0
Body Composition <ul><li>Body composition involves all components of the body including: </li></ul><ul><li>Fat mass </li><...
Body Composition <ul><li>We’ve talked about muscle mass, so this section will focus on fat management. </li></ul>
Body Composition <ul><li>Obesity </li></ul><ul><li>May be functionally defined as the percent body fat at which disease ri...
Body Composition <ul><li>Obesity is an excessive amount of body fat relative to body weight and is not synonymous with ove...
Body Composition <ul><li>In epidemiological studies: </li></ul><ul><li>overweight is >120% of desirable weight </li></ul><...
Body Composition <ul><li>Because these overweight criteria do not take into account the composition of the excess weight, ...
Body Composition <ul><li>An excessive percentage of body fat is associated with increased risk for development of hyperten...
Body Composition <ul><li>The prevalence of hypercholesterolemia, hypertension, and Type II diabetes is, respectively 2.9, ...
Body Composition <ul><li>Recent evidence indicates that “central obesity” is particularly problematic. </li></ul><ul><li>A...
Body Composition <ul><li>Android and Gynoid Obesity </li></ul>
Body Composition <ul><li>In addition, obesity often carries negative social stigma and is associated with a reduced physic...
Body Composition <ul><li>At the opposite extreme, individuals with too little body fat tend to be malnourished. </li></ul>
Body Composition <ul><li>These people have a relatively higher risk of fluid-electrolyte imbalances, osteoporosis and oste...
Body Composition <ul><li>One disease associated with extremely low body fat levels is anorexia nervosa. </li></ul>
Body Composition <ul><li>Anorexia nervosa is an eating disorder found primarily in females and is characterized by excessi...
Body Composition <ul><li>Compared to normal women, anorexics have extremely low body fat levels (8 to 13%), signs of muscl...
Body Composition <ul><li>Combating obesity and eating disorders is not an easy task. </li></ul>
Body Composition <ul><li>Many overweight and obese individuals have incorporated patterns of overeating and physical inact...
Body Composition <ul><li>Many are lured by fad diets and exercise gimmicks, and some resort to extreme behaviors such as a...
Body Composition <ul><li>Body fat is reduced when a chronic negative caloric balance exists. </li></ul>
Body Composition <ul><li>It is recommended that both an increase in caloric expenditure through exercise and a decrease in...
Body Composition <ul><li>Exercise increases energy expenditure and slows the rate of fat-free tissue loss that occurs when...
Body Composition <ul><li>Exercise also helps maintain the resting metabolic rate and thus the rate of weight loss. </li></ul>
Body Composition <ul><li>Hormones play an important role in regulating metabolism. </li></ul>
Body Composition <ul><li>Thyroxine is extremely important in regulating resting metabolic rate. </li></ul><ul><li>Underpro...
Body Composition <ul><li>Growth hormone, epinephrine, norepinephrine, and various sex hormones may elevate RMR as much as ...
Body Composition <ul><li>These hormones increase during exercise and may be responsible for the elevation in resting metab...
Body Composition <ul><li>Improper diet, overeating, hormonal disturbances, and physical inactivity may create a positive e...
Body Composition <ul><li>Lack of physical activity rather than overeating is a more common cause of obesity in children an...
Body Composition <ul><li>Obese individuals are invariably sedentary and many have had poor experiences with exercise in th...
Genetics <ul><li>Only 10% of children who had normal-weight parents were obese. </li></ul>
Genetics <ul><li>The probability of being obese is increased to 40% and 80%, respectively, if one parent or both parents a...
Genetics <ul><li>Although these data suggest a strong genetic influence, they do not rule out environmental influences suc...
Genetics <ul><li>Approximately 25% of the variability among individuals in absolute and relative body fat is attributed to...
Body Composition <ul><li>The exercise professional should interview the obese participant to determine past exercise histo...
