Sports Drinks
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Depletion of the body's carbohydrate stores and dehydration are two factors
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that will limit prolonged exercise.
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Anatomy & Physiology
Sweating is the way in which the body maintains its core temperature at 37
degrees centigrade. This results in the loss of body fluid and electrolytes
(minerals such as chloride, calcium, magnesium, sodium and potassium) and
if unchecked will lead to dehydration and eventually circulatory collapse and
heat stroke. The effect of fluid loss on the body is as follows (Rehrer 1994)[1]:
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Electrolytes
Electrolytes serve three general functions in the body:
many are essential minerals
they control osmosis of water between body compartments
they help maintain the acid-base balance required for normal cellular
activities
The electrolyte composition of sweat is variable but comprises of the following
components:
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A litre of sweat typically contains 0.02g Calcium, 0.05g Magnesium, 1.15g
Sodium, 0.23g Potassium and 1.48g Chloride. This composition will vary from
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person to person (Hamilton 2005)[2].
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Physiological Effect
Glucose
Carbohydrate is stored as glucose in the liver and muscles and is the most
efficient source of energy as it requires less oxygen to be burnt than either
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Protein or fat. The normal body stores of carbohydrate in a typical athlete are:
70kg male athlete - Liver glycogen 90g and muscle glycogen 400g
60kg female athlete - Liver glycogen 70g and muscle glycogen 300g.
During hard exercise, carbohydrate can be depleted at a rate of 3-4 grams per
minute. If this is sustained for 2 hours or more, a very large fraction of the
total body carbohydrate stores will be exhausted and if not checked will result
in reduced performance.
Recovery of the muscle and liver glycogen stores after exercise will normally
require 24-48 hours for complete recovery.
During exercise, there is in an increased uptake of blood glucose by the
muscles and to prevent blood glucose levels falling the liver produces glucose
from the liver stores and lactate.
Consuming carbohydrate before, during and after exercise will help prevent
blood glucose levels falling too low and help maintain the body's glycogen
stores. Many athletes cannot consume food before or during exercise and
therefore a formulated drink that will provide carbohydrate is required.
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Two main factors affect the speed at which fluid from a drink gets into the
body:
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the speed at which it is emptied from the stomach
the rate at which it is absorbed through the walls of the small intestine
The higher the carbohydrate levels in a drink the slower the rate of stomach
emptying. Isotonic drinks with a carbohydrate level of between 6 and 8% are
emptied from the stomach at a rate similar to water. Electrolytes, especially
sodium and potassium, in a drink will reduce urine output, enable the fluid to
empty quickly from the stomach, promote absorption from the intestine and
encourage fluid retention (Unknown 1993)[3].
What's wrong with water?
water causes bloating which will suppress thirst and therefore drinking
water contains no carbohydrate or electrolytes
Calculating personal fluid needs
During an endurance event, you should drink just enough to be sure you lose
no more than 2% of pre-race weight. This can be achieved in the following
way:
Record your naked body weight immediately before and after a number
of training sessions, along with details of distance/duration, clothing and
weather conditions
Add the amount of fluid taken during the session to the amount of
weight lost - 1 kilogram (kg) is roughly equivalent to 1 litre of fluid (1lb
approx. 0.5 litre)
After a few weeks you should begin to see some patterns emerging and
can calculate your sweat rate per hour
Once you know what your sweat losses are likely to be in any given set
of environmental conditions, you can plan your drinking strategy for any
particular event
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Sports Drinks
There are three types of sports drink all of which contain various levels of
fluid, electrolytes and carbohydrate.
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Type
Isotonic
Content
Fluid, electrolytes and 6 to 8% carbohydrate
Mental Imagery
Hypotonic Fluids, electrolytes and a low level of carbohydrate
SCAT
Hypertonic High level of carbohydrate
TEOSQ
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The osmolality of a fluid is a measure of the number of particles in a solution.
In a drink, these particles will comprise of carbohydrate, electrolytes,
sweeteners and preservatives. In blood plasma the particles will comprise of
sodium, proteins and glucose. Blood has an osmolality of 280 to
330mOsm/kg. Drinks with an osmolality of 270 to 330mOsm/kg are said to be
in balance with the body's fluid and are called Isotonic. Hypotonic fluids have
fewer particles than blood and Hypertonic have more particles than blood.
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Consuming fluids with a low osmolality, e.g. water, results in a fall in the
blood plasma osmolality and reduces the drive to drink well before sufficient
fluid has been consumed to replace losses.
Which is most suitable?
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Isotonic - quickly replaces fluids lost by sweating and supplies a boost of
carbohydrate. This drink is the choice for most athletes - middle and long
distance running or team sports. Glucose is the body's preferred source of
energy therefore it may be appropriate to consume Isotonic drinks where the
carbohydrate source is glucose in a concentration of 6% to 8% - e.g. High
Five, SiS Go, Boots Isotonic, Lucozade Sport.
Hypotonic - quickly replaces fluids lost by sweating. Suitable for athletes who
need fluid without the boost of carbohydrate e.g. jockeys and gymnasts.
Hypertonic - used to supplement daily carbohydrate intake normally after
exercise to top up muscle glycogen stores. In ultra distance events, high
levels of energy are required and Hypertonic drinks can be taken during
exercise to meet the energy demands. If used during exercise Hypertonic
drinks need to be used in conjunction with Isotonic drinks to replace fluids.
Want to make your own?
Isotonic - 200ml of orange squash (concentrated orange), 1 litre of water and
a pinch of salt (1g). Mix all the ingredients together and keep chilled
Hypotonic - 100ml of orange squash (concentrated orange), 1 litre of water
and a pinch of salt (1g). Mix all the ingredients together and keep chilled.
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Hypertonic - 400ml of orange squash (concentrated orange), 1 litre of water
and a pinch of salt (1g). Mix all the ingredients together and keep chilled.
Dental Health
Sports drinks commonly contain citric acid. All acids have an erosive potential
but the method of drinking will influence whether or not those acids affect the
teeth. Sports drinks should be consumed as quickly as possible, preferably
with a straw and not be held or swished around the mouth. Retaining drinks in
the mouth will only increase the risk of erosion. Refrigerated drinks will have a
reduced erosive potential, as the acid dissolution constant is temperature
dependant (Milosevic et al. 1997)[4].
Food for thought
In a trial conducted by scientists in the city of Aberdeen it was determined
that a 2% carbohydrate-electrolyte drink provided a more effective combat to
exercise fatigue in a hot climate when compared to a 15% carbohydrateelectrolyte mixture (Galloway and Maughan 2000)[5].
Seven Rules of Hydration (Troop 1994)[6]
1. The rate of passage of water from your stomach into your small
intestine depends on how much fluid is actually in your stomach. If
there is lots of water there, fluid flow from stomach to intestine is like a
springtime flood; if there is little water, the movement resembles a
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Sports Drinks
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7.
lightly dripping tap. Therefore, to increase stomach-intestinal flow (and
overall absorption of water) you need to deposit a fair amount of liquid
in your stomach just before you begin your exercise. In fact, 10-12
ounces of fluid is a good start. This will feel uncomfortable at first, so
practice funnelling this amount of beverage into your "tank" several
times before an actual competition.
To sustain a rapid movement of fluid into your small intestine during
your exertions, take three to four sips of beverage every 10 minutes if
possible, or five to six swallows every 15 minutes.
If you are going to be exercising for less than 60 minutes, do not worry
about including carbohydrate in your drink; plain water is fine. For
exercise that is more prolonged you will want the carbohydrate.
Years of research have suggested that the correct concentration of
carbohydrate in your drink is about 5 to 7%. Most commercial sports
drinks fall within this range, and you can make your own 6% drink by
mixing five tablespoons of table sugar with each litre of water that you
use. A bit of sodium boosts absorption; one-third teaspoon of salt per
litre of water is about right. Although 5 to 7% carbohydrate solutions
seem to work best for most individuals, there is evidence that some
endurance athletes can fare better with higher concentrations. In
research carried out at Liverpool John Moores University, for example,
cyclists who ingested a 15% maltodextrin solution improved their
endurance by 30 per cent compared to individuals who used a 5%
glucose drink. The 15% drink also drained from the stomach as quickly
as the 5% one, though many other studies have linked such
concentrated drinks with a slowdown in water movement.
A 6% "simple sugar" drink will empty from your stomach at about the
same rate as a fancy 6% "glucose polymer" beverage, so do not fall for
the idea that the latter can boost water absorption or enhance your
performance more than the former, and don't pay more for the glucosepolymer concoction.
Contrary to what you have heard, cold drinks are not absorbed into your
body more quickly than warm ones. However, cold drinks are often
more palatable than warm ones during exercise, so if coldness helps you
to drink large quantities of fluid while you exert yourself, then keep your
drinks cool.
