1. 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

2. 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

3. 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

4. Core Temperature Sensor Calibration

5. Calibration

6. Preparation Session of Treadmill Running

7. Treadmill Running

8. After Treadmill Running Control Wearing Korean cooling vest

9. Summary of 1 st lab test results

10. 30min resting Core temperature 37.65  37.66 o C Heart rate 79  91.6 bpm

11. 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

12. 1 st 30min recovery (without cooling vest) Core temperature 38.5  38.11 o C Heart rate 180.7  112.2 bpm

13. 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

14. 2 nd 30min recovery (with cooling vest) Core temperature 38.5  37.96 o C Heart rate 173.4  106.1 bpm

15. Comparison after normalization of 1 st running trial 37.66 38.11  38.5 o C

16. Comparison during running DurationTotal distance Without cooling vest12min 11sec1866m With cooling vest32min 20sec4050m 38.11  38.5 o C

17. Comparison during running DurationTotal distance Without cooling vest12min 11sec1866m With cooling vest32min 20sec4050m 180.7 bpm 173.4 bpm

18. 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

19. 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

20. 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)

21. Productivity Calculated using the formula  different results  ask Rey to check

22. 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

23. PSI (con’t)

24. Discussion for some issues

25. Data frequency

31. 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?

32. 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 ?

33. Thanks