Body Composition <ul><li>This may increase adherence to an agreed upon exercise program. </li></ul>
Psychological Issues <ul><li>Overweight and obesity may be caused by psychological factors. </li></ul>
Psychological Issues <ul><li>Some overweight and obese individuals use food and eating as a coping mechanism or defense me...
Psychological Issues <ul><li>Compulsive eaters may eat to cope with feelings of insecurity, anxiety, depression, lonelines...
Psychological Issues <ul><li>In this case, the individual needs to recognize the fact that he or she is eating compulsivel...
Psychological Issues <ul><li>Encourage clients with eating disorders to seek psychological counseling. </li></ul>
Body Composition <ul><li>Obesity is associated with increases in both the number (hyperplasia) and size (hypertrophy) of f...
Body Composition <ul><li>An increase in fat cell number occurs rapidly during the last trimester in the womb through the f...
Body Composition <ul><li>Fat cells grow in size when excess fat is stored in the cells as triglycerides. </li></ul><ul><li...
Body Composition <ul><li>Similarly, caloric restriction and exercise are effective in reducing fat cell size, but not the ...
Body Composition <ul><li>The key to preventing obesity is to closely monitor the dietary intake and energy expenditure, es...
Body Composition <ul><li>This could potentially retard the development of new fat cells and control the size of existing f...
Lifestyle Change <ul><li>Adoption of a physically active lifestyle. </li></ul><ul><li>Adoption of dietary guidelines. </li...
Dietary Guidelines <ul><li>Eat a variety of foods. </li></ul><ul><li>Balance the food you eat with physical activity. </li...
Dietary Guidelines <ul><li>Choose a diet low in fat, saturated fat, and cholesterol. </li></ul><ul><li>Choose a diet moder...
Dietary Guidelines <ul><li>If you drink alcoholic beverages, do so in moderation. </li></ul>
Behavior Modification <ul><li>Behavior modification techniques can help people make these lifestyle changes. </li></ul>
Behavior Modification <ul><li>Exercise specialists, nutritionists, and psychologists need to work together to help their c...
Body Comp. - Fat Loss <ul><li>The initial exercise prescription should be based on low intensity and progressively longer ...
Body Composition <ul><li>On the basis of each person’s response to the initial exercise program, the exercise professional...
Body Composition <ul><li>The higher intensity will allow for a shorter duration per session, or fewer sessions per week fo...
Body Composition <ul><li>In addition, the transition to higher intensity exercise will increase the number of opportunitie...
Body Composition <ul><li>However, for many (especially older) obese subjects, a walking or other low intensity exercise pr...
Body Composition <ul><li>The needs and goals of the obese subject must be individually matched with the proper exercise pr...
Caloric Balance <ul><li>Body composition is determined by a complex set of genetic and behavioral factors. </li></ul>
Caloric Balance <ul><li>Though the contributing variables are many, the fundamental determinant of body weight and body co...
Caloric Balance <ul><li>Caloric balance refers to the difference between caloric intake and caloric expenditure. </li></ul>
Caloric Balance <ul><li>The First Law of Thermodynamics states that energy is neither created nor destroyed; therefore, bo...
Caloric Balance <ul><li>One pound of body fat (adipose tissue) is equivalent to approximately 3500 kcal of energy. </li></ul>
Caloric Balance <ul><li>Although it is predictable that shifts in caloric balance will be accompanied by changes in body w...
Caloric Balance <ul><li>For example, fasting and extreme caloric restriction (starvation and semi-starvation diets) cause ...
Caloric Balance <ul><li>In contrast, an exercise-induced negative caloric balance results in weight loss consisting primar...
Caloric Balance <ul><li>High resistance exercise programs may lead to a gain in fat-free weight, while cardiorespiratory e...
Caloric Balance <ul><li>Both types of programs can contribute to a loss of body fat, although aerobic activity is more eff...
Recommendations <ul><li>For most persons, the optimal approach to fat loss combines a mild caloric restriction with regula...
Recommendations <ul><li>A desirable fat loss program is one that meets the following criteria: </li></ul>
Recommendations <ul><li>1. Provides intake not lower than 1220 kcal/day for normal adults and ensures a proper blend of fo...
Recommendations <ul><li>2. Includes foods acceptable to the dieter in terms of socio-cultural background, usual habits, ta...
Recommendations <ul><li>3. Provides a negative caloric balance (not to exceed 500 to 1000 kcal/day), resulting in gradual ...
Recommendations <ul><li>4. Results in a maximal weight loss of 1 kg/week. </li></ul>
Recommendations <ul><li>5. Includes the use of behavior modification techniques to identify and eliminate diet habits that...
Recommendations <ul><li>6. Includes an exercise program that promotes a daily caloric expenditure of 300 or more kcal. </l...
Recommendations <ul><li>7. Provides that new eating and physical activity habits can be continued for life in order to mai...
Caution <ul><li>In designing the exercise component of a weight loss program, the balance between intensity and duration o...
Caution <ul><li>Obese individuals are at an increased relative risk for orthopedic injury, and this may require that the i...
Caution <ul><li>Non-weight bearing activities (and/or rotation of exercise modalities) may be necessary and frequent modif...
Setting Goals <ul><li>A healthy body weight is based on the client’s present FFM and % BF goal. </li></ul>
Upcoming SlideShare
Loading in...5
×

Body Composition Body composition involves all components of ...

947

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
947
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
57
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Transcript of "Body Composition Body composition involves all components of ..."

  1. 1. Body Composition <ul><li>Body composition involves all components of the body including: </li></ul><ul><li>Fat mass </li></ul><ul><li>Muscle mass </li></ul><ul><li>Bone mass </li></ul><ul><li>Water volume </li></ul>
  2. 2. Body Composition <ul><li>We’ve talked about muscle mass, so this section will focus on fat management. </li></ul>
  3. 3. Body Composition <ul><li>Obesity </li></ul><ul><li>May be functionally defined as the percent body fat at which disease risk increases. </li></ul>
  4. 4. Body Composition <ul><li>Obesity is an excessive amount of body fat relative to body weight and is not synonymous with overweight. </li></ul>
  5. 5. Body Composition <ul><li>In epidemiological studies: </li></ul><ul><li>overweight is >120% of desirable weight </li></ul><ul><li>body mass index (BMI) >29.3 for women and 29.8 for men. </li></ul>
  6. 6. Body Composition <ul><li>Because these overweight criteria do not take into account the composition of the excess weight, they are limited as indexes of obesity and may result in misclassifications of obesity. </li></ul>
  7. 7. Body Composition <ul><li>An excessive percentage of body fat is associated with increased risk for development of hypertension, diabetes, CAD, and other chronic diseases. </li></ul>
  8. 8. Body Composition <ul><li>The prevalence of hypercholesterolemia, hypertension, and Type II diabetes is, respectively 2.9, 2.1, and 2.9 times greater in overweight than in non-overweight persons. </li></ul>
  9. 9. Body Composition <ul><li>Recent evidence indicates that “central obesity” is particularly problematic. </li></ul><ul><li>Abdominal fat is strongly associated with diseases such as CHD, diabetes, hypertension, and hyperlipidemia. </li></ul>
  10. 10. Body Composition <ul><li>Android and Gynoid Obesity </li></ul>
  11. 11. Body Composition <ul><li>In addition, obesity often carries negative social stigma and is associated with a reduced physical working capacity. </li></ul>
  12. 12. Body Composition <ul><li>At the opposite extreme, individuals with too little body fat tend to be malnourished. </li></ul>
  13. 13. Body Composition <ul><li>These people have a relatively higher risk of fluid-electrolyte imbalances, osteoporosis and osteopenia, bone fractures, muscle wasting, cardiac arrhythmias, and sudden death, edema, and renal and reproductive disorders. </li></ul>
  14. 14. Body Composition <ul><li>One disease associated with extremely low body fat levels is anorexia nervosa. </li></ul>
  15. 15. Body Composition <ul><li>Anorexia nervosa is an eating disorder found primarily in females and is characterized by excessive weight loss. </li></ul>
