Athletic Performance Nutrition Exam 2 Flashcards
What are the macronutrient sources that provide energy for ATP resynthesis during physical activity?
- Liver and muscle glycogen
- triacylglycerols within adipose tissue and active muscle
- skeletal muscle’s amino acids donate their carbon skeletons minus nitrogen
Where is glycogen stored?
Muscle
What is the contribution % of different fuels to ATP for the 200m?
25% Phosphocreatine
65% Anaerobic Glycogen
10% Aerobic Glycogen
What is the contribution % of different fuels to ATP for the 100m?
50% Phosphocreatine
50% Anaerobic Glycogen
What is the contribution % of different fuels to ATP for the 400m?
12.5% Phosphocreatine
65.5% Anaerobic Glycogen
25% Aerobic Glycogen
What is the contribution % of different fuels to ATP for the 800m?
6% Phosphocreatine
50% Anaerobic Glycogen
44% Aerobic Glycogen
What is the contribution % of different fuels to ATP for the 1500m?
25% Anaerobic Glycogen
75% Aerobic Glycogen
What supplies almost all the energy in the transition from rest to moderate physical activity and intense effort?
Glycogen
As PA progresses from low to high intensity does the liver markedly increase glucose release to active muscles?
Yes
When does stored muscle glycogen supply the predominant carb energy source during activity?
The first few minutes & as intensity increases
What remains the preferential fuel during intense aerobic effort because it rapidly supplies ATP during oxidative processes?
Carbohydrates
What is the remainder of the energy supplied by?
Lipid breakdown as intramuscular triacyglycerols contributes up to 20% of total energy expenditure including a small amount of protein
When do carbs become the sole contributor of ATP production?
During anaerobic effort requiring glycolytic reactions
What is carb availability influenced by?
It’s availability in the metabolic mixture and carb intake
When does blood glucose decrease to hypoglycemic levels (<45mg/dL blood)
During 90 minutes of strenuous effort
What are two purposes of increasing carb oxidation by ingesting rapidly absorbed, high-glycemic carbs before activity?
- Blunts long-chain fatty acid oxidation by skeletal muscle
- Blunts free fatty acid (FFA) liberation from adipose tissue during exertion
What induces fatigue despite sufficient oxygen availability to muscles and almost unlimited potential energy in stored lipids during prolonged, intense physical activity?
Dramatically lowered liver and muscle glycogen levels
With strenuous PA, neural -humoral factors increase what 3 hormones & decrease what 1 hormone?
Increase epinephrine, norepinephrine, & glucagon
Decrease insulin release
Aerobically trained muscle exhibits a greater capacity to oxidize carbs than untrained muscle - T/F
True
Why does carb depletion during prolonged exercise coincide with reduced exercise capacity?
- Blood glucose provides energy for the central nervous system
- Muscle glycogen’s role as a “primer” in lipid metabolism
- Slower rate of energy release from lipid catabolism than carb breakdown
What 7 possible factors account for slower rate of lipid vs carbohydrate oxidation?
- FFA mobilization from adipose tissue
- FFA transport to skeletal muscle via circulation
- FFA uptake by muscle
- FFA uptake by muscles from triacylglycerol in chylomicrons & lipoproteins
- Fatty acid mobilization from intramuscular triacylglycerol & cytoplasmic transport
- Fatty acid transport into mitochondria
- Fatty acid oxidation within mitochondria
What are the gender differences that occur in carb metabolism?
Women derive a smaller proportion of total energy from carb oxidation than men during exercise
What identical pathways do carbs & lipid breakdown use?
Acetyl-coenzyme A (COA) oxidation
Do men and women show decreased glucose influx for a given submaximal power output during similar endurance training protocols - T/F
True
Do men or women display an exaggerated shift toward lipid catabolism while following a similar workload?
Women
What does the shift towards lipid catabolism in women suggest?
Endurance training induces greater glycogen sparing at a given sub maximal intensity for women than for men
What does a carb-deficient diet do and affect?
Rapidly depletes muscle and liver glycogen which affects performance in all-out, short-term anaerobic and intense aerobic activities
What do the 5 potential sites for endocrine substrate regulation include?
- Availability via effects on nutrient storage
- Mobilization from body tissue stores
- Uptake at the tissue site of use
- Uptake within tissue itself
- Trafficking among storage, oxidation, & recycling
Are starvation, low-carb, high fats, high protein diets good for exercise?
No, it remains counterproductive for weight control, exercise performance, optimal nutrition, and hood health
Does diet composition profoundly affect glycogen reserves?
Yes
Do active muscles rely on ingested carbs as a readily available energy nutrient?
Yes
What does carb depletion do during exercise?
Exercise intensity decreases to a level governed by how efficiently tissues mobilize and oxidize lipid
Does injury likelihood increase when training & competing with low glycogen reserves?
