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Chapter 13Nutrition and Physical Activity
What is fitness? Fitness is defined as the ability to perform
routine physical activity without undue fatigue.
Copyright 2010, John Wiley & Sons, Inc.
Copyright 2010, John Wiley & Sons, Inc.
Exercise, Health and Fitness
The overload principle assumes that the body will adapt to the stresses placed on it.
Aerobic exercise includes endurance exercises such as jogging,
swimming or cycling, or any exercise that increases heart rate and requires oxygen in metabolism.
The cardiorespiratory system includes the circulatory and respiratory systems,
delivering oxygen and nutrients to the cells.
Copyright 2010, John Wiley & Sons, Inc.
Which is true regarding the overload principle?
When you exercise, you should work harder than you think is possible.
The body will adapt to the stresses placed on it.
If people exercise too much, they will not improve fitness.
Overload is to be avoided.
Copyright 2010, John Wiley & Sons, Inc.
Exercise, the Heart and the Muscles Regular aerobic exercise and the heart
strengthens the heart muscle increases stroke volume decreases the resting heart rate. increases ability of cells to use oxygen to produce energy increases the circulatory system's ability to deliver oxygen
The resting heart rate can be measured by counting the number of pulses per minute while at rest.
Aerobic capacity is the body’s maximum ability to generate ATP by aerobic metabolism during exercise. Aerobic capacity is also called VO2 max.
Copyright 2010, John Wiley & Sons, Inc.
Which of the following statements about aerobic capacity is incorrect?
Aerobic capacity is the body's maximum ability to generate ATP by aerobic metabolism during exercise
Aerobic capacity is dependant on the ability of the cardiorespiratory system to deliver oxygen to cells.
Aerobic capacity is dependant on the ability of cells to use oxygen to produce energy.
The smaller a person's aerobic capacity, the more intense activity can be performed before lack of oxygen affects performance.
Excercise and muscle
Stress or overload during exercise causes muscles to adapt by increasing in size and strength. This is called hypertrophy.
When muscles are not used, they atrophy, becoming smaller and weaker.
Copyright 2010, John Wiley & Sons, Inc.
Copyright 2010, John Wiley & Sons, Inc.
Lifting a heavy weight stresses muscles causing an adaptation called
a) hypertrophy
b) hypotrophy
c) atrophy
d) atropic
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Health Benefits of Exercise
In addition to increased flexibility and the ability to easily perform daily activities, benefits of regular exercise include:
Weight management Cardiovascular health Diabetes prevention or management Bone and joint health Possible reduction of cancer risk Psychological health
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The health benefits of exercise include all of the following except
decrease blood pressure
increase HDL cholesterol.
decrease the sensitivity of tissues to insulin.
reduce the risk of osteoporosis.
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Exercise Recommendations
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Todd is 30 years old. If his target heart rate during aerobic activity is 60 - 90 % of his maximum heart rate, how fast should his heart rate be during exercise?
a)
60 and 90
b)114 and 171
c)
132 and 198
d)160 and 220
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Target Heart Rates During Aerobic Exercise
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If Dahlia exercises in such a way as to expend 300 extra kcalories and reduces her kcaloric intake by 200 kcalories a day, approximately how long will it take Dahlia to lose five pounds?
a) 1 week b) 15 days c) 35 days d) 45 days
Copyright 2010, John Wiley & Sons, Inc.
Which is true regarding maximum heart rate?
a) When a person is fit, it takes less effort to reach his/her maximum heart rate
b) Maximum heart rate declines
with age
c) Maximum heart rate is the number of times that the heart beats per minute while a person it at rest
d) Maximum heart rate is
calculated using one's weight and height
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Components of a Good Exercise Regimen
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Fueling Exercise
Aerobic metabolism is metabolism in the presence of oxygen. Glucose, fatty acids and amino acids are completely broken down to form CO2 and H20 and to produce ATP.
Anaerobic metabolism is metabolism in the absence of oxygen. Each molecule of glucose produces two molecules of ATP. Glucose is metabolized in this way when oxygen cannot be supplied quickly enough to the tissues to support aerobic metabolism.
Anaerobic metabolism is also called anaerobic glycolysis.
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Fueling Exercise by the Minute
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The Process of Anaerobic Metabolism
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The Effect of Exercise Intensity
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A major goal of precompetition meals is to
maximize glycogen stores in the liver
maximize fat stores
maximize activity in the large intestine
increase caffeine in the system
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Nutrient Needs for Physical Activity
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It is recommended that athletes consume diets with the following approximate proportions:
PROTEIN 10 - 15% ; FAT < 10%; CARBOHYDRATE 70 - 80%
PROTEIN 10 - 20%; FAT < 30%; CARBOHYDRATE 55 - 60%
PROTEIN 15 - 22%; FAT < 15%; CARBOHYDRATE 60 - 70%
PROTEIN 12 - 17%; FAT 2 - 5 %; CARBOHYDRATE 80 - 90 %
Copyright 2010, John Wiley & Sons, Inc.