  16. 16. Body Composition <ul><li>Compared to normal women, anorexics have extremely low body fat levels (8 to 13%), signs of muscle wasting, and less bone mineral content and bone density. </li></ul>
  17. 17. Body Composition <ul><li>Combating obesity and eating disorders is not an easy task. </li></ul>
  18. 18. Body Composition <ul><li>Many overweight and obese individuals have incorporated patterns of overeating and physical inactivity into to their lifestyles, while others have developed food and/or exercise addictions. </li></ul>
  19. 19. Body Composition <ul><li>Many are lured by fad diets and exercise gimmicks, and some resort to extreme behaviors such as avoiding food, bingeing and purging, and exercising compulsively. </li></ul>
  20. 20. Body Composition <ul><li>Body fat is reduced when a chronic negative caloric balance exists. </li></ul>
  21. 21. Body Composition <ul><li>It is recommended that both an increase in caloric expenditure through exercise and a decrease in caloric intake be used to accomplish this goal. </li></ul>
  22. 22. Body Composition <ul><li>Exercise increases energy expenditure and slows the rate of fat-free tissue loss that occurs when a person loses weight by severe caloric restriction. </li></ul>
  23. 23. Body Composition <ul><li>Exercise also helps maintain the resting metabolic rate and thus the rate of weight loss. </li></ul>
  24. 24. Body Composition <ul><li>Hormones play an important role in regulating metabolism. </li></ul>
  25. 25. Body Composition <ul><li>Thyroxine is extremely important in regulating resting metabolic rate. </li></ul><ul><li>Underproduction of thyroxine can reduce RMR 30 to 50%. </li></ul>
  26. 26. Body Composition <ul><li>Growth hormone, epinephrine, norepinephrine, and various sex hormones may elevate RMR as much as 15 to 20%. </li></ul>
  27. 27. Body Composition <ul><li>These hormones increase during exercise and may be responsible for the elevation in resting metabolic rate after cessation of exercise. </li></ul>
  28. 28. Body Composition <ul><li>Improper diet, overeating, hormonal disturbances, and physical inactivity may create a positive energy balance, which leads to excessive weight gain and obesity. </li></ul>
  29. 29. Body Composition <ul><li>Lack of physical activity rather than overeating is a more common cause of obesity in children and adults. </li></ul>
  30. 30. Body Composition <ul><li>Obese individuals are invariably sedentary and many have had poor experiences with exercise in the past. </li></ul>
  31. 31. Genetics <ul><li>Only 10% of children who had normal-weight parents were obese. </li></ul>
  32. 32. Genetics <ul><li>The probability of being obese is increased to 40% and 80%, respectively, if one parent or both parents are obese. </li></ul>
  33. 33. Genetics <ul><li>Although these data suggest a strong genetic influence, they do not rule out environmental influences such as eating and exercise habits. </li></ul>
  34. 34. Genetics <ul><li>Approximately 25% of the variability among individuals in absolute and relative body fat is attributed to genetic factors and 30% is associated with cultural (environmental) factors. </li></ul>
  35. 35. Body Composition <ul><li>The exercise professional should interview the obese participant to determine past exercise history, potential scheduling difficulties, and the locations where exercise might be performed (e.g., sports club, home, street, school gym, or track, etc.) </li></ul>
  36. 36. Body Composition <ul><li>This may increase adherence to an agreed upon exercise program. </li></ul>
  37. 37. Psychological Issues <ul><li>Overweight and obesity may be caused by psychological factors. </li></ul>
  38. 38. Psychological Issues <ul><li>Some overweight and obese individuals use food and eating as a coping mechanism or defense mechanism. </li></ul>
  39. 39. Psychological Issues <ul><li>Compulsive eaters may eat to cope with feelings of insecurity, anxiety, depression, loneliness, stress, and tension rather than to satisfy hunger. </li></ul>
  40. 40. Psychological Issues <ul><li>In this case, the individual needs to recognize the fact that he or she is eating compulsively, identify the underlying reasons for this behavior, and take steps to modify these behaviors. </li></ul>
