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OLYMPIC GAMES TOKYO 2020
Beat The Heat during the
Olympic Games Tokyo 2020
10 TOP TIPS
1. eat acclimatisation by training in the
H 6. o not use clothing that limits sweat
D
heat for at least two weeks. [see p. 7, 9] evaporation. [see p. 14]
2.
If you cannot acclimatise for two weeks, 7. any medications can impair your
M
try at least one week! [see p. 8, 10] ability to tolerate heat, so discuss your
medications with your sports physician.
3.
Implement your hydration plan starting
in the days preceding the event. 8. iarrhoea and vomiting impair your
D
[see p. 11–13] hydration status and will require the use
of Oral Rehydration Solutions (ORS).
4. se pre-cooling strategies during your
U
warm-up (e.g. ice vest). [see p. 14] 9. se a non-greasy sunscreen.
U
[see p. 14]
5.
Test your cooling strategies during
practice prior to the event/competition. 10. se a hat and Category 3 sunglasses.
U
[see p. 