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Study on the effectiveness of personal cooling equipment for protecting workers from heat stroke while working in a hot environment 1 st lab test 5 Dec, 2012 Del P. WONG, Guo Yueping, Jackio Yang Report 15
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OSHC Lab test protocol (29 November 2012) TimeDurationTaskRemark >8hrs from the test Ingest the coreTemp pill --Colleagues arrive the lab 30minEquipment preparationTurn on the chamber and set at 30 o C and 75% relative humidity --Participant arrives the lab 15minExplanation of study to the participant 30minProvide breakfast/snacks 30min1.Basic personal/demographic information 2.Baseline physiological measurements 3.Rest Apply and collect physiological data such as core temperature and heart rate. 30minParticipant adaptation1.No cooling 2.Inside the chamber 3.Sit and rest on a backless chair ~30min1 st self-paced running - Participant can adjust the running speed by themselves - Initial running speed = 7km/h, 1% incline - At all times participant has control of the treadmill speed but the treadmill display was masked 1.No cooling 2.Real-time measure of core temperature, skin temperature, and heart rate. 3.Record the time spent, running speed and distance covered. 4.Stop running when core temperature =38.5 o C 30min1 st recovery1.No cooling 2.Sit and rest on a backless chair 3.Real-time measure of core temperature and heart rate. ~30min2 nd self-paced running - Participant can adjust the running speed by themselves - Initial running speed = 7km/h, 1% incline - At all times participant has control of the treadmill speed but the treadmill display was masked 1.With cooling vast 2.Real-time measure of core temperature and heart rate. 3.Record the time spent, running speed and distance covered. 4.Stop running when core temperature =38.5 o C 30min2 nd recovery1.With cooling vast 2.Sit and rest on a backless chair 3.Real-time measure of core temperature and heart rate. Done
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Climatic chamber Treadmill and data monitor Treadmill panel (speed display was masked) Real-time data record Chamber: 30 o C, 75% RH Heat stress monitor Temp and humid monitor inside chamber Equipment
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Core Temperature Sensor Calibration
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Calibration
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Preparation Session of Treadmill Running
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Treadmill Running
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After Treadmill Running Control Wearing Korean cooling vest
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Summary of 1 st lab test results
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30min resting Core temperature 37.65 37.66 o C Heart rate 79 91.6 bpm
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1 st running (without cooling vest) Core temperature 37.66 38.5 o C Heart rate 91.6 180.7 bpm Duration: 26min 23secTotal distance: 4082mAverage power: 136.3W
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1 st 30min recovery (without cooling vest) Core temperature 38.5 38.11 o C Heart rate 180.7 112.2 bpm
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2 nd running (with cooling vest) Core temperature 38.11 38.5 o C Heart rate 112.2 173.4 bpm Duration: 32min 20secTotal distance: 4050mAverage power: 110.3W
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2 nd 30min recovery (with cooling vest) Core temperature 38.5 37.96 o C Heart rate 173.4 106.1 bpm
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Comparison after normalization of 1 st running trial 37.66 38.11 38.5 o C
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Comparison during running DurationTotal distance Without cooling vest12min 11sec1866m With cooling vest32min 20sec4050m 38.11 38.5 o C
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Comparison during running DurationTotal distance Without cooling vest12min 11sec1866m With cooling vest32min 20sec4050m 180.7 bpm 173.4 bpm
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Comparison during recovery DurationDecrease in Core Temp Without cooling vest30min0.39 o C With cooling vest30min0.54 o C 38.11 o C Pre-running 37.66 o C
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Comparison during recovery DurationDecrease in Heart Rate Without cooling vest30min68.5bpm With cooling vest30min67.3bpm 180.7bpm 112.2bpm 173.4bpm 106.1bpm Pre-running 91.6bpm
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Index Mean values ± SD Range Natural wet bulb temperature ( ℃ )26.09 ± 0.47 24.14 ~ 26.90 Dry bulb temperature ( ℃ )28.85 ± 0.48 25.01 ~ 29.76 Globe thermometer temperature ( ℃ )29.48 ± 0.80 26.01 ~ 30.24 Relative humidity (%) 80.67 ± 3.82 74.00 ~ 89.00 Wet bulb globe temperature index (In) ( ℃ )27.08 ± 0.59 24.49 ~ 27.78 Wet bulb globe temperature index (Out) ( ℃ ) 27.09 ± 0.49 25.13 ~ 27.72 Heat index 35.44 ± 1.23 30.50 ~ 37.5 Wind speed in meter per second (m/s)0.32 ± 0.090.13 ~ 0.47 Environmental Data (Chamber)
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Productivity Calculated using the formula different results ask Rey to check
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PSI Real time 19:43:02- 20:08:02 Rest (30 min)* buffering time 20:12-50- 20:39:13 1 st Running (26 min 23 sec) 20:39:13- 21:09:13 1 st Recovery (30 min) buffering time 21:10:42- 21:43:02 2 nd Running (32 min 20 sec) 21:43:02-22:13:02 2 nd Recovery (30 min) HR # 91.6 180.7112.2 173.4106.1 Tc # 37.66 38.5 38.11 (0.39 decrease) 38.537.96 (0.54 decrease) PSI 0 7.3222.388 6.9091.635 #:the average of the last 1min. *: The data are available for only 25 min. Using Del’s data (1 st lab test report & HR-Tc Syned) [ignored the abnormal data] Formula: PSI=5*(HRi-HR0)/(180-HR0)+5*(Tci-Tc0)/(39.5-Tc0) where HR0 and Tc0 are the resting values (the average at ) in the chamber prior to the exercise. HR0=91.6 bmp, Tc0=37.66 oC
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PSI (con’t)
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Discussion for some issues
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Data frequency
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Sweat rate Failed to calculating Sweat rate Time sequence Parameters in the formula Pre-exercise nude body weight (kg)Post-exercise nude body weight (kg) Fluid intake during exercise (ml) Urine volume during exercise (ml) Exercise time (mi) Parameters in chamber test FoodFluidClothingPre-exercise body weight FluidPost-exercise body weight --Exercise time (mi) Stage 1bread240 ml0.32 kg57.66 kgwater57.42 kg--26.38 Stage 2-waterNew clothes but wet shorts 57.66 kgwater57.45 kg--32.33 Wet shorts? Is it necessary to change a new uniform ? Is it necessary to weigh the body weight first and then drink water?
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Further issues 1. How to detect 38.5 oC? (By Mr. I.K.) 2. The interval of CorTemp To change another monitor 3. 30 min for rest Clock ?
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Thanks
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