INTRODUCTION

Heat stress poses a recognized threat to human health. Despite growing evidence, its impact on healthcare workers (HCWs) remains underexplored. This study evaluates occupational heat stress in HCWs, assessing physiological responses and subjective well-being.

METHODS

Twelve HCWs from a German university hospital were monitored in non-air-conditioned intensive care units (ICU) and non-ICU settings during the summer of 2022 (mean indoor temperature of 26.5 °C) and again in the autumn of the same year or in March 2023 (mean indoor temperature of 23.6 °C). Physiological data (core body temperature, heart rate, and skin temperature) and subjective perceptions were measured using wearable sensors and questionnaires.

RESULTS

In summer, mean core body and skin temperatures were higher by 0.4 °C and 0.3 °C, respectively. ICU workers exhibited higher heart rates and reported greater mental demands, frustration, and discomfort, particularly when using personal protective equipment (PPE). Common symptoms included sweating, fatigue, and headaches.

CONCLUSION

We observed some evidence suggesting that elevated indoor temperatures and reported PPE usage contribute to increased HCWs' heat strain, which could potentially affect health, safety, and performance. Given the observed trends, we recommend considering cooling vests and revising workplace standards to mitigate heat stress.