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Heat stress assessment among workers in a Nicaraguan sugarcane farm
1Occupational Health and Safety, Holcim, Nicaragua, S.A.
Background:
Heat illness is a major cause of preventable morbidity worldwide. Workers exposed to intense heat can become unable to activate compensation mechanisms, putting their health at risk. Heat stress also has a direct impact on production by causing poor task performance and it increases the possibility of work-related morbidity and injuries. During the sugarcane harvest period, workers are exposed to excessive sunlight and heat from approximately 6 am to 3 pm. A first assessment of heat stress during the 2006/2007 harvesting season served to redesign the existing rehydration measures. In this project, sugarcane workers were provided with more rehydration solutions and water during their work schedule.
Objective:
To assess heat stress preventive measures in order to improve existing rehydration strategies as a means of increasing productivity.
Methods:
A small group of 22 workers were followed up for 15 days during working hours, from 6 am to 3 pm. Selection criteria were defined: to have worked more than 50% of the day's working schedule and to have worked for at least 10 days of the follow-up period. A simple data recollection sheet was used. Information regarding the amount of liquid intake was registered. Production output data was also registered. Temperature measurements were recorded by using a portable temperature monitoring device ('EasyLog', model EL-USB-2).
Results:
The average temperature measurements were above the Nicaraguan Ministry of Labour thresholds. Seven workers drank 7-8 L of liquid, improving their production. Output production increased significantly (p=0.005) among those best hydrated, from 5.5 to 8 tons of cut sugarcane per worker per day.
Conclusions:
Productivity improved with the new rehydration measures. Awareness among workers concerning heat stress prevention was increased.
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