Not all bodily reactions consume oxygen and produce carbon dioxide, but without the reactions that do, the remaining reactions of the cells would eventually stop, and the cells would die. When a person expends calories, the body uses oxygen and produces carbon dioxide. ![]() For numerous methodological reasons, the method of indirect calorimetry is the most suitable and accurate to evaluate caloric expenditure during exercise. These methods are termed direct calorimetry and indirect calorimetry, respectively, and the research and validation of these methods date back to the late 1890's (Lusk, 1928). Research has shown that during exercise the increase in caloric expenditure is almost entirely due to the contraction of skeletal muscle the balance is due to an increase in the energy demands of the heart and the muscles used during ventilation.Ĭaloric expenditure can be measured directly, which requires the measurement of the heat released by the body, or indirectly be measuring ventilation and the exchange of oxygen and carbon dioxide by the body. The energy released from the breakdown of ATP fuels the contraction of skeletal muscle, thereby adding to the energy demands of the body and raising caloric expenditure. Exercise adds to the caloric expenditure of the body, as muscle contraction involves the need to repeatedly form and breakdown ATP. These energy demanding functions combine to form the body's basal metabolic rate, which can vary from approximately 800 to 1500 Kcals depending upon body size and total caloric intake (ingested quantity of food).Īdenosine triphosphate (ATP) is the main molecule the body uses as a means to use chemical energy to perform cellular work. This energy is also used to form the molecules necessary for repairing cells, storing energy (glycogen and triglycerides), fighting infection, and processing nutrients obtained from digestion. In addition, maintaining a life supporting environment within and around cells requires a constant breakdown of certain energy releasing molecules. The continual pumping of blood by the heart demands energy, as does the continual ventilation (movement of air into and out) of the lungs. What determines caloric expenditure during exercise?Īt rest, your body expends energy to maintain the functions of cells that are essential for life. The results presented will be combined with the published research on this topic to clearly illustrate the interrelation between exercise intensity, lower and upper body exercise, and caloric expenditure. We will then present data from a laboratory case study we conducted to compare cardiorespiratory responses and caloric expenditure during cycle ergometry, arm ergometry, and combined leg and arm ergometry. We will begin with a brief discussion on the relationship between aerobic exercise, caloric expenditure, and exercise intensity. In addition, you can better explain to your clients the truth about many of the advertising claims that suggest a particular exercise modality is best for caloric expenditure and weight loss. With this knowledge you can effectively educate your clients to more realistic goals that may be accomplished with your exercise prescription. You the fitness professional should be aware of what determines how many calories your body burns during exercise, why your body obeys certain rules that dictate the magnitude of caloric expenditure, and what are the best types of exercises that increase caloric expenditure. This situation is the fundamental reason for writing this article. There are many types of exercise modalities that are marketed with the claim of 'burning more calories,' and the consumer is left to wonder just what it is that determines the number of calories burned during exercise. The suitability of exercise as a means to burn calories has been recognized by the fitness industry. ![]() type II diabetes, heart disease, etc.), that exercise adds to total caloric expenditure, and that exercise also maximizes body fat loss and the maintenance or increase of muscle mass, participation in exercise is a very consequential and rewarding strategy to lose body fat and improve your health. When combined with the facts that reducing body fat can reverse several disease processes (eg. adults between the age of 20 through 74 are overweight, which clearly demonstrates the impact of this national concern. Department of Health and Human Services (1992), 26% of U.S. If people answered honestly to the question, 'What are the reasons why you exercise?', a frequent answer would be to burn calories.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |