2007, Piran, Slovenia

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Environmental Ergonomics XII Igor B. Mekjavic, Stelios N. Kounalakis & Nigel A.S. Taylor (Eds.), © BIOMED, Ljubljana <strong>2007</strong> THERMAL RESPONSE DURING SEARCH AND RESCUE: A COMPARISON BETWEEN FIREFIGHTING CLOTHING AND GAS TIGHT SUIT Victoria Richmond, Mark Rayson, David Wilkinson, James Carter Optimal Performance Ltd, Bristol,UK Contact person: vic@optimalperformance.co.uk INTRODUCTION The UK Fire and Rescue Service often exposes their personnel to working conditions that can lead to heat strain, such as high ambient temperatures and radiant heat loads, physically demanding tasks and the wearing of personal protective equipment (PPE) that limits heat loss. Core temperatures (Tc) in excess of 39 ° C have routinely been observed in typical fire training (Graveling et al., 2001) and in some cases as high as 41 ° C (Smith et al., 1997). High Tc such as these have been found to be one of the dominant factors responsible for limiting work capacity during a range of emergency service scenarios (Rayson et al., 2004). During firefighting duties, normal firefighting PPE (NPPE) is worn which includes a fire retardant tunic and trousers, boots, gloves, helmet and breathing apparatus. For firefighters attending a chemical, biological, radiological and nuclear (CBRN) incident, a Gas-Tight Suit (GTS) is worn, which is impermeable and fully encapsulating. The wearing of such protective, impermeable clothing, together with working in a hot environment, creates a condition of uncompensable heat stress where the cooling required to maintain thermal equilibrium exceeds the evaporative capacity of the environment (McLellan, 1998). All firefighting activities are dependent to a greater or lesser extent upon the physiological capabilities of firefighters. Thus, the physiological limitations of firefighters must be considered when planning for conventional and terrorist incidents within the built and natural environment. Therefore, the purpose of this study was to determine the additional thermal load, if any, associated with wearing the GTS over normal PPE during a sub-surface railway search and rescue scenario. METHOD Twenty firefighters (19 males, 1 female (mean ± SD), age 32 ± 5 yr; height 180 ± 4 cm; body mass 84 ± 9 kg) from London Fire Brigade carried out a search and rescue scenario on a sub-surface railway with the aim of evacuating an unconscious casualty (75 kg manikin) from a train 500 m from the station platform. There were four experimental conditions, which included two different ensembles (NPPE or GTS) with either the travelator (moving walkway allowing access to the platform) on or off. The conditions are coded as C1 (NPPE, travelator on), C2 (GTS, travelator off), C3 (NPPE, travelator off) and C4 (GTS, travelator on). Subjects worked in teams of two, both wearing the same PPE. Each trial consisted of the following sequence; the pair gaining access to the platform on foot, walking 500 m pushing a rescue rail stretcher along the track to the train, locating the manikin and lifting it from the train and onto the rescue rail stretcher, pushing the rescue rail stretcher 500 m back to the platform and carrying the manikin on a stretcher to street level. In the travelator on condition, subjects ‘rode’ on the travelator for access to and from the platform. In the travelator off condition, subjects had to climb 6 flights of stairs for access to the platform / street level. 200
Personal protective equipment Tc was measured using an ingestible telemetry pill (HQInc, Fl, USA) and skin temperature (Ts) was measured at four sites (neck, scapula, hand, shin) using skin thermistors attached to a Squirrel data logger (SQ 800, Grant, Cambridge, UK). Sweat rate was measured by weighing the subjects prior to and immediately after the scenario. Subjective ratings of thermal comfort were provided by the participants before and after each trial. RESULTS The total duration of the serials, which averaged ~58 min, did not differ between experimental conditions, although the work rate whilst carrying the casualty was significantly different (p
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ENVIRONMENTAL ERGONOMICS XII Procee
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ENVIRONMENTAL ERGONOMICS XII Procee
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International Conferences on Enviro
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TABLE OF CONTENTS Table of contents
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Table of contents ALTITUDE ATTENUAT
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Table of contents TOWARDS PREVENTIO
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Table of contents RATE AFFECT EXERC
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Table of contents Uroš Dobnikar, S
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Table of contents TO A HOT ENVIRONM
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Table of contents Andreas D. Flouri
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Table of contents PHYSICAL FITNESS
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Table of contents ESTIMATION OF THE
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Herman Potocnic Lecture the advanta
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Invited presentation Gravitational
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Gravitational Physiology SKELETAL M
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Lf (mm) 50.0 40.0 30.0 20.0 10.0 Fa
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Gravitational Physiology maximum is
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Gravitational Physiology THERMOREGU
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Gravitational Physiology THE EXERCI
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Gravitational Physiology Since exer
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Gravitational Physiology During the
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Gravitational Physiology CARDIOVASC
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as observed at rest after LBNP was
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Gravitational Physiology THERMOREGU
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Gravitational Physiology THE EFFECT
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Gravitational Physiology Fortney SM
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Gravitational Physiology Contractil
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Gravitational Physiology Edgerton V
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Diving Physiology A library of imag
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Diving Physiology Information recal
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Diving Physiology RESULTS Figure 1
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Diving Physiology sensitivity is no
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Diving Physiology Physiological Mea
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Diving Physiology same sequence. Th
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Diving Physiology HYPERVENTILATION
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Diving Physiology software. Individ
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Diving Physiology REFERENCES IMCA.
