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Unformatted text preview: ys These changes include: increased rate of
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
shorts, shoes, and a t-shirt Exercise Performance in Heat
Exercise Heat stress increases HR independently
(result of increased blood flow to skin)
(result HR in dry hot vs wet hot climates? Heat stress reduces physical exercise
capabilities by 20% of that under temperate
– 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?
– Shunt blood to core (peripheral constriction) Body size and shape alter heat loss to
environmentenvironment– The smaller one is the more likely they are to
– 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
– Will produce anorexia in the tissue due to lack
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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.
- Spring '11