Yes
Will this gender difference in substrate metabolisms response to training reflect differences in sympathetic nervous system adaptation to regular PA?
Yes
When does fatty acid oxidation occur?
Low-intensity activities. For example, lipid combustion almost totally powers light effort 25% of aerobic capacity
What 3 lipid sources supply the major energy for light to moderate PA?
- Fatty acids
- Plasma triacylglycerols bound to lipoproteins
- Triacylglycerol within active muscle
What % of the energy requirement does intracellular & extracellular lipid supply?
30-80% depending on nutritional & fitness status with exercise intensity & duration
Does lipid use for energy in light & moderate exertion vary closely with blood flow through adipose tissue (a 3-fold increase is not uncommon)?
Yes
What is the contribution % of different fuels to ATP for the 5000m?
12.5% Anaerobic Glycogen
87.5% Aerobic Glycogen
What is the contribution % of different fuels to ATP for the 10000m?
3% Anaerobic Glycogen
97% Aerobic Glycogen
What is the contribution % of different fuels to ATP for the marathon?
75% Aerobic Glycogen
5% Blood glucose (liver glycogen)
20% Triacylglycerol (fatty acids)
What is the contribution % of different fuels to ATP for the ultramarathon?
35% Aerobic Glycogen
5% Blood Glucose
60% Fatty Acids
What is the contribution % of different fuels to ATP for a 24- hour race?
10% Aerobic Glycogen
2% Blood Glucose
88% Fatty Acids
Is the any “one” diet that exists for optimal health and nutrition?
No
What does the protein RDA represent?
A liberal “margin of safety”
What protein is acting as an energy source?
Primarily to the branched-chain amino acids leucine, valine, and isoleucine oxidized in skeletal muscle rather than in liver
How does proper nutrition enhance physical activity?
- Improves overall physical performance
- Optimizes physical conditioning process
- Enhances recovery from fatigue
- Minimizes musculoskeletal injures
What does an optimal diet supply?
Adequate amounts for tissue maintenance, repair, and growth without excess energy intake
The laws of thermodynamics cannot be circumvented - T/F
True
Should you adhere to sound nutritional guidelines with careful planning & food take evaluation?
Yes
What does SAD stand for?
Standard American Diet
What does SAD rely heavily on?
Sugar, lipid, salt, and processed food
What is the energy balance equation?
replenishing the body’s macronutrient energy to modify body weight and body composition
- the balance between energy input (proteins, fats, carbs) & energy output (PA, resting metabolism, TEF)
What do the Guidelines consistently recommend?
The basic principles of a healthful diet - variety, balance, and moderation
When does weight gain occur?
When a long-term positive energy imbalance results from subtle regulatory alterations between energy intake & energy expenditure
Ways Exercise Nutritionists Can Empower Physically Active Individuals and Competitive Athletes
- Educate athletes about the energy requirements for their sport and food’s role in feeling the body
- Assess an athletes’ body size and composition to determine an appropriate weigh
- Assess the athlete’s typical dietary and supplement intake during training, competition, and off-season
- Assess fluid intake and weight loss
- For veg athletes with special nutrition concerns, provide nutritional guidelines to ensure adequate intakes of energy, protein, and micronutrients
- Carefully evaluate any vitamin/mineral or herbal supplements, ergogenic aids, or performance-enhancing drugs
What is the first law of thermodynamics? (Conservation of energy)
Energy cannot be created or destroyed, it can only be transferred to other forms or systems
What are nutritional guidelines for the general population?
- consume a varied diet
- match energy intake to needs
- limit foods high in saturated fats, trans fat, & cholesterol
Specific dietary guideline recommendations for general population
- Restrict total fat to < or =30% of total calories
- Restrict saturated fat to < or =10% of total calories
- Limit the total intake of cholesterol-raising fatty acids (saturated & trans) to < or =10% of calories
- Limit cholesterol intake to < or = 300 mg/d
- replace cholesterol-raising fatty acids with whole grains & unsaturated fatty acids from fish, veggies, legumes, & nuts
- Limit sodium intake to < or =2400mg/d
- If alcohol is consumed, limit intake to 2 drink/day for men, 1 drink/day for women
- Eat at least 2 servings of fish per week
- Eat 5+ servings of veggies and fruits per day
- Eat 6+ servings of grain products per day
- Emphasize daily intake of low-fat or non-fat dairy products
What is desirable blood pressure?
Systolic <140
Diastolic <90
What does the Healthy Eating Plate emphasize?
- The type of carb in the diet than the amount in the diet
- Avoid sugary beverage drinks
- Consumers to use healthy oils, but does not set a max on the percentage of calories people should consume
Figure 7.2, Table 7.2
Pg. 219, 224
Do fruits and veggies occupy half the plate?
Yes
What are the specifics of the alternative plan?
