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' HEAT STRESS <br /> Monitoring of personnel wearing impervious clothing and respirators will begin when the ambient <br /> temperature is 70 degree Fahrenheit or above Frequency of monitoring will increase as the ambient <br /> ' temperature increases or as the rate of worker recovery slows When temperatures exceed 85°F, <br /> workers should be monitored for heat stress after every work period The following techniques will <br /> ' be used to monitor workers' ability to recover from excess heat <br /> The heart rate (HR) will be measured by the radial pulse for 30 seconds as early as possible in the <br /> resting period The HR at the beginning of the rest period should not exceed 110 beats per minute <br /> ' If the HR is higher, the next work period will be shortened by 33 percent while the rest period <br /> remains the same If the HR is 100 beats per minute at the beginning of the next rest period, the <br /> ' following work cycle should be shortened by 33 percent <br /> Oral temperature should be measured using a clinical thermometer (3 minutes under the tongue) <br /> or similar device to measure the oral temperature at the end of the work period (before drinking) If <br /> oral temperature exceeds 99 6°F (37 6 degree Celsius) at the beginning of the rest period, the <br /> following work cycle will be shortened by 33 percent A worker will not be permitted to wear a <br /> semipermeable or impermeable garment when his/her oral temperature exceeds 100 6°F (38 1 degree <br /> celsius) <br /> Body-water loss will be measured when possible Each worker's weight will be measured on a <br /> scale accurate to ±0 25 lb at the beginning and end of each work day to see if enough fluids are <br /> ' being taken to prevent dehydration Weights should be taken while the worker wears similar clothing <br /> or, ideally, is nude The body-water loss in one work day should not exceed 1 S percent of total <br /> ibody weight <br /> ' In addition to the above, physical reactions will be noted For example, flushed skin or the lack <br /> of sweating should be noted Fatigue, flushed skin, decreased concentration and movement, <br /> ' lightheadedness, nausea, and loss of manual dexterity are all possible physical reactions to excess <br /> heat Standard reference books (e g , Red Cross First Aid Manual) can be consulted for specific <br /> ' treatment <br /> K - 1 <br />