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Sports Nutrition Health & Nutrition Articles

The following is a selection of articles from past issues of Beck Health & Nutrition's Latest Health News email updates.  Click on a link below or simply use your browser to scroll through each article.  If you would like to subscribe to our free quarterly Latest Health & Nutrition News simply click here.

Ronald Mc Donald the next fitness guru?

Here's one I bet you never expected......Mc Donald’s is looking to reposition Ronald McDonald (yes the clown) as a fitness and health ambassador. A leaner Ronald will encourage McDonald's young consumers to exercise. Ronald, who is known officially within McDonald Corp. as "chief happiness officer," will soon be seen riding a skateboard with a basketball star and kicking a football.

Ronald, the company's newly dubbed "chief happiness officer," has become the company's "ambassador for an active, balanced lifestyle," McDonald's Chief Creative Officer Marlena Peleo-Lazar told a US government panel yesterday. Her announcement came the same week an appeals court reinstated a lawsuit against McDonald's in which two New York teenagers claim they got fat because the company hid the health risks of its food. Other major food companies also are promoting fitness in schools. Last fall, PepsiCo Inc. sent fitness educational materials to elementary schools, reaching 3 million students. In March, the beverage and snack-food company will send another round, this time to all 15,000 middle schools in the country.

These educational programs were discussed at a day-long workshop sponsored by the Institute of Medicine, which Congress directed to study the impact of food marketing on childhood obesity and healthful eating.

The study comes as a growing number of health care professionals and consumer activists are calling for more government oversight of food advertising because the number of obese children has more than doubled in the past 30 years.

Several major food companies are responding to the concerns by reformulating many of their food products and developing or adding new ones to offer more healthful alternatives, such as reduced-sugar cereal. McDonald's, for example, has added milk and apples to its kids' menu. Meanwhile, Kraft announced earlier this month that it will curb advertising of many of its snack foods to children under 12.

The food industry is seeking legislation to block lawsuits, such as the one just reinstated against McDonald's. The Virginia House of Delegates did just that yesterday, strengthening existing law by approving a bill saying state residents can't blame their weight gain on food companies.

In the past, the Ronald McDonald character has visited schools to teach about such issues as bike safety and literacy. Now the clown will be touting physical activity. No burgers or fries will be promoted. "Ronald does not promote food, but fun and activity -- the McDonald's experience," said company spokesman Walt Riker.

The campaign was criticized by Harvard psychologist Susan Linn, author of "Consuming Kids."

"It's just another marketing ploy for McDonald's," she said. "It has no place in the school. The amount of exercise it will take to exercise off everything these kids consume will take all day."

The program has been reviewed and approved by the American Academy of Pediatrics. "We're not endorsing McDonald's or Ronald McDonald, but wanted to make sure the message was safe and appropriate," said Reginald L. Washington, co-chairman of the academy's task force on obesity. The program, he said, "takes advantage of the fact that Ronald McDonald has such recognition with kids that if he tells them to get moving, maybe they will do it."

Source: Caroline E. Mayer, Washington Post, Friday, January 28, 2005.  

City to Surf – Meal plan for Sunday

For those Sydneysiders taking part in the City to Surf fun run this Sunday we have developed a race day nutrition and hydration plan to get you to Bondi in your best time yet. 

Aside from the obvious training, the most important nutritional goals for an event of this type are ensuring adequate hydration and carbohydrate levels before, during and after the race.  

Hydration

Physical activity increases body temperature, increases water loss via sweat, uses-up muscle and liver glycogen stores and can sometimes cause a fall in blood glucose levels.  Numerous studies confirm that exercise performance is impaired when an individual is dehydrated.  The effects of dehydration can begin when an individual is dehydrated by as little as 2% of body weight.  Water losses greater than 5% have been shown to reduce exercise performance by around 30%.     

Dehydration is most evident when the amount of water loss exceeds 3% of body weight.  This dehydration then leads to a fall in endurance, strength, and overall performance.  Dehydration also affects the ‘perception of effort’ experienced as exercise at the same intensity seems progressively ‘harder’ as dehydration worsens. 

