Hot or Cold Beverages in Warm Weather

Herlev Hospital

Status: Completed

Conditions: Quality of Life

Treatments: Dietary Supplement: Tea

Study type: Interventional

Funder types: Other

Identifiers

NCT05900960

F-23023485

Details and patient eligibility

About

Some studies have suggested that hot beverages are better for cooling down when body temperature rises. No study has investigated the effect of hot beverages in hot weather on personal well-being compared to cold beverages.

Full description

The research project will be conducted as a double-blinded randomized crossover trial, where the participants will drink either 10 cl of 10°C cold tea (±2°C) or 50°C hot tea (±2°C), which in a pilot study and in the literature [1,9] has been shown to be without discomfort or side effects. The order of the two interventions will be randomized.

All participants must be adults (18 years or older) and not have a fever on the day of the experiment.

Prior to participation, participants must provide written informed consent and must show up in clothing they find comfortable in the sun and be wearing sunscreen and a sun hat/cap. Participants must also complete a questionnaire on basic background information: gender, age, height, weight, clothing during the trial, and the participant's preference regarding the climate and temperature of beverages.

Walk-through of study:

1. Participants lie or sit in the sun for 10 minutes without drinking anything.
2. Then, participants drink their allocated beverage in ≤ 5 sec. while still in the sun.
3. Approximately 3 minutes (±1 min.) after ingestion of the beverage intervention, participants must answer all questionnaires and have their temperature measured.
4. Afterward, participants stay in the shade for 5 minutes (wash-out period).
5. Participants lie down (or sit) in the sun for the second time for 10 minutes without drinking anything.
6. Then, participants drink their second allocated beverage in ≤ 5 sec. while still in the sun.
7. Approximately 3 minutes (±1 min.) after ingestion of the second beverage intervention, participants must again answer all questionnaires and have their temperature measured.
8. Data collection and the research project end thereafter

Enrollment: 30 patients

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• 18 years or older
• Must be able to ingest intervention
• Must be able to be in the sun for 2x 13 minutes (using sunscreen and/or other relevant UV protection).

Exclusion criteria

• Fever on the day of the experiment.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Triple Blind

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30 participants in 2 patient groups

Warm tea

Experimental group

Description:

50 degrees celsius hot tea.

Treatment:

Dietary Supplement: Tea

Cool tea

Active Comparator group

Description:

10 degrees celsius cool tea

Treatment:

Dietary Supplement: Tea