Ignite Creation Date:
2024-10-26 @ 3:42 PM
Last Modification Date:
2024-10-26 @ 3:42 PM
Study NCT ID:
NCT06630832
Status:
RECRUITING
Last Update Posted:
None
First Post:
2024-10-04
Brief Title:
Initial Stay Times and Heat Mitigation Controls for Uncompensable Occupational Heat Stress - Part III
Sponsor:
None
Organization:
None
Study Overview
Official Title:
Impact of Partial and Full Cooling Applied During Prescribed Rest Breaks to Mitigate Increases in Physiological Strain During Prolonged Work in Hot Environments
Status:
RECRUITING
Status Verified Date:
2024-10
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
No
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
Occupational heat stress directly threatens workers ability to live healthy and productive lives Heat exposed workers are at an elevated risk of experiencing impaired work performance and cognitive function leading to a greater risk of work-related injuries which includes traumatic injury and a myriad of pathophysiological conditions eg heat stroke acute kidney injury adverse cardiovascular events To mitigate the adverse health effects of occupational heat stress safety organizations recommend upper limits for heat stress typically defined by a workers metabolic rate and the prevailing wet-bulb globe temperature WBGT In instances where the heat load created by the combination of work intensity environment and clothing worn exceed the upper heat stress limits uncompensable heat stress controls such as rest breaks are prescribed to limit increases in core temperature beyond recommended limits While workers are encouraged to find shelter from the heat during a rest break it is not always possible or feasible Typically workers may rest while remaining exposed to the heat recover in a shaded area or rest in an air-conditioned room or vehicle However the effectiveness of these cooling strategies in mitigating the level of physiological strain experienced by the worker during prolonged work in a hot environment remains unclear In this project the investigators will assess the efficacy of the different cooling strategies in preventing excursions in core temperature beyond recommended limits 380C following the initial stay time for moderate-intensity work in hot ambient conditions WBGT of 29C represents hot outdoor conditions experienced by workers in summers in Ontario Canada in context of the prescribed American Conference of Governmental Industrial Hygienists ACGIH work-to-rest allocation for unacclimated adults On three separate days participants will walk on a treadmill at a fixed metabolic rate of 200 Wm2 until core temperature reaches andor exceeds 380C or until volitional fatigue Thereafter participants will complete an additional 180 min work bout employing the recommended ACGIH work-to-rest allocation of 13 starting with a 45 min rest break followed by a 15 min work bout with the cycle repeated three times over the 180 min work simulation bout without Control or with cooling mitigation during each 15-min break consisting of either i partial cooling equivalent to sitting in a shaded space WBGT 24C 317C and 35 RH such as under a tree with a light breeze simulated with pedestal fan fixed at 2 ms or ii full cooling equivalent to sitting in air-conditioned space eg room or vehicle maintained at 22C and 35 RH equivalent WBGT of 16C
Detailed Description:
None
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
None
Is a FDA Regulated Device?:
None
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None