Relationship of Exercise to Intake The source of dietary energy can be as important
as the amount of energy in an athlete’s diet. The general proportion of energy for athletes and
healthy individuals should be: 45-65% total energy from carbohydrates 20-35% from fat 10-35% from protein
Vitamins and minerals requiring special attention from athletes:
B vitamins Antioxidant vitamins, such as vitamins C and E Iron
Sports anemia (blood volume expands to increase oxygen delivery, but the synthesis of Red Blood Cells lags behind._
Calcium Female athlete triad
Too much exercise combined with limited food intake can lead to hormonal abnormalities
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Over-exercise, Under-nutrition Low energy intakes and excessive exercise
in female athletes may result in low levels of the hormone, estrogen that in turn contributes to reductions in bone mineral density
Amenorrhea has the greatest effect on which mineral in a female athlete's body? a) calcium b) fluoride c) iron D) magnesium
Copyright 2010, John Wiley & Sons, Inc.
Copyright 2010, John Wiley & Sons, Inc.
Fluid Needs for Physical Activity During exercise, water is needed to eliminate heat, to
transport oxygen and nutrients to the muscles and to remove waste products such as lactic acid from the muscles.
The ability to dissipate heat depends on hydration levels. At rest in a temperate climate, an adult loses about 4½ cups
of water per day through evaporation from the skin and lungs.
Even with regular consumption, it may not be possible to consume sufficient fluid to remain properly hydrated.
Failure to compensate for fluid losses can result in dehydration.
If heat cannot be lost from the body, body temperature rises and exercise performance as well as health can be jeopardized.
Copyright 2010, John Wiley & Sons, Inc.
Fluid Needs for Physical Activity Dehydration occurs when water loss is great enough for
blood volume to decrease. Dehydration reduces the body’s ability to deliver oxygen
and nutrients to muscles.
Copyright 2010, John Wiley & Sons, Inc.
During hot weather, athletes should consume fluids ___________ exercise.
a) before b) during c) after
d) All answer choices
are correct.
dehydration
Kids and the elderly are much more prone to dehydration… why?
Kids produce more heat Kids are less efficient at transferring heat
from muscle to skin Kids take longer to acclimatize to heat Kids sweat less than adults
Copyright 2010, John Wiley & Sons, Inc.
Copyright 2010, John Wiley & Sons, Inc.
Hyponatremia : abnormally low sodium in the blood
Sports drinks
What should you drink during a long workout?
Beverages containing a small amount of carbohydrate (15-20 grams or 6-8%)
Empty rapidly from the stomach Enhance intestinal absorption Facilitate water retention
500-700 mg sodium/liter for exercise lasting over an hour
Copyright 2010, John Wiley & Sons, Inc.
Copyright 2010, John Wiley & Sons, Inc.
Regarding weight loss in athletes, which is the false statement?
Weight loss of no more than 2 pounds a week is recommended.
Losing weight during the “off” season is usually a better idea than losing weight while training and competing.
Fluid can be safely restricted if energy is also restricted when quick weight loss is desired.
Severe calorie restriction in young female athletes can delay sexual maturation
Copyright 2010, John Wiley & Sons, Inc.
Heat-Related Illnesses
Cold and dehydration
Dehydration may be a concern in the cold.. Why?
Cold air is drier so more evaporative losses from the lungs
Insulated clothing causes sweating Athletes may be reluctant to drink cold
beverages when its cold May limit intake to avoid removing clothing in
order to urinateCopyright 2010, John Wiley &
Sons, Inc.
Copyright 2010, John Wiley & Sons, Inc.
Heat related illness is characterized by all of the following except:
a) decreased blood volume
b) increased blood pressure
c) rise in core body
temperature
d) reduced sweat production
As an athlete…
How much should you drink?
Copyright 2010, John Wiley & Sons, Inc.
Copyright 2010, John Wiley & Sons, Inc.
Recommended Fluid Intake
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32 oz in 1 liter8 oz in 1 cup~4 cups in 1 liter
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Food and Beverages to Maximize Performance
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What Are You Getting From That Sports Bar?
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Evaluating the Benefits and Risks of Ergogenic Supplements
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Claims, Benefits and Risks of Popular Ergogenic Aids
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Claims, Benefits and Risks of Popular Ergogenic Aids
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Caffeine
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Impact of Diet versus Supplements
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Chapter 13
Copyright 2010 John Wiley & Sons, Inc.
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