Actual Mechanism of Heat Loss during Exercise

Homeostasis can be defined as the balance maintained by the body through negative-feedback to regulate internal conditions within a normal range promoting sustained good health (Seeley, 2006). Exercising initiates a process that propels the body out of its normal parameters, therefore triggering negative-feedback loops with the aim of bringing the internal balance back into homeostasis. Increased energy intensities created through exercise influence heart rate (bpm), respiration and perspiration levels. Each system strives to assist in generating sufficient energy to continue exercising and sustain homeostasis (Sherwood, 2015). Concluding that the body has to work harder in order to maintain the correct internal environment during exercising, it is reasonable to suggest that an increase in heart and respiration rates, as well as

Sweat Glands – extreme decrease in salt reabsorbtion, resulting in high salt content in sweat.

* Thermoregulation: The thermoregulation of the skin is carried out with the help of evaporation of the sweat and regulation of the blood flow to the dermis.

4. Vasodilation peripheral vasodilation increases heat loss by diverting the pre-warmed blood to the surface of the body. Occurs under autonomic stimulation of the hypothalamus. (depends on surrounding temperature – if surrounding air or water is not cooler than skin, the effect is minimal to nonexistent)

10. A. The two mechanisms the body uses to cool itself are the blood vessels and the sweat glands. The sweat glands increase sweat production which cools itself.

Shivering is an indication that hypothermia is on the rise (Giesbrecht and Wilkerson 24). In order to increase Elaine’s body heat, her body resorted to shivering. When shivering, “80 percent of the consumed energy is given off as heat allowing for the heat production to be five times as much as the heat production of the body at rest,” (Giesbrecht and Wilkerson 24). This is able to happen because her skeletal muscle is able to expand and contract to allow for normal body activities to

The scientific, medical explanation about hyperthermia is that thermal regulation centers around the brain help to maintain the internal body temperature by adjusting the amount of salts in perspiration. Electrolytes help the cells in body tissues maintain water balance. In hot weather, a healthy body will lose enough water to cool the body while creating the lowest level of electrolyte imbalance. If the body loses too much salt and fluid, symptoms of dehydration will occur. The healthy human body keeps a steady temperature of 37 degree Celsius, in hot weather, the body perspires. As perspiration evaporates from the skin, the body is cooled, then the thermal regulating system in the brain helps the body adapt to high temperature.

For example, many athletes wear fabrics with wicking because it draws the sweat away from your body and keeps you cooler. Having cooler clothes while exercising in hot weather is an extremely important factor affecting not only heart rate but perceived effort. Warmer temperatures cause the heart to beat faster and place considerable strain on the body. When it is hot, the body must move more blood to the skin to cool it while also maintaining blood flow to the muscles. The only way to do both of these things is to increase overall blood flow, which means that the heart must beat faster. (5) Also, not wearing warm enough clothes in colder weather effects heart rate. As you lose body heat to cold weather, so you heart rate rises, not only to keep your core temperature of 37 °C but to guarantee blood flow to your brain, muscles, and internal organs. (6) Consideration of tightness and looseness of workout gear can affect heart rate during exercise. Choosing material that can let you move and not restrict you is vital also investing in compression tights for certain exercises can help. A study by the University of Essex has found that compression tights can improve energy expenditure while exercising, hasten recovery and improve proprioception. (7) Energy expenditure is directly correlated to heart rate meaning that wearing compressions tights can help people to have a lower heart

Athletes need to cool down and stretch after a workout because otherwise their muscles will stay

A parasympathetic response called Vasodilation happens. Blood vessels directing to the muscles dilate to allow more oxygen to be used. The blood pressure will drop because of the dilation. When we exercise our body will heat up causing blood vessels around our skin to dilate, more blood flows and help to reduce the excess heat in out body.

Doing heavy sport such as run marathon or exercise in the gym can produce much sweat. Produce too much sweat could have a significant loss of fluid and electrolytes in the body such as potassium and calcium. This can cause symptoms from fatigue and reduction in exercise performance to more serious conditions such as heat exhaustion or heat stroke (Leong, 2007). Drinking water after exercise helps to restore water balance in the body. Drinking sport drink, which contain sugar and electrolytes, can replace the electrolytes that loss in the body. Nerve and muscle contraction can be measured by monitoring changes in reaction time to find the effect of sport drink. The reaction time

Cardiovascular drift is the increase in heart rate during prolonged aerobic exercise with a steady-state intensity. This change is usually seen around the 10 minute mark in an exercise. Cardiovascular drift is often seen alongside increased core temperature. Cardiovascular drift can also be caused from dehydration. A study done by Jonathan E. Wingo showed that a dehydration level of 4% caused the same amount of increase in heart rate and decrease in stroke volume as seen in a case of hyperthermia .

If you exercise for longer then your temperature, breathing rate, heart rate, perspiration levels will increase and your skin colour will change.

Range of movement- This is linked to muscle pliability as the warmer the muscles get, the better the elasticity which enable the body to move easier and have a better range of movement around a joint. Exercise increases the production of synovial fluid at a joint, therefore keeps the joints lubricated and makes them suppler. Consequently, allowing a larger range of movement throughout the body. For example if an individual went on the cross trainer for 10 minutes and then went on to the rowing machine; they would have an increased range of movement at their joints, making it easier to exercise on that machine due to the muscles already being warmed up.

Heat is a form of energy that is transferred between two substances at different temperatures. The flow of the energy is from the object of higher temperature to the object of lower temperature. The heat is measured in units of energy, usually calories or joules. Temperature on the other hand, is how cold or hot an object is. The temperature is the average kinetic energy per molecule of a substance. This is measured in degrees on the Celsius or Fahrenheit or in Kelvins.