). We obtained n=72 observations for water, and n=17 observations for each of the other test drinks.
Sponsors
University of Stirling (UK)
Bangor University (UK)
Loughborough University (UK)
Eligibility
Sex/Gender
Male
Inclusion criteria
Inclusion criteria: 1. Healthy male volunteers 2. Aged 18-35 3. BMI 18-27 kg/m2 4. No known cardiovascular, renal or metabolic disease 5. Moderately active 6. Moderate alcohol use
Exclusion criteria
Exclusion criteria: 1. Overweight or obese (BMI >27 kg/m2) 2. Competitive athletes during competition season 3. Current or former cardiovascular, renal or metabolic disease 4. Habitual consumption of alcohol (>21 units/week) or regular (>1/week) high (10 units) intake 5. History of psychiatric illness 6. Actively seeking to gain or lose weight 7. Currently taking prescribed medication
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| 1. Net fluid balance over each hour for 4 hours (fluid ingested minus cumulative urine output) 2. Hydration Index at each hour over 4 hours (net fluid balance comparison to water as a control) | — |
Secondary
| Measure | Time frame |
|---|---|
| 1. Urine and serum osmolality at baseline and at each hour following fluid ingestion for 4 hours (freezing point depression method within 48 hours of sample collection) 2. Sodium and potassium net balance assessed immediately post-drinking and each hour following fluid ingestion for 4 hours (flame photometry method within 5 days of sample collection) | — |
Countries
United Kingdom
Outcome results
None listed