Pre-race meal and hydration

Ideally you should consume a carbohydrate-rich breakfast 3-4 hours prior to the race (5:30-6:30am).  For those early risers amongst us here are some pre-race breakfast suggestions:

  • Porridge with low-fat milk and fruit juice

  • Breakfast cereal with milk or yoghurt

  • Pancakes/pikelets with syrup, jam or honey 

  • Toast, muffins or crumpets with jam

  • Rice cakes or bread rolls with sliced banana

  • Fresh fruit or fruit salad

  • Baked beans or spaghetti on toast

  • Banana and honey roll

You should also drink at least 500mL fluid with your pre-race breakfast then continue to consume 150-300mL fluid every 15-20 minutes up until about one hour to 45 minutes before the race (leaving time for a toilet stop before the start). 

For those of you who are not planning on being up quite so early, a pre-race light breakfast or snack 1-2 hours prior to the race could include:

  • Small serving of breakfast cereal, ½ cup of milk, and juice

  • Smoothie based on low-fat milk or soy milk, low-fat yoghurt and mango/banana/berries

  • Fresh fruit or small serving of fruit salad with low-fat yoghurt

  • Low-fat breakfast bar or muesli bar and a banana

  • Sports bar

  • 800-1000 ml of sports drink

  • 500 ml of fruit juice, soft drink or flavoured mineral water

  • 3 medium pieces of fruit or 2 bananas

  • Thick-sliced toast with jam or honey

  • 3 thick rice cakes with jam or honey

  • 2 crumpets with vegemite, jam or honey                                

  • banana jaffle

You should also drink at least 500mL fluid with your pre-race snack then continue to consume 150-300mL fluid every 15-20 minutes up until about one hour to 45 minutes before the race (leaving time for a toilet stop before the start). 

The intake of a large but comfortable volume of fluid (eg. 5mL/kg body weight) just prior to the race can actually help some athletes prepare their stomachs for fluid intake during exercise.  However this is only suggested for those of you who have tried this technique during training and are sure that it won’t cause stomach cramps or lead you straight to the long queue at the port-a-loo. 

Hydration during the race: Sports drinks or water? 

Thirst is not a reliable indicator of adequate hydration during exercise.  During the race try to consume about 150-350mL of sports drink every 15-20 minutes from the start.  Until recently it was considered that carbohydrate intake (such as sports drinks) during exercise would only benefit exercise lasting more than 90 minutes.  However there is a growing body of evidence suggesting that carbohydrate intake can benefit performance in events involving high-intensity exercise of approximately one-hour duration.  Sports drinks provide a valuable source of carbohydrate (sugars/glucose) during exercise and deliver energy to working muscles.  The sodium content of sports drinks also enhances the body’s retention of water. 

Recovery

To ensure effective recovery (replace body fluid and carbohydrate stores) aim to replace fluids by drinking water or sports drinks throughout Sunday afternoon and aim to eat a balanced meal containing carbohydrates, protein and healthy fats within 4 hours of completion of the race.

See you at Bondi!

 

Cold swims make you ravenous

Taking a swim in cold water may be invigorating, but according to new US research it may also increase your appetite enough to contribute to weight gain.   Researchers from the University of Florida compared the energy intake of 11 male volunteers after swimming in warm, then cold water and found that energy intake was 44% higher after exercising in cold water.     

The research authors also suggest that the findings may help to explain why some people find it difficult to lose weight by swimming.

"It's possible that individuals who exercise in cooler water may have an exaggerated energy intake following exercise, which may be a reason why they don't lose as much weight," says Assistant Professor Lesley White.  "So it may not be the exercise itself that causes the problem because you can match the exercise energy expenditure; rather it's the increased eating after the exercise is over."

The research published in the International Journal of Sport Nutrition and Exercise Metabolism reported that student volunteers exercised on a stationary bicycle submerged in water for 45 minutes, in either cold water at 20°C or warm water at 33°C.  The students were then put into a room with food.

"We found that during the recovery period, when the subjects had access to an assortment of foods, that significantly more calories were eaten after exercise in cold water compared to exercise in warm water or at rest," White says.

