Kinesiology 2236A/B Lecture Notes - Lecture 46: Stroke Volume, Water Intoxication, Vascular Resistance
16 Oct 2018
School
Department
Course
Professor
Document Summary
As atmospheric temperature increases, the temperature gradient between air and body decreases. When tbody is greater than the tenviron we lose heat via radiation. Over 27 celsius (80 f) the body absorbs heat. Heat is generated by endogenous sources (muscle activity and metabolism) Exogenous sources: transfer to body when tenviron is warmer than tbody. When an athlete exercises in a hot environment they sweat to dissipate heat. An increase in humidity will decrease the vapour gradient, therefore there will be less evaporation: = increase tbody and/or decreased evaporation. Must take the humidity into consideration substantial humidity, even at low temperatures can be dangerous. Possible heat stroke with continued exposure or pa. Heatstroke, heat exhaustion and heat cramps possible with prolonged exposure/pa. Traditional heat definitions: neither are due to heat issues *must maintain movement in lower extremity* Modern hypothesis for heat cramps: alterations in spinal cord reflex activity secondary to fatigue.