- Eat an abundant variety, but limit potatoes and other high-glycemic starches
- Choose fish, poultry, beans, or nuts
- Use olive, canola, and other plant oils in cooking
- Drink water, tea, or coffee (with little or no sugar) and limit milk and dairy (1-2 servings daily)
Does my plate include recommendations for daily caloric intake, portion size, lipid intake, and energy expenditure?
Yes
Look at Figure 7.6
What are the 7 suggested changes to my plate?
- Provide information that whole grains are better for health than refined grains
- Indicate that some high-protein foods-fish, poultry, beans, nuts-are healthier than red meats & processed meats that often link to various chronic diseases
- Be more insistent on including beneficial lipids as part of a healthy diet
- Differentiate btwn potatoes & other high glycemic veggies that act like sugars in the body
- Reduce dairy intake
- Emphasize the potential negative effect of sugary drinks
- Elevate the importance of daily PA to counter a sedentary lifestyle
What is possible with the Mediterranean diet in term of longevity?
It can slow the rate of cognitive decline for memory and thinking thus slowing down the aging process through antioxidant and anti-inflammatory effects
What is adequate calcium intake?
1000 mg daily 50 and younger
1200 mg above age of 50
What are the 8 strategies the Mediterranean diet emphasizes?
- Substitute olive oil for other lipids & oils including butter and margarine
- Make the goal for total lipid less than 25 to over 35% of energy (cal), with saturated fat not to exceed 7-8%
- Include daily consumption of low to moderate amounts of cheese & yogurt
- Consume low to moderate amounts of fish & poultry twice weekly
- Emphasize fresh fruit as the typical daily dessert, & minimize high-sugar sweets & saturated fats
- Reduce red meat consumption to twice monthly (limit to 12-16oz or 340-450g)
- Increase regular PA at a level that promotes a healthy weight, fitness, & well-being
- Emphasize moderate wine consumption (1-2 for men, 1 for women daily)
Compare all the figure/ food pyramids
Pg 224-227
What is the Diet Quality Index (DQI)
Focus on nutritional elements of a diet considered most important relative to good health and disease prevention
What are the most significant findings in the Aerobics Center Longitudinal Study?
- Progressively lower BMI for men and women with increasing physical fitness levels
- Remarkably small differences in energy intake related to physical fitness classification of women and men, with moderate group consuming the feast calories for both sexes
- Progressively higher dietary fibre intake and lower cholesterol intake across fitness categories
- Men and women with higher fitness levels consumed diets that more closely approached dietary recommendations related to fiber, percentage of energy
Table 7.5 what do the scores mean?
Score of 4 or less reflects a more healthful diet & a score of 10+ pinpoints a less healthful diet requiring improvement
What does research indicate about for teenagers, adults, & competitive athletes who exercise regularly to keep fit?
They don’t require additional nutrients beyond those obtained by consuming nutritionally well-balanced meals
pg 231lists
Table 7.6 and healthy eating index pg. 230
What are the functions and examples of fat replacers?
pg 235
- Provides expected texture and a creamy “mouth-feel” in reduced-fat foods
- Baked goods, dressings, frozen desserts, confections
Pg 232 and 233 understand difference between men and women for different fitness level values
What is the preferred energy source for the anaerobic energy system that it relies on primarily in resistance training?
Carbs
What do food additives do for foods & how many are in the FDA database?
2 types (direct & indirect food additives)
17 additives in FDA database
1. Maintain or improve safety & freshness
2. Improve or maintain nutritional value
3. Improve taste, texture, & appearance
Are there a firm standards for optimal lipid intake? - T/F
False
What does eating a high-carb diet with adequate energy intake do for individuals who train intensely?
It conserves muscle protein in these individuals
What is the lipid intake for good health
Should not exceed 30-35% of diet’s total energy content, with 70% coming from unsaturated fatty acids
Does protein breakdown occur above the resting level during endurance & with resistance training to a degree greater than previously believed?
Yes
Does physical performance benefits occur by reducing lipid intake percentage below 30%
No, the opposite occurs - significant reductions in dietary lipid may compromise exercise performance
How much high-quality protein should those who untertake endurance training & resistance-training consume?
1.2-1.4g/kg body mass daily (endurance)
1.8g/kg body mass (resistance)
How much of an active individual’s daily diet should contain carbs?
55-60%, with it primary starches from unprocessed grains, fruits, and veggies
Does a low-fat diet also blunt the normal rise in plasma testosterone following a short-term resistance exercise bout?
Yes
Table for Nutrient value of whole-wheat vs refined flour
239
Does a low-carb diet rapidly compromise energy reserves for vigorous PA or regular training?
Yes
What carbs do athletes consume during a season (to consume 10g carbs/kg body weight daily)?