Source: ABC Science Online

Happiness helps people stay healthy

ImagePeople who are happier in their daily lives have healthier levels of key body chemicals than those who muster few positive feelings, a new study suggests.  This means happier people may have a reduced risk of chronic disease including diabetes. 

Several studies have confirmed the negative impact that depression can have on health.  But few studies have actually focused on the effect of positive mood.  Researchers from University College, London have linked everyday happiness with healthier levels of body chemicals including the stress hormone cortisol.

“This study showed that whether people are happy or less happy in their everyday lives appears to have important effects on the markers of biological function known to be associated with disease,” says clinical psychologist Jane Wardle, one of the research team.

The team studied 216 middle-aged men and women living in London.  Participants were asked to rate how happy they had been feeling in the last five minutes, and at about 33 points during their working or leisure days. At these points, their heart rates and blood pressures were also measured by an automated system.

Saliva samples were taken to test the stress hormone cortisol and one occasion participants were invited into the lab and given a “mildly stressful” task to perform while their biological responses were measured. The team controlled for factors such as socioeconomic position, age and gender to try to tease out the effects of happiness alone on health.

“The happier you were, the lower your cortisol levels during the day,” says Wardle. “For men, but not for women, the happier you were the lower your average heart rate was.”

High levels of cortisol are linked to conditions such as type II diabetes and hypertension. Lower heart rates are associated with cardiovascular health.

In addition, individuals who said they were happy almost all of the time had lower levels of a blood protein called fibrinogen following the stressful task. Fibrinogen makes blood “sticky” and is vital in the clotting process, but high concentrations can indicate future cardiovascular disease problems.

Wardle suggests that the way the brain functions while happy “perhaps makes the little hassles and irritations of everyday life loom less large, so you don’t get such strong reactions to them”.

Source:  Bhattacharya S.  NewScientist.com news service. 18th April 2005.

Bulking up: are protein supplements really necessary?

Walk into any gymnasium and you will understand why most body builders and other strength athletes believe the only way to 'get huge' is to use expensive protein supplements.  The range of powders, bars, shakes etc all promising maximal muscle gain is astounding, but are they actually necessary?

Dietary protein is used by the body to make a wide array of vital body components, including muscle.  However the body does not store protein, therefore the body can only utilise a finite amount of protein each day for muscle growth.  Protein intake recommendations for body builders and athletes wanting to bulk up range from 1.2g/kg/day to an upper level of 2g/kg/day 1,2,3.   So, for example, if an 85kg male was wanting to bulk up, the maximum amount of protein his body would use 170 grams of total protein.  Male body builders generally consume at least this level of protein in their regular diet.     

The average Australian male consumes about 100 grams of protein in his diet each day with a significant amount coming from animal products.  Body builders and other strength athletes however are renowned for overemphasising the importance of protein foods (especially meat, poultry and eggs) with some eating more than 4 grams protein per kilogram of body weight per day, believing that this will further enhance muscle gains 4

Excess dietary protein does not however build bigger muscles, the majority is simply burned by the body as an (expensive) energy source.  Small amounts are also converted to glucose or fat.  Nonetheless body builders are commonly convinced by claims such as 'highest quality protein' and 'food for your muscles' that protein supplements offer muscle gain advantages not available via common food proteins alone. 

Protein quality is an expression of how effectively food proteins meet the essential amino acid requirement to support body growth and maintenance.  Generally speaking, proteins from animal sources (meat, fish, poultry, eggs, dairy products) are considered to be high quality protein because they contain all of the essential amino acids required for body growth and maintenance.  Plant proteins (legumes, nuts, seeds, grains) tend to be lacking in one essential amino acid, meaning that they cannot, by themselves, support protein synthesis (muscle growth).  This is easily overcome by combining different plant proteins. 

In relation to protein supplements what is important to remember is that protein quality is only relevant if dietary protein intake of essential amino acids is inadequate.  Regular consumption of animal proteins (or vegetarian diets that combine different plant proteins each day) provides all of the essential amino acids required for muscle growth.  Additional intakes of essential amino acids and 'highest quality protein' above requirements are simply burned for energy or converted to glucose or fat, regardless of the quality of the protein consumed.       