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Diving Physiology recorded (MIE Med
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Diving Physiology DISCUSSION The ma
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Altitude Physiology vastus laterali
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Altitude Physiology IS INTERMITTENT
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Altitude Physiology Table 2: Lactat
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Altitude Physiology CARBOHYDRATE IN
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Altitude Physiology Figure 1: Mean
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Altitude Physiology HYPOXIA INDUCED
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Altitude Physiology Figure 1. Mean
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Altitude Physiology ANALYSIS OF MUS
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SOL MG TA BF VM Altitude Physiology
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Altitude Physiology LOAD CARRIAGE I
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Table 2: Differential ratings of pe
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Altitude Physiology EFFECTS OF INTE
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Cerebral deoxy-Hb (delta, µM) Cere
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Altitude Physiology ENDURANCE RESPI
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Altitude Physiology Wylegala JA, Pe
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Invited presentation Cognitive and
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Cognitive and Psycophysiological Fu
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Cognitive and psychophysiological f
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CLOTHING AND TEXTILE SCIENCE 131
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Clothing SPACER FABRICS IN OUTDOOR
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F i / g m -2 4,0 3,5 3,0 2,5 2,0 1,
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Clothing TOTAL EVAPORATIVE RESISTAN
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9,0 8,0 7,0 6,0 5,0 4,0 3,0 2,0 1,0
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Clothing DIFFERENCES IN CLOTHING IN
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Clothing parallel It values ranged
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Clothing CORRELATION BETWEEN SUBJEC
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Clothing and left side chest, scapu
Page 149 and 150: Clothing studies using an ice vest
Page 151 and 152: Insulation (Clo) (Clo) Clo / kg 6 5
Page 153 and 154: Clothing EFFECTS OF MOISTURE TRANSP
Page 155 and 156: Clothing the P plots above 60%RH (p
Page 157 and 158: Clothing EFFECT OF CLOTHING INSULAT
Page 159 and 160: Clothing EFFECTS OF QUILT AND MATTR
Page 161 and 162: 38 33 28 23 18 0 30 60 90 120 150 m
Page 163 and 164: Clothing German) were measured, and
Page 165 and 166: Clothing Metabolism decreased and w
Page 167 and 168: Clothing Table 1. Comparison of ski
Page 169 and 170: Clothing PHYSIOLOGICAL RESPONSES AT
Page 171 and 172: Clothing underwear at 25 °C in per
Page 173 and 174: Clothing REDUCTION OF HEAT STRESS I
Page 175 and 176: Clothing THE INTERACTION BETWEEN PH
Page 177 and 178: Relative humidity (%) Clothing Figu
Page 179 and 180: Clothing DEVELOPMENT OF THE “WEAR
Page 181 and 182: Clothing EFFECTS OF AIR GAPS UNDER
Page 183 and 184: Temper at ur e( ˇ ć) 28.5 27.5 26
Page 185 and 186: Personal protective equipment Invit
Page 187 and 188: Personal protective equipment fabri
Page 189 and 190: Personal protective equipment PHYSI
Page 191 and 192: Mean skin temperature (ºC) 38.0 37
Page 193 and 194: Personal protective equipment the S
Page 195 and 196: Personal protective equipment DISCU
Page 197 and 198: Personal protective equipment Final
Page 199: Personal protective equipment REFER
Page 203 and 204: Personal protective equipment level
Page 205 and 206: F i / g m -2 300 250 200 150 100 50
Page 207 and 208: h M / % 90 80 70 60 50 40 activity
Page 209 and 210: Personal protective equipment 0.05
Page 211 and 212: Personal protective equipment was u
Page 213 and 214: Personal protective equipment THERM
Page 215 and 216: Personal protective equipment the s
Page 217 and 218: Personal protective equipment the c
Page 219 and 220: Personal protective equipment wette
Page 221 and 222: Table 1 1. Properties of the tested
Page 223 and 224: Personal protective equipment HEAT
Page 225 and 226: Personal protective equipment Profi
Page 227 and 228: Personal protective equipment PHYSI
Page 229 and 230: Personal protective equipment REDUC
Page 231 and 232: 39.0 38.5 38.0 37.5 37.0 36.5 40.0
Page 233 and 234: Personal protective equipment EXERC
Page 235 and 236: Personal protective equipment appro
Page 237 and 238: Personal protective equipment Table
Page 239 and 240: Personal protective equipment reduc
Page 241 and 242: Invited presentation Non-thermal fa
Page 243 and 244: Non-thermal factors heat loss by al
Page 245 and 246: Non-thermal factors DOES A FATIGUE-
Page 247 and 248: Non-thermal factors cycling, despit
Page 249 and 250: Non-thermal factors INDIVIDUAL VARI
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Non-thermal factors to some categor
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Non-thermal factors RATES OF TOTAL
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Non-thermal factors CHANGES IN BLOO
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Non-thermal factors Table 1. Thresh
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Non-thermal factors THE DIFFERENCE
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Water intake(g) 2000 1800 1600 1400
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Non-thermal factors IMPROVED FLUID
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Non-thermal factors A tendency for
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Sweating Table 1: Sweat gland count
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Sweating Taylor, N.A.S. (2000). Reg
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Sweating back/waist area and finall
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Figure 1: A chrome dome following p
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Sweating Such differences could be
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Sweating the forearm and thigh skin
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Sweating dramatically after puberty
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Sweating In addition local sweating
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Sweating REGIONAL FOOT SWEAT RATES
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Sweating REGIONAL SWEAT RATES OF TH
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Sweating Figure 2 shows the skin te
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Sweating SWEATY HANDS: DIFFERENCES
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Sweating Figure 2: Inter-site sweat
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Sweating REGIONAL DIFFERENCES IN TO
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Sweating Figure 2: Inter-site sweat
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Sweating MENSTRUAL CYCLE DOES NOT A
