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Temperature Regulation: Hot and Cold Acclimatization
- 1. Temperature Regulation MPhil Exercise Physiology PhD Scholar at UOK
- 2. OVERVIEW OF HEAT BALANCE DURING EXERCISE The goal of temperature regulation is to maintain a constant core temperature and thus prevent overheating or overcooling.
- 3. When the body is attempting to lose heat, blood flow is increased to the skin as a means of promoting heat loss to the environment. In contrast, when the goal of temperature regulation is to prevent heat loss, blood is directed away from the skin and toward the interior of the body to prevent additional heat loss
- 4. It is important to point out that within the body, temperature varies significantly There is a gradient between core temperature (i.e., deep central areas, including the heart, lungs, abdominal organs) and the shell (skin) temperature
- 6. TEMPERATURE MEASUREMENT DURING EXERCISE Ingestible core temperature pills Mercury Thermometers
- 7. OVERVIEW OF HEAT PRODUCTION/HEAT LOSS Preoptic-anterior hypothalamus (POAH) works like a thermostat
- 8. Heat Production Heat production in the body can be classified as: Voluntary Involuntary
- 10. Heat Loss Heat loss from the body may occur by four processes: (1)Radiation, (2)Conduction, (3)Convection, and/or (4)Evaporation.
- 13. Heat Storage in the Body during Exercise Body heat gain during exercise = (heat produced heat loss) Heat required to increase body temperature by 1属C = (specific heat body mass)
- 18. EXERCISE IN A HOT ENVIRONMENT Sweat Rates during Exercise Exercise Performance Is Impaired in a Hot Environment Gender and Age Differences in Thermoregulation Heat Acclimation
- 22. EXERCISE IN A COLD ENVIRONMENT Individuals with a high percentage of body fat have an advantage over lean individuals when it comes to cold tolerance
- 23. Physiological Responses to Exercise in the Cold Factors Affecting Body Heat Loss during Cold Exposure Cold Stress Effects on Exercise Performance Health Risks during Exercise in the Cold Cold Acclimation
Editor's Notes
- #2: Core body temperature is the temperature of the bodys internal organs A normal body temperature ranges between 36.5 and 37.4属C, but temperature readings vary, depending on where it is measured.
- #9: shivering - nerve impulses are sent by the hypothalamus to the skeletal muscles to bring about rapid contractions that generate heat. Shivering therefore helps raise the body temperature. Contraction of hair erector muscles - this traps a layer of warm air at the skin that acts as extra insulation. Vasoconstriction油- blood vessels near the surface of the skin called arterioles constrict (become narrower) allowing less blood to the skin surface and therefore less heat is lost by radiation.