- Consume easily digested high-carb drinks or solid foods 1 to 4 hours before training or competition
- Consume an easily digested, high-carb, liquid or solid food contain at least 0.35 to 1.5 g carb . kg body weight per hr immediately after exercise for the first 4 hrs thereafter
- consume a 15 to 25% carb drink or a solid high-carb supplement with each meal
- Maintain a stable body weight during all training phases by matching energy consumption to training’s energy demands to maintain body carb reserves
What difficulties does consuming a low-fat diet during strenuous training create?
Increasing carb & protein intake enough to furnish energy to maintain body weight & muscle mass
What is the general recommendation for daily carb intake?
6-10 kg/body mass daily
What foods are Vitamins A found in?
Organs, meats; carrots; cantaloupe; sweet potatoes; pumpkin; apricots; spinach milk; collards; eggs
What is the minimum time it takes for muscle glycogen levels to replenish following long exhaustive PA?
- 24 hour for long exhaustive PA (liver glycogen restores at a faster rate)
- 1-2 days of rest or lighter effort combined with a high-carb intake reestablishes pre activity muscle glycogen levels following exhaustive workouts or competition
What fraction of Americans take vitamin supplements?
More than1/3
What foods are Vitamins C found in?
Guava, citrus fruits and juices, red-yellow-greens peppers, papaya, kiwi, broccoli, strawberries, tomatoes, sweet and white potatoes, kale, mango, cantaloupe
What foods are Vitamins D found in?
Salmon, tuna, sardines, mackerel, oysters, cold liver oil, egg yolks, fortified milk, fortified orange juice, fortified breakfast cereal
How much of dietary supplements and vitamin/mineral supplement purchases does this 1/3 account for?
1/6 of all dietary supplements
40% of vitamin/mineral supplements
What foods are Vitamins E found in?
Veggie oils, nuts, seeds, spinach, kiwi, wheat germ
What foods are Vitamins K found in?
Spinach, kale, collards, Swiss chard, broccoli, romaine lettuce
What were dietary supplement sales in 2014 & 2017?
Over $36.7 billion in 2014
Over $40 billion in 2017
What foods are Vitamins B1 found in?
Sunflowerseeds, enriched bread, cereal, pasta, whole grains, lean meats, fish, beans, green peas, corn, soybeans
Do supplements improve performance or increase bloods levels of micronutrients when vitamin intakes are achieved?
No, there is no effect on the physical responses to strenuous trining and do not protect against muscle damage from intense physical activity
What % of athletes regularly consumes multivitamin/mineral supplements?
More than 50% of athletes
What can intense & prolonged training produce?
Overtraining, staleness, & burnout
What are overtraining performance symptoms?
- Consistent performance decline
- persistance fatiguer and sluggishness
- excessive recovery required after competitive events
- inconsistent performance
What are overtraining physiologic symptoms?
- decrease in max work capacity
- frequent headaches or stomachaches
- insomnia
- persistent low-grade stiffness & muscle or joint soreness
- frequent constipation or diarrhea
- unexplained loss of appetite & body weight
- amenorrhea
- elevated rhr on waking
What is overtraining associated with?
Associated with sustaining poor exercise performance, frequent infections particularly of upper respiratory tract, general malais, & loss of interest in high-level training & injuries, chronic fatigue
What are psychologic overtraining symptoms?
- depression
- general apathy
- decreased self-esteem
- mood changes
- difficulty concentrating
- loss of competitive drive
Is there a danger in consuming a multivitamin capsule that contains recommend quantities of each vitamin?
No, the concern is those who take megavitamins doses believe that it will have a supercharging effect to improve overall health and general fitness
Which groups often are shown to have vitamin/mineral deficiencies that are apparent?
- Vegetarians or other groups with low energy intake
- Individuals who eliminate one or more food groups from their diet
- Those who consume large amounts of processed foods & simple sugars with low micronutrient density
Are there exercise benefits for intake of VItamin C and E above recommended values?
No
What happens when iron-deficient individuals megadose on Vitamin C?
It may destroy significant amounts of vitamin B12
Does consuming Vitamin C above recommended daily values (75 for women & 90 for men) protect against upper respiratory tract infections?
No
Does moderate PA heighten immune functions?
Yes
Pg 247
Does prolonged periods of intense marathon running or very intense training session suppress & stress the body’s first line of defense against infectious agents?
Yes
What are the 4 proposed mechanisms for selenium’s protection?
- Functions as an essential component of antioxidant enzymes
- Alters carcinogen metabolism and inhibits tumor growth
- Affects endocrine and immune systems
- Acts through molecular mechanisms to regulate apoptosis, cellular programmed death or regulated cell suicide of damaged precancerous cells
Italicized on pg 246
What questions arise concerning free radical production & PA?
- Are physically active individuals more prone to from radical damage?
- Are nutritional agents with antioxidant properties required in increased quantities by the physically active person?