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Sweating RESULTS On average, the ma
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Sweating THE SWEAT SECRETION AND SO
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Sweating Figure 1: A quadrant diagr
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Invited presentation FINGER COLD IN
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Cold physiology INTRA-INDIVIDUAL DI
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Cold physiology number was estimate
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Cold physiology cold receptors decr
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Cold physiology EFFECT OF URAPIDIL
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Cold physiology THE EFFECT OF EXERC
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TRAINABILITY OF COLD INDUCED VASODI
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Cold physiology REFERENCES Adams, T
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Cold physiology THE EFFECT OF REPEA
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Cold physiology THE EFFECT OF ALTIT
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Cold physiology SKIN SURFACE MENTHO
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Cold physiology COGNITIVE PERFORMAN
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Seconds 6.5 6.0 5.5 5.0 4.5 4.0 3.5
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Cold water immersion REFERENCES Mek
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Cold water immersion the formula: M
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Cold water immersion REFERENCES Cho
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Cold water immersion were: 1 metre
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Cold water immersion surf beaches.
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Cold water immersion Table 1. Break
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Cold water immersion ARM INSULATION
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Cold water immersion RESULTS Experi
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Cold water immersion thermogenesis
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Cold water immersion The other comp
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Cold water immersion REFERENCES And
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Thermal comfort THERMAL SENSATIONS
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Exer - cise PC Wind (m·s -1 ) 0 ne
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Thermal comfort and heart rate usin
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Thermal comfort A NEW METHOD FOR EV
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Thermal comfort DEVELOPMENT OF AN I
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Thermal comfort DISCUSSION This new
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Thermal comfort limit of exposure d
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Table 2: Statistical summary. Gende
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Thermal comfort comfortable”), wh
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Thermal comfort RELATION BETWEEN TH
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Thermal comfort Figure 2. Skin wett
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Thermal comfort THE EVALUATION OF T
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Temp.ˇ ]˘ Jˇ ^ 42 40 38 36 34 32
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time(min) Thermal comfort WHY DO JA
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Thermal comfort TCT : THERMAL COMFO
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Thermal comfort INTERNATIONAL STAND
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Acute and chronic heat exposure PHY
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Acute and chronic heat exposure Fig
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Acute and chronic heat exposure EFF
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Acute and chronic heat exposure 2.2
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Acute and chronic heat exposure EFF
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Acute and chronic heat exposure A N
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Acute and chronic heat exposure of
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Acute and chronic heat exposure PHY
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Acute and chronic heat exposure Tab
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Acute and chronic heat exposure INT
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probability plot 99 95 80 60 40 20
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Acute and chronic heat exposure HAN
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Acute and chronic heat exposure ALL
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Acute and chronic heat exposure Tab
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Acute and chronic heat exposure UNC
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Thermal Sensation Scale 10 9 8 7 6
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Acute and chronic heat exposure RES
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Acute and chronic heat exposure eve
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Acute and chronic heat exposure 30%
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Acute and chronic heat exposure REF
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RADIANT FLOW THROUGH BICYCLE HELMET
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Figure 2. Difference in heat transf
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Manikins DEVELOPMENT OF A LYING DOW
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IT = 6.45( _ ,Tsk - _ ,Tair)/(Q/A)
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Manikins cases. If the body is even
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Heat balance components 100% 80% 60
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Manikins clothing system. This effe
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Manikins The coupled system was val
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Manikins A NOVEL APPROACH TO MODEL-
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Manikins THERMAL MANIKIN EVALUATION
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SR (g/min) Figure 2. Predictive mod
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ESTIMATION OF COOLING EFFECT OF ICE
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Manikins Figure 3: Comparison among
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Manikins EVALUATION OF THE ARMY BOO
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Ty [Nm] 60 50 40 30 20 10 0 0 5 10
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Manikins different black 100% cotto
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Manikins REFERENCES Bogerd, C.P., H
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Modelling RESULTS From this kind of
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Modelling (T , T , V& , ) = 1. 0 +
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NORMALIZED CVCL 8 7 6 5 4 3 2 1 0 M
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Modelling illustrated in Figure 1.