Swilling drinks during exercise does NOT increase your risk of digestivesystem problems. In actuality, most gut disorders that arise during
exercise are caused by dehydration, not from taking in fluid.
Dehydration induces nausea and discomfort by reducing blood flow to
the digestive system, so keep drinking!
Water Intoxication
Intracellular fluid and interstitial fluid have the same osmotic pressures under
normal circumstances. The principal cation inside the cell is Potassium and the
principal cation outside the cell is Sodium. A fluid imbalance between these
two compartments is caused by a change in the Potassium or Sodium
concentration. Sodium balance in the body is controlled by aldosterone and
antidiuretic hormone (ADH). ADH regulates extracellular fluid electrolyte
concentration by adjusting the amount of water reabsorbed into the blood by
the kidneys. Aldosterone regulates extracellular fluid volume by adjusting the
amount of sodium reabsorbed by the blood from the kidneys.
Certain conditions may result in a decrease in the sodium concentration in
interstitial fluid. For instance, during sweating the skin excretes sodium as
well as water. If we replace the lost fluid with plain water then we may
produce a sodium deficit. The decrease in sodium concentration in the
interstitial fluid lowers the interstitial fluid osmotic pressure and establishes an
effective water concentration between the interstitial fluid and the intracellular
fluid. Water moves from the interstitial fluid into the cells, producing two
results that can be quite serious:
The first result, an increase in intracellular water concentration, called
over hydration which disrupts nerve cell function. In severe over
hydration we may see disoriented behaviour, convulsions, coma, and
even death
The second result is a loss of interstitial fluid volume that leads to a
decrease in the interstitial fluid pressure. As the pressure drops, water
moves out of the plasma, resulting in a loss of blood volume that may
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Sports Drinks
http://www.brianmac.co.uk/drinks.htm
lead to circulatory shock.
Alcohol
Alcohol is a high octane fuel but it cannot be metabolised to provide energy
except in the liver and then only at a very slow rate. Energy provided by
alcohol tends to be converted to fat and excessive consumption may cause
liver damage. As a diuretic it will cause dehydration and evidence suggests
that vitamin B and C may be depleted. Excessive alcohol will diminish aerobic
capacity and impair motor function.
Referenced Material
1. REHRER, N.J. (1994) The Maintenance of Fluid Balance during Exercise.
International Journal of Sports Medicine, vol. 15(3), p. 122-125
2. HAMILTON, A. (2005) Sports Drinks or water: What is the best choice
for sports performers. Peak Performance, 212, p.1-5
3. UNKNOWN (1993) The Effect of Different Forms of Fluid Provision on
Exercise Performance. International Journal of Sports Medicine, 14, p.
298
4. MILOSEVIC, A. and KELLY, M.J. and McLEAN, A.N. (1997) Sports
supplement drinks and dental health in competitive swimmers and
cyclists. British Dental Journal 182, p. 303-308
5. GALLOWAY, S.D.R. and MAUGHAN, R.J. (2000) The effects of substrate
and fluid provision on ermoregulatory and metabolic responses to
prolonged exercise in a hot environment. Journal of Sports Sciences, 18
(5), p. 339-351
6. TROOP, R. (1994) Drink your way to winning performances: the seven
secrets of hydration, Peak Performance (August 1994), p. 11-12
Page Reference
The reference for this page is:
MACKENZIE, B. (2000) Sports Drinks [WWW] Available from:
http://www.brianmac.co.uk/drinks.htm [Accessed 8/4/2013]
Associated Pages
The following Sports Coach pages should be read in conjunction with this
page:
Articles on Nutrition
Eating Disorders
Glycaemic Index
Healthy Eating
Nutrition
Nutritional Tips
Additional Sources of Information
For further information on this topic see the following:
BEASHEL, P. & TAYLOR, J. (1996) Advanced Studies in Physical
Education and Sport. UK: Thomas Nelson & Sons Ltd.
DAVIS, B. et al. (2000) Physical Education and the Study of Sport. UK:
Harcourt Publishers Ltd.
McARDLE, W. et al. (2000) Essentials of Exercise Physiology. 2nd ed.
Philadelphia: Lippincott Williams & Wilkins
BEASHEL, P. & TAYLOR, J. (1997) The World of Sport Examined. UK:
Thomas Nelson & Sons Ltd.
GALLIGAN, F. et al. (2000) Advanced PE for Edexcel. Oxford;
Heinemann Educational Publishers
BIZLEY, K. (1994) Examining Physical Education. Oxford; Heinemann
Educational Publishers
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