Effectiveness of rehydration with green tea on recovery from dehydration

Effect of fluid replacement with green tea on body fluid balance and renal responses under mild thermal hypohydration

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN53057185

Enrollment

Registered

2023-04-12

Start date

2020-02-01

Completion date

Unknown

Last updated

2023-09-04

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Hydration status monitoring Not Applicable

Interventions

After baseline measurement, subjects were dehydrated by performing four bouts of stepping exercise for 20 min separated by 10 min of rest. They were asked to ingest an amount of water (H2O), GT, or ca

Caf-H2O) that was equal to the volume of fluid loss during the dehydration protocol

fluid balance was measured for 2 h after fluid ingestion. Randomization was performed using randomization.com.

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1. Healthy young male and female volunteers 2. Age >20 years 3. BMI 18-25 kg/m² 4. No known cardiovascular, renal or metabolic disease

Exclusion criteria

Exclusion criteria: 1. Overweight or obese (BMI >25 kg/m²) 2. Current or former cardiovascular, renal or metabolic disease 3. Currently taking prescribed medication

Design outcomes

Primary

Measure	Time frame
1. Fluid balance is calculated from the change in body weight measured with an electric balance for 2 hours of the dehydration period and 2 hours after the ingestion of fluids. Body weight measurements are performed at baseline, immediately after the dehydration period, 0.5, 1 and 2 hours after fluid ingestion. 2. Fluid retention ratio at 2 hours after fluid ingestion calculated from the ingested fluid weight and retained fluid calculated body weight change	—

Measure

Time frame

1. Fluid balance is calculated from the change in body weight measured with an electric balance for 2 hours of the dehydration period and 2 hours after the ingestion of fluids. Body weight measurements are performed at baseline, immediately after the dehydration period, 0.5, 1 and 2 hours after fluid ingestion. 2. Fluid retention ratio at 2 hours after fluid ingestion calculated from the ingested fluid weight and retained fluid calculated body weight change

—

Secondary

Measure	Time frame
1. Urinary flow rate calculated from the weight of sampled urine, in which subjects were asked to empty the urinary bladder, and the time between sampling. Urine collections are made at baseline, immediately after the dehydration protocol, and 0.5, 1, and 2 hours after fluid ingestion. 2. Urinary excretion rate of osmotically active substances, sodium, potassium, and chloride, calculated from the urine flow rate and urine osmolality (osmometer), sodium, potassium, and chloride (ion-selective electrodes). Urine collections are made at baseline, immediately after the dehydration protocol, and 0.5, 1, and 2 hours after fluid ingestion.	—

Measure

Time frame

1. Urinary flow rate calculated from the weight of sampled urine, in which subjects were asked to empty the urinary bladder, and the time between sampling. Urine collections are made at baseline, immediately after the dehydration protocol, and 0.5, 1, and 2 hours after fluid ingestion. 2. Urinary excretion rate of osmotically active substances, sodium, potassium, and chloride, calculated from the urine flow rate and urine osmolality (osmometer), sodium, potassium, and chloride (ion-selective electrodes). Urine collections are made at baseline, immediately after the dehydration protocol, and 0.5, 1, and 2 hours after fluid ingestion.

—

Countries

Japan

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 10, 2026