Key requirements for muscle growth are a progressive resistance training program, adequate energy and protein intake and genetic potential.    

References:1. Lemon PW, Tarnopolsky MA, MacDougall JD, Atkinson SA.  Protein requirements and muscle mass/strength changes during intensive training in novice bodybuilders.  J Appl Physiol 1992;73:767-75. 2.  Wardlaw GM, Hampl JS, DiSilvestro RA, Perspectives in Nutrition 6th Edition, McGraw Hill Higher Education, New York.  2004.3. Tipton KD and Wolfe WR.  Protein and amino acids for athletes.  Journal of Sport Sciences 2004;22:65-79 4. Slater G, Practice Tips, In: Burke L and Deakin V. Clinical Sports Nutrition 2nd Edition. Mc Graw Hill Australia Pty Ltd.  2003.

 

 
Tour de France: Cupcakes on the menu

Cyclists taking place in the Tour de France eat cupcakes to keep their energy up while cycling.  The Tour de France, widely regarded as the most strenuous (and prolonged) sporting endurance endeavour poses unique nutritional challenges for participating cyclists.   The 4000km race takes place over a period of three weeks with only one day allowed for rest and includes 30 mountain passages, the highest reaching an altitude of almost 2700m.  A study of dietary intake of participating cyclists reports that in addition to the expected sports drinks and large meals cupcakes are commonly used to by riders to keep their sugar levels up while riding. 

Source: Saris et al. Study pf food intake and energy expenditure during extreme sustained exercise: The Tour de France, International Journal of Sports Medicine, vol.10, suppl.1, 1989, pp.S26-31.

 

"Everybody wants to know what I am on. What am I on? I'm on my bike... six hours a day. What are you on?"

Lance Armstrong, six-times winner, Tour de France   

 

 

 
Increased metabolism after exercise - does afterburn really exist?
Anyone who has embarked on a weight loss or get-fit program has undoubtedly heard about the benefits of 'afterburn' - the period of time directly after intense exercise where the body continues to burn calories at a higher than normal rate.  Afterburn, or excess post-exercise oxygen consumption (EPOC), is caused during intense exercise.  While exercising at higher intensities your muscles require more oxygen than is normally available so the body redirects oxygen from other areas.  When you finish exercising areas of the body that are low in oxygen work to recover oxygen that they forfeited to the muscles.  The body also needs to cool down and restore hormone balance, all of which requires oxygen.  
 
However the impact of this 'afterburn', or excess post-exercise oxygen consumption (EPOC), is often exaggerated.  Depending on the intensity of the workout EPOC can last from two to 15 hours and amounts to roughly 10 to 15 calories for every 100 calories burned during the actual exercise.  Dr Cedric Byant, chief exercise physiologist for the American Council on Exercise describes it this way "If you go to the gym and burn 300 calories, your afterburn will be about 45 calories. That's one bite of a Snickers bar... People should not look at this as a licence to eat and drink all day thinking that their earlier workout is melting calories away".  The important thing to remember is that the major contribution to weight loss is via the energy expended during the actual exercise - not the afterburn.
 
Source: Briley J, 2005, Afterburn dismissed, The Washington Post, reprinted in The Sydney Morning Herald; Health & Science Supplement, January 13 2005, p.3.                                 
 
 

Exercise causes clumsiness

Those of us who find ourselves staggering about after strenuous exercise tend to blame weary muscles for the problem but it appears it's our brain that's responsible.  Strenuous exercise can lead to clumsiness and difficulty performing skilled movements such as threading a needle.  It seems that the brain works out where our limbs are in space partly by using information it collects on how much effort against gravity it takes to move an arm or a leg into a particular position.  If your limb muscles are tired, that limb is harder to move - and this confuses the brain.  This post exercise clumsiness vanishes as your muscle fibres are repaired.

Young E, 2004, 'Take the fall out of exercise', Sydney Morning Herald, Aug. 19               

 

 

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