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Modelling MODELLING PATIENT TEMPERA
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Modelling Figure 1: Blood and mean
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Modelling simulations the additiona
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Modelling Table 1. Descriptive summ
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Modelling concomitant increase in b
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Modelling REFERENCES 1. U.S. Depart
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Modelling from the 1988 population.
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Modelling somatotypes in multivaria
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Modelling Each scan data was first
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Modelling The line through the data
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Hip( width) −Waist ( width ) HW
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Modelling measurements are extracte
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Measurement methods not included in
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Measurement methods humidity. The o
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Measurement methods DISCUSSION Base
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Air film Skin surface Skin layer δ
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Measurement methods and calculated
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Rectal temperature ( o C) 39.5 39.0
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Measurement methods work rates, and
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Measurement methods HUMIDEX: CAN TH
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Measurement methods highlighted. In
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Invited presentation Universal Ther
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Universal Thermal Climate Index dat
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Universal Thermal Climate Index DYN
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Universal Thermal Climate Index DIS
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Universal Thermal Climate Index COM
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Skin temperature (°C) Universal Th
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Universal Thermal Climate Index PRO
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Universal Thermal Climate Index The
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Universal Thermal Climate Index ASS
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Universal Thermal Climate Index ima
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Universal Thermal Climate Index min
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Working environment EFFECTS OF LIGH
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Working environment It is interesti
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30 25 20 15 10 5 0 25 12 Working en
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Working environment ERGONOMICS OPTI
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Working environment astigmatism, an
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Working environment RESULTS The hig
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Working environment hearing protect
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Working environment Redistribution
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Working environment DISCUSSION Thes
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Working Environment over the phone
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Working Environment DISCUSSION Diff
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Working Environment results, conclu
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Working Environment BP as the refer
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Working Environment significantly a
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Working Environment responses betwe
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Working Environment Casualty handli
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Working Environment REFERENCES Davi
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Working Environment RESULTS The sub
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Temperature (C) 35 33 31 29 27 25 2
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Working Environment METHODS Student
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Working Environment ANTHROPOGENIC I
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Working Environment RESULTS The res
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Employment Standards VISUAL ACUITY
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Employment Standards Results are pr
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Employment Standards to spend free
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Occupational Thermal Problems and d
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Occupational Thermal Problems HEAT
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Occupational Thermal Problems some
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Occupational Thermal Problems HORSE
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Occupational Thermal Problems range
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Occupational Thermal Problems PHYSI
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Occupational Thermal Problems DISCU
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Occupational Thermal Problems recom
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DLEmin [hours] 7,0 6,0 5,0 4,0 3,0
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Occupational Thermal Problems EFFEC
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Occupational Thermal Problems PERIP
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Occupational Thermal Problems durin
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Occupational Thermal Problems PRODU
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Time (hours) 4 3,5 3 2,5 2 1,5 1 0,
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Occupational Thermal Problems (Suun
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Occupational Thermal Problems highl
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Occupational Thermal Problems and o
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1) estimated (208 - 0.7 x age) *P
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Occupational Thermal Problems of a
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Occupational Thermal Problems tempe
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Table 1: Environmental conditions o
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Occupational Thermal Problems The h
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Occupational Thermal Problems RESUL
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Occupational Thermal Problems PHYSI
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Occupational Thermal Problems corre
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Occupational Thermal Problems DEVEL
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Occupational Thermal Problems All i
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A Adolfsson Niklas 540 Ainslie Phil
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Kim Myung-Ju 409 Kim Taegyou 189 Kl
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Sormunen Erja 599 Spindler Uli 145
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SPONSOR 641
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