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Initial Stay Times and Heat Mitigation Controls for Uncompensable Occupational Heat Stress - Part II

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University of Ottawa

Status

Enrolling

Conditions

Heat Fatigue
Core Temperature
Exercise
Heat Stress, Exertional

Treatments

Other: Simulated work in the heat

Study type

Interventional

Funder types

Other

Identifiers

NCT06543719
HEPRU-2024-07

Details and patient eligibility

About

Workplaces rely on upper heat stress limits provided by the American Conference of Governmental Industrial Hygienists (ACGIH) to manage the health and safety of workers in hot environments. This is primarily achieved by interspersing work with rest periods, the length of which is dictated by environmental conditions and work intensity, to maintain core temperature at or below 38.0°C (equivalent to a 1°C increase in body core temperature above resting levels). However, these guidelines employ a "one size fits all" approach to exposure limits that does not consider individual variation (e.g., age) between workers. Moreover, they fail to provide direction on the safe, initial stay times before these heat-mitigation controls should be employed (i.e., rest breaks) in conditions exceeding upper heat stress limits. While recent work has generated estimates of the initial stay times for young to older men before heat-mitigation controls are required for moderate-intensity work, information on initial stay times for heavy-intensity work remains to be assessed. This project will assess the initial stay times for heavy-intensity work for a single work bout as well as for a second work bout that is preceded by an extended rest period such as a lunch break and a work bout performed on the next day to determine if refinements in initial stay times across these periods may be required. Further, the investigators will evaluate if the application of recommended work-rest allocations thereafter would alleviate increases in core temperature for the duration of the work period (e.g., start of shift versus post-lunch period). Given the known age-differences in heat loss that can modulate core temperature regulation during an exercise-heat stress, the investigators will assess responses response in young and older adults.

Enrollment

20 estimated patients

Sex

Male

Ages

18 to 69 years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria

  • young (18-30 years) and older adults (50-69 years)
  • habitually active, not endurance trained (<2 sessions per week, <150 minutes per week)
  • non-smoking
  • English or French speaking
  • ability to provide informed consent

Exclusion criteria

  • pre-existing health conditions (e.g., diabetes, hypertension)
  • use of medication deemed to significantly modulate thermoregulatory function and heat tolerance (e.g., antidepressants, antihistamines, diuretics)
  • engaged in jobs and/or activities that involve frequent exposure to hot environments (e.g., regular sauna use)

Trial design

Primary purpose

Basic Science

Allocation

Non-Randomized

Interventional model

Parallel Assignment

Masking

Single Blind

20 participants in 2 patient groups

Younger adults.
Experimental group
Description:
Adults aged 18-30 years with no pre-existing health conditions
Treatment:
Other: Simulated work in the heat
Older adults. Adults aged 50-69 with no pre-existing health conditions
Experimental group
Description:
Adults aged 50-69 with no pre-existing health conditions
Treatment:
Other: Simulated work in the heat

Trial contacts and locations

1

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Central trial contact

Glen P Kenny, PhD

Data sourced from clinicaltrials.gov

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