Mov 470 Ch 7 Environmental Factors

Changes include increased rate of these sweating

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Unformatted text preview: ys These changes include: increased rate of These sweating, lowered HR, lower internal body temperature during exercise in heat temperature How much exposure is needed? – 100 minutes/ day Exercise Testing & Prescription Exercise What is the WBGT? – Wet bulb globe temperature – Heat index used to quantify climate heat stress ACSM risk categories for thermal stress: – 1 – Very high risk (above 82 degrees F) – 2 – High 73 -82 – 3 – Moderate was 65-83 – 4 – Low - less than 65 Representative for persons in running Representative shorts, shoes, and a t-shirt Exercise Performance in Heat Exercise Heat stress increases HR independently Heat (result of increased blood flow to skin) (result HR in dry hot vs wet hot climates? Heat stress reduces physical exercise Heat capabilities by 20% of that under temperate environmental conditions environmental – The older they are the less they can adapt Heat tolerance in older individuals Human Physiological Responses to cold Responses Initial responses to cold stress? – shivering shivering – Goosebumps – Shunt blood to core (peripheral constriction) Body size and shape alter heat loss to Body environmentenvironment– The smaller one is the more likely they are to The start shivering – Ended up working harder to get to equilibrium Larger Surface area :FFM ratio Thermoregulatory Responses to Exercise in the Cold Exercise Most apparent systemic alteration is Most peripheral vasoconstriction peripheral – Will produce anorexia in the tissue due to lack W...
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This note was uploaded on 05/29/2011 for the course MOV 470 taught by Professor Crawley during the Spring '11 term at Grand Valley State University.

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