Physiological responses to heat strain: A study on personal monitoring for young workers

Heart rate, increased body-core temperature and sweating are the physiological responses to heat stress and they are collectively known as physiological strain. Our goal was to study levels of physiological strain in young farm workers aged 15–21 y. We also verified that heart rate is the response that exceeds threshold limits earliest as seen in previous studies. Personal monitoring for heat-strain measures directly physiological strain as it occurs and gives further information about each worker's state. When estimating levels of physiological strain, certain limits concerning heart rate were adjusted considering the young ages of the workers studied.