Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Hot Weather Concreting

Hot Weather Concreting

Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...

Masonry in Cold and Hot Weather Conditions

Masonry in Cold and Hot Weather Conditions

In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units...

Design Example: Managing Concrete Workability

Design Example: Managing Concrete Workability

This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.

Factors Affecting Body Temperature

Factors Affecting Body Temperature

As a nurse, it is vital to understand the factors affecting body temperature to monitor variations and effectively evaluate deviations from regular.
Factors may include:

Responses to Heat and Cold Stress

Responses to Heat and Cold Stress

Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.

Requirements for Human Life

Requirements for Human Life

The Earth and its atmosphere have provided humans with air, water, and food, but these are not the only requirements for survival. Humans also require a specific range of temperature and pressure that the Earth and its atmosphere provides.
Oxygen
Atmospheric air is only about 20 percent oxygen, but that oxygen is a key component of the chemical reactions that keep the body alive, including the reactions that produce ATP. Brain cells are susceptible to a lack of oxygen because they require a...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Heat vulnerability across the lifespan during prolonged heat exposure.

Journal of applied physiology (Bethesda, Md. : 1985)·2026

Same author

Phase-dependent autonomic responses to electric fan use during a prolonged 8-h heat exposure in older adults.

American journal of physiology. Regulatory, integrative and comparative physiology·2026

Same author

The impacts of common chronic disease on autophagy and cellular stress during exertional heat stress in peripheral blood mononuclear cells of older males.

American journal of physiology. Regulatory, integrative and comparative physiology·2026

Same author

Accuracy of next-generation wireless skin temperature sensors during exercise-heat stress.

Experimental physiology·2026

Same author

Heat and mental health outcomes: Towards an inclusive evidence base to inform Australian practice and policy.

Australasian psychiatry : bulletin of Royal Australian and New Zealand College of Psychiatrists·2026

Same author

Assessment of Initial Stay Time and Work-Rest Scheduling Over Consecutive Moderate-Intensity Workdays in Hot Environments in Young and Older Males and Females.

American journal of industrial medicine·2026

Search research articles

Related Experiment Video

Updated: Sep 9, 2025

A Preclinical Model of Exertional Heat Stroke in Mice

A Preclinical Model of Exertional Heat Stroke in Mice

Published on: July 1, 2021

Defining Sex- and Age-Specific Initial Stay Times for Continuous Moderate-Intensity Work in Hot Environments Before

Fergus K O'Connor^1,2, Kristina-Marie T Janetos¹, Brodie J Richards¹

¹Human and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada.

American Journal of Industrial Medicine

|September 3, 2025

Summary

Older females are more susceptible to heat stress, with shorter initial stay times (IST) during work in hot conditions. This highlights the need for tailored heat exposure guidelines considering age and sex for worker safety.

Keywords:

age heat loss occupational heat stress sex thermoregulation

More Related Videos

A Rapidly Incremented Tethered-Swimming Maximal Protocol for Cardiorespiratory Assessment of Swimmers

A Rapidly Incremented Tethered-Swimming Maximal Protocol for Cardiorespiratory Assessment of Swimmers

Published on: January 28, 2020

Using an Ingestible Telemetric Temperature Pill to Assess Gastrointestinal Temperature During Exercise

Using an Ingestible Telemetric Temperature Pill to Assess Gastrointestinal Temperature During Exercise

Published on: October 7, 2015

Related Experiment Videos

Last Updated: Sep 9, 2025

A Preclinical Model of Exertional Heat Stroke in Mice

A Preclinical Model of Exertional Heat Stroke in Mice

Published on: July 1, 2021

A Rapidly Incremented Tethered-Swimming Maximal Protocol for Cardiorespiratory Assessment of Swimmers

A Rapidly Incremented Tethered-Swimming Maximal Protocol for Cardiorespiratory Assessment of Swimmers

Published on: January 28, 2020

Using an Ingestible Telemetric Temperature Pill to Assess Gastrointestinal Temperature During Exercise

Using an Ingestible Telemetric Temperature Pill to Assess Gastrointestinal Temperature During Exercise

Published on: October 7, 2015

Area of Science:

Occupational Health
Environmental Physiology
Thermoregulation

Background:

Industry guidelines recommend work-rest allocations to prevent excessive core temperature (Tcore) increases during heat exposure.
Current guidelines lack specified initial stay times (IST) and do not account for individual factors like sex and age.

Purpose of the Study:

To determine if sex and age influence the initial permissible work duration before exceeding heat stress thresholds.
To assess the impact of environmental conditions on IST.

Main Methods:

Examined permissible work duration until core temperature reached 38.0°C or increased by 1.0°C above resting.
Participants included young (18-30 years) and older (50-69 years) males and females.
Simulated moderate-intensity work (200 W/m²) under varying heat conditions (26°C, 29°C, 32°C WBGT).

Main Results:

Initial stay time (IST) significantly decreased as ambient temperature (WBGT) increased (p < 0.0001).
Older females showed a significantly higher likelihood of exceeding heat thresholds (Tcore ≥ 38.0°C or Δ1.0°C) compared to young males (p < 0.001).
IST for young females and older males were comparable to young males.

Conclusions:

Hotter ambient conditions significantly reduce IST.
Older females are particularly vulnerable to heat stress during moderate-intensity work.
Tailored occupational heat exposure guidelines are necessary, considering age and sex differences.