  41. 41. Psychological Issues <ul><li>Encourage clients with eating disorders to seek psychological counseling. </li></ul>
  42. 42. Body Composition <ul><li>Obesity is associated with increases in both the number (hyperplasia) and size (hypertrophy) of fat cells. </li></ul>
  43. 43. Body Composition <ul><li>An increase in fat cell number occurs rapidly during the last trimester in the womb through the first year of life, around ages 7-8, and again during adolescence, but remains fairly stable in adulthood except in cases of morbid obesity. </li></ul>
  44. 44. Body Composition <ul><li>Fat cells grow in size when excess fat is stored in the cells as triglycerides. </li></ul><ul><li>Weight gain in adults is typically characterized by the enlargement of existing fat cells, rather than the creation of new fat cells. </li></ul>
  45. 45. Body Composition <ul><li>Similarly, caloric restriction and exercise are effective in reducing fat cell size, but not the number of fat cells. </li></ul>
  46. 46. Body Composition <ul><li>The key to preventing obesity is to closely monitor the dietary intake and energy expenditure, especially during the adolescent growth spurt and puberty. </li></ul>
  47. 47. Body Composition <ul><li>This could potentially retard the development of new fat cells and control the size of existing fat cells. </li></ul>
  48. 48. Lifestyle Change <ul><li>Adoption of a physically active lifestyle. </li></ul><ul><li>Adoption of dietary guidelines. </li></ul><ul><ul><li>(US Dept. of Health and Human Services, 1995) </li></ul></ul>
  49. 49. Dietary Guidelines <ul><li>Eat a variety of foods. </li></ul><ul><li>Balance the food you eat with physical activity. </li></ul><ul><li>Choose a diet with plenty of grain products, vegetables, and fruits. </li></ul>
  50. 50. Dietary Guidelines <ul><li>Choose a diet low in fat, saturated fat, and cholesterol. </li></ul><ul><li>Choose a diet moderate in sugars. </li></ul><ul><li>Choose a diet moderate in salt and sodium. </li></ul>
  51. 51. Dietary Guidelines <ul><li>If you drink alcoholic beverages, do so in moderation. </li></ul>
  52. 52. Behavior Modification <ul><li>Behavior modification techniques can help people make these lifestyle changes. </li></ul>
  53. 53. Behavior Modification <ul><li>Exercise specialists, nutritionists, and psychologists need to work together to help their clients, especially obesity prone individuals, modify their physical activity and eating attitudes and behaviors. </li></ul>
  54. 54. Body Comp. - Fat Loss <ul><li>The initial exercise prescription should be based on low intensity and progressively longer durations of activity. </li></ul>
  55. 55. Body Composition <ul><li>On the basis of each person’s response to the initial exercise program, the exercise professional should eventually work toward increasing the intensity to bring the person into a target heart rate range suitable for cardiorespiratory conditioning. </li></ul>
  56. 56. Body Composition <ul><li>The higher intensity will allow for a shorter duration per session, or fewer sessions per week for the same weekly energy expenditure. </li></ul>
  57. 57. Body Composition <ul><li>In addition, the transition to higher intensity exercise will increase the number of opportunities to incorporate activities that naturally require a high rate of energy expenditure. </li></ul>
  58. 58. Body Composition <ul><li>However, for many (especially older) obese subjects, a walking or other low intensity exercise program may be all they desire, and movement toward a more intense program may not be warranted. </li></ul>
  59. 59. Body Composition <ul><li>The needs and goals of the obese subject must be individually matched with the proper exercise program to achieve long-term body composition management. </li></ul>
  60. 60. Caloric Balance <ul><li>Body composition is determined by a complex set of genetic and behavioral factors. </li></ul>
  61. 61. Caloric Balance <ul><li>Though the contributing variables are many, the fundamental determinant of body weight and body composition is caloric balance. </li></ul>
