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Shiftwork in the hot environment.

P K Nag1, A Nag

  • 1National Institute of Occupational Health (I.C.M.R), Ahmedabad, India.

Journal of Human Ergology
|October 21, 2003
PubMed
Summary
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Night shift workers in the textile industry face higher risks of heat-induced accidents due to lower heat tolerance. This study highlights the critical impact of environmental heat on workplace safety and worker vulnerability.

Area of Science:

  • Occupational Health
  • Environmental Physiology
  • Industrial Safety

Background:

  • High ambient temperatures pose significant risks for workplace accidents, particularly in industries like textiles.
  • Understanding heat tolerance across different work shifts is crucial for preventing heat-related injuries.

Purpose of the Study:

  • To investigate the prevalence of heat-induced workplace accidents in the textile industry.
  • To compare the heat tolerability of rotating day shift and permanent night shift workers under varying hot climatic conditions.

Main Methods:

  • A longitudinal study involving 4125 textile industry workers.
  • Assessment of accident prevalence during hot summer months (42-48°C).
  • Evaluation of heat tolerance in rotating day (N=16) and night shift (N=13) workers across hot-dry and hot-humid environments (31-49°C).

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Main Results:

  • Accident prevalence was significantly higher during summer months with high ambient temperatures.
  • Night shift workers exhibited approximately 15-40% lower heat tolerance compared to rotating day workers.
  • Segmental and compartmental temperatures critically influenced heat dissipation and accumulation, affecting worker tolerance.

Conclusions:

  • Night shift work exacerbates vulnerability to heat stress and increases the risk of workplace accidents in hot environments.
  • Shift work scheduling and environmental heat management are critical factors for ensuring textile worker safety.
  • Individual physiological responses to heat, influenced by body temperature regulation, play a key role in determining heat tolerance.