Impact of a simulated multiday heatwave on nocturnal physiology, behavior, and sleep

Impact of a simulated multiday heatwave on nocturnal physiology, behavior, and sleep: A 10-day confinement study

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN67760213

Enrollment

Registered

2024-05-27

Start date

2020-10-21

Completion date

Unknown

Last updated

2024-07-29

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

Conditions

Impact of a simulated heatwave on physiology, behavior, and sleep. Not Applicable

Interventions

This study will monitor physiological and behavioral responses to a 3-day heatwave throughout the day and over ten days. During this period, three days (days 5 to 7) are dedicated to a heatwave (day:

night: 26.3 °C) simulation, while days 1 to 4 and 8 to 10 are thermally neutral (day: 25.4 °C

night: 22.3 °C).

Eligibility

Sex/Gender

Male

Inclusion criteria

Inclusion criteria: 1. Non-heat acclimatized 2. Healthy, young males 3. Without a history of sleep disorders or medication use

Exclusion criteria

Exclusion criteria: 1. Unhealthy 2. Non-adult

Design outcomes

Primary

Measure	Time frame
1. Core body temperature measured using telemetric pills continuously 2. Skin temperature from four sites measured using iButtons continuously 3. Heart rate measured using heart rate monitors continuously 4. Sleep quality measured using a partial polysomnography device continuously 5. Sleep thermoregulatory behavior measured using photographs taken once per night, and with a questionnaire once per day 6. Dehydration measured using urine-specific gravity once per day	—

Measure

Time frame

1. Core body temperature measured using telemetric pills continuously 2. Skin temperature from four sites measured using iButtons continuously 3. Heart rate measured using heart rate monitors continuously 4. Sleep quality measured using a partial polysomnography device continuously 5. Sleep thermoregulatory behavior measured using photographs taken once per night, and with a questionnaire once per day 6. Dehydration measured using urine-specific gravity once per day

—

Secondary

Measure	Time frame
There are no secondary outcome measures	—

Countries

Slovenia

Contacts

Public ContactLeonidas Ioannou

leonidas.ioannou@ijs.si+306949963364

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026