Download - Cartner on Environmental Heat Stress
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Environmental(HEAT)
BCC 2012. Michaela Cartner
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MdS….Sahara Ultramarathon
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Heat Production
• Humans are furnaces
• 1.1’ C hourly rise
• x20 with exercise
• 42’ C Core temp in trained athletes
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Environmental Heat Transfer
4 Mechanisms
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Environmental Heat Transfer: CONDUCTION
The transfer of heat by direct physical contact
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Environmental Heat Transfer: CONVECTION
The transfer of heat to air and water molecules.
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Environmental Heat Transfer: RADIATION
The transfer of heat via EMG waves. Up to 300kCl /hr
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Environmental Heat Transfer: EVAPORATION
Dominant method of cooling. 1ml of sweat will cool the body by 0.58kcal *(BMR 100kcal/hr :. 200mls sweat)
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PATHOPHYSIOLOGY
Predisposing factors for heat illness
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Classic
Classic
Classic
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Heat Strain Indexes
• Meterological– The wet bulb globe
temperature index.– WBGT= 0.7Tw +
0.2Tg +Ta
– In use by the Military and athletes
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• “ I saved a gram by cutting the tags off my wind pants and an inch off the end of each drawstring” irunfar.com (Bryon Powell)
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Heat Illnesses
Davidatmds2012.weebly.com
“Once the brain started to ignore those repetitive pain signals, comfort levels generally became bearable” Perratt.me.uk
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• The Doc Trotters (52 members, 6000 painkillers and 150L Disinfectant)• Feet preparations include vet supplies/formalin/picric acid/ benzoin /alcohol /henna
/curry Runningsahara.com/training/feet-the-ultimate-training–and-preparation
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Heat Oedema
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Heat Exhaustion
1 Saline drip = 2hr time penalty2 Saline drips = Disqualified
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Heat Exhaustion•Water depletion •Salt depletion
“ Voluntary Dehydration”2/3 of net water loss replaced
•Treat with Saline if orthostatic•Replace with free water <2mOsm/hr.
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Oral rehydration should include cool fluids with 7% carbohydrateAbsorbtion 30% FASTER THAN FREE WATER
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Heat Stroke
“ While I was coherent, I saw some amazing sights.…
Runners passing out at the top of the dunes and tumbling to the base
- one elite runner broke his leg…”
Perratt.me.uk Jackson Griffith
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Heat Stroke
• Rhabdomyolysis + altered LFTs
• Renal failure
• Sweating in 50%• Hypoglycaemia• Coagulopathy
• Hyponatraemia
• CNS- seizures in 75%
Paul Williams, Extreme Ironer MdS 2012
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Heat Stroke- Treatment
• It does not take long either to boil an egg or cook neurons.
D. Hamilton
The Immediate Treatment of Heatstroke Anaesthesia 1976; 31:270-272
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Heat Stroke…Treatment
Cooling methods used in the treatment of exertional heat illness Br J sports med 2005, 39:503-507
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Heat Stroke…Treatment
Cooling methods used in the treatment of exertional heat illness Br J sports med 2005, 39:503-507
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ADF Health Vol 11 2010 pp 9-12
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Heat Stroke…Treatment
• Adjuncts– ICE PACKS– Cooling blankets
– Lavage
– CPB
- BZD
- Discontinue cooling when 39’C
• Fluids– Relative not absolute – Evidence of RHF
Cooling methods used in the treatment of exertional heat illness Br J sports med 2005, 39:503-507
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The End
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Thank you
Samwestonsimonds.com