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The Annals of Occupational Hygiene
Year: 2011  |  Volume: 55  |  Issue: 5  |  Page No.: 548 - 555

Self-Pacing as a Protective Mechanism against the Effects of Heat Stress

Veronica Miller, Graham Bates, John D. Schneider and Jens Thomsen    

Abstract: Objective: Self-pacing or avoidance of physiological strain by adjustment of work rate may be an important protective behaviour for manual workers in severe thermal conditions. Data were gathered at a number of industrial sites in the United Arab Emirates to assess whether self-pacing takes place in these workers.

Methods: Heart rate and aural temperature were monitored in 150 subjects for 12 h daily over 2 consecutive days. Environmental parameters were measured for quantification of heat stress by the thermal work limit.

Results: There was no evidence of an effect of variation in environmental thermal stress on either average working heart rate or aural temperature.

Conclusion: These studies provide evidence that self-pacing is a protective response to working in heat which does not require a highly informed workforce; recognition of this should form part of a holistic approach to management of heat stress in hot climates.

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