Hot or Cold Beverages in Warm Weather

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

30 participants

Study Classification

INTERVENTIONAL

Study Start Date

2023-05-09

Study Completion Date

2023-05-10

Brief Summary

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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.

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Detailed Description

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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

Conditions

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Quality of Life

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

TREATMENT

Blinding Strategy

TRIPLE

Participants Investigators Outcome Assessors

Study Groups

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Warm tea

50 degrees celsius hot tea.

Group Type EXPERIMENTAL

Tea

Intervention Type DIETARY_SUPPLEMENT

Orally administered. Decaffeinated tea, with no additives (sugar, honey, etc.)

Cool tea

10 degrees celsius cool tea

Group Type ACTIVE_COMPARATOR

Tea

Intervention Type DIETARY_SUPPLEMENT

Orally administered. Decaffeinated tea, with no additives (sugar, honey, etc.)

Interventions

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Tea

Orally administered. Decaffeinated tea, with no additives (sugar, honey, etc.)

Intervention Type DIETARY_SUPPLEMENT

Eligibility Criteria

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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).