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
Dec 13, 2015
Study on the effectiveness of personal cooling equipment for
protecting workers from heat stroke while working in a hot environment
1st lab test
5 Dec, 2012Del P. WONG, Guo Yueping, Jackio Yang
Report 15
OSHC Lab test protocol (29 November 2012)
Time Duration Task Remark
>8hrs from the test
Ingest the coreTemp pill
-- Colleagues arrive the lab 30min Equipment preparation Turn on the chamber and set at 30oC and 75%
relative humidity -- Participant arrives the lab 15min Explanation of study to the participant 30min Provide breakfast/snacks 30min 1. Basic personal/demographic information
2. Baseline physiological measurements3. Rest
Apply and collect physiological data such as core temperature and heart rate.
30min Participant adaptation 1. No cooling 2. Inside the chamber3. Sit and rest on a backless chair
~30min 1st 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 oC
30min 1st recovery 1. No cooling2. Sit and rest on a backless chair3. Real-time measure of core temperature and
heart rate. ~30min 2nd 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 vast2. 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 oC
30min 2nd recovery 1. With cooling vast2. Sit and rest on a backless chair3. Real-time measure of core temperature and
heart rate. Done
Climatic chamber
Treadmill and data monitor
Treadmill panel (speed display was masked)
Real-time data record
Chamber: 30 oC, 75% RH
Heat stress monitor
Heat stress monitor
Temp and humid monitor inside chamber
EquipmentEquipment
CalibrationDate ID of subject Serial# Calibration# Name of subject ConditionCalibration 28 November #98 275237 41761348 Tang Wing Hung
Paper cup; (ml); 44oC water
5th trial about 30 minutes
Real time CorTemp (oC) Thermometer (oc) Difference20:14 41.69 43.19 1.520:15 42.15 42.7 0.5520:16 41.81 42.19 0.3820:17 41.35 41.71 0.3620:18 40.87 40.8 -0.0720:19 40.44 40.38 -0.0620:20 40.02 39.95 -0.0720:22 39.22 39.17 -0.0520:23 38.85 38.78 -0.0720:24 38.5 38.39 -0.1120:25 38.15 38.09 -0.0620:26 37.78 37.72 -0.0620:27 37.43 37.36 -0.0720:28 37.08 37.03 -0.0520:29 36.42 36.36 -0.0620:32 35.79 35.73 -0.0620:33 35.48 35.42 -0.0620:34 35.19 35.13 -0.0620:35 34.9 34.83 -0.0720:36 34.62 34.56 -0.0620:37 34.34 34.29 -0.0520:38 34.09 34.02 -0.0720:39 33.83 33.77 -0.0620:40 33.59 33.52 -0.0720:41 33.33 33.28 -0.0520:42 33.1 33.05 -0.0520:43 32.87 32.8 -0.0720:44 32.64 32.58 -0.0620:45 32.42 32.36 -0.0620:46 32.2 32.14 -0.0620:47 31.99 31.93 -0.0620:48 31.79 31.73 -0.0620:49 31.6 31.52 -0.0820:50 31.39 31.34 -0.0520:51 31.2 31.14 -0.0620:52 31.01 30.95 -0.0620:53 30.83 30.77 -0.0620:54 30.66 30.59 -0.0720:55 30.47 30.41 -0.0620:56 30.31 30.23 -0.0820:57 30.14 30.08 -0.0620:58 29.97 29.92 -0.05
1st running (without cooling vest)
Core temperature 37.66 38.5 oC
Heart rate91.6 180.7 bpm
Duration: 26min 23sec Total distance: 4082m Average power: 136.3W
2nd running (with cooling vest)
Core temperature 38.11 38.5 oC
Heart rate112.2 173.4 bpm
Duration: 32min 20sec Total distance: 4050m Average power: 110.3W
Comparison during runningDuration Total distance
Without cooling vest 12min 11sec 1866m
With cooling vest 32min 20sec 4050m
38.11 38.5oC
Comparison during runningDuration Total distance
Without cooling vest 12min 11sec 1866m
With cooling vest 32min 20sec 4050m
180.7 bpm
173.4 bpm
Comparison during recoveryDuration Decrease in Core Temp
Without cooling vest 30min 0.39oC
With cooling vest 30min 0.54oC
38.11oC
Pre-running 37.66oC
Comparison during recoveryDuration Decrease in Heart Rate
Without cooling vest 30min 68.5bpm
With cooling vest 30min 67.3bpm
180.7bpm
112.2bpm
173.4bpm
106.1bpm
Pre-running91.6bpm
Index Mean values ± SD RangeNatural wet bulb temperature (℃) 26.09 ± 0.47 24.14 ~ 26.90Dry bulb temperature (℃) 28.85 ± 0.48 25.01 ~ 29.76Globe thermometer temperature (℃) 29.48 ± 0.80 26.01 ~ 30.24Relative humidity (%) 80.67 ± 3.82 74.00 ~ 89.00Wet 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 ~ 37.5Wind speed in meter per second (m/s) 0.32 ± 0.09 0.13 ~ 0.47
Environmental Data (Chamber)
PSI
Real time
19:43:02- 20:08:02Rest (30 min)*
bufferingtime
20:12-50-20:39:13 1st Running (26 min 23 sec)
20:39:13-21:09:131st Recovery (30 min)
bufferingtime
21:10:42-21:43:02 2nd Running (32 min 20 sec)
21:43:02-22:13:022nd Recovery (30 min)
HR#
91.6 180.7 112.2 173.4 106.1Tc#
37.66 38.538.11 (0.39 decrease) 38.5 37.96 (0.54 decrease)
PSI 0 7.322 2.388 6.909 1.635
#:the average of the last 1min.*: The data are available for only 25 min.
Using Del’s data (1st 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
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
Food Fluid Clothing Pre-exercise body weight
Fluid Post-exercise body weight
- - Exercise time (mi)
Stage 1 bread 240 ml 0.32 kg 57.66 kg water 57.42 kg - - 26.38
Stage 2 - water New clothes but wet shorts
57.66 kg water 57.45 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?
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 ?