  62. 62. Caloric Balance <ul><li>Caloric balance refers to the difference between caloric intake and caloric expenditure. </li></ul>
  63. 63. Caloric Balance <ul><li>The First Law of Thermodynamics states that energy is neither created nor destroyed; therefore, body weight is lost when caloric expenditure exceeds caloric intake (negative balance) and weight is gained when the opposite situation exists. </li></ul>
  64. 64. Caloric Balance <ul><li>One pound of body fat (adipose tissue) is equivalent to approximately 3500 kcal of energy. </li></ul>
  65. 65. Caloric Balance <ul><li>Although it is predictable that shifts in caloric balance will be accompanied by changes in body weight, the nature of the weight change varies markedly with the specific behaviors that lead to the caloric imbalance. </li></ul>
  66. 66. Caloric Balance <ul><li>For example, fasting and extreme caloric restriction (starvation and semi-starvation diets) cause substantial losses of water and fat-free tissue. </li></ul>
  67. 67. Caloric Balance <ul><li>In contrast, an exercise-induced negative caloric balance results in weight loss consisting primarily of fat. </li></ul>
  68. 68. Caloric Balance <ul><li>High resistance exercise programs may lead to a gain in fat-free weight, while cardiorespiratory endurance training usually results in a maintenance of (or slight increase in) fat-free weight. </li></ul>
  69. 69. Caloric Balance <ul><li>Both types of programs can contribute to a loss of body fat, although aerobic activity is more efficient because it involves a sustained, high rate of energy expenditure. </li></ul>
  70. 70. Recommendations <ul><li>For most persons, the optimal approach to fat loss combines a mild caloric restriction with regular endurance exercise and avoids nutritional deficiencies. </li></ul>
  71. 71. Recommendations <ul><li>A desirable fat loss program is one that meets the following criteria: </li></ul>
  72. 72. Recommendations <ul><li>1. Provides intake not lower than 1220 kcal/day for normal adults and ensures a proper blend of foods to meet nutritional requirements. </li></ul><ul><ul><li>(Note: this requirement may not be appropriate for children, older individuals, and athletes). </li></ul></ul>
  73. 73. Recommendations <ul><li>2. Includes foods acceptable to the dieter in terms of socio-cultural background, usual habits, taste, costs, and ease in acquisition and preparation. </li></ul>
  74. 74. Recommendations <ul><li>3. Provides a negative caloric balance (not to exceed 500 to 1000 kcal/day), resulting in gradual weight loss without metabolic derangement, such as ketosis. </li></ul>
  75. 75. Recommendations <ul><li>4. Results in a maximal weight loss of 1 kg/week. </li></ul>
  76. 76. Recommendations <ul><li>5. Includes the use of behavior modification techniques to identify and eliminate diet habits that contribute to malnutrition. </li></ul>
  77. 77. Recommendations <ul><li>6. Includes an exercise program that promotes a daily caloric expenditure of 300 or more kcal. </li></ul><ul><li>For many participants, this may be best accomplished with low intensity, long duration exercise, such as walking. </li></ul>
  78. 78. Recommendations <ul><li>7. Provides that new eating and physical activity habits can be continued for life in order to maintain the achieved lower body weight. </li></ul>
  79. 79. Caution <ul><li>In designing the exercise component of a weight loss program, the balance between intensity and duration of exercise should be manipulated to promote a high total caloric expenditure (300 to 500 kcal per session and 1000 to 2000 kcal per week for adults). </li></ul>
  80. 80. Caution <ul><li>Obese individuals are at an increased relative risk for orthopedic injury, and this may require that the intensity recommended for improvement of cardiorespiratory endurance. </li></ul>
  81. 81. Caution <ul><li>Non-weight bearing activities (and/or rotation of exercise modalities) may be necessary and frequent modifications in frequency and duration may also be required. </li></ul>
  82. 82. Setting Goals <ul><li>A healthy body weight is based on the client’s present FFM and % BF goal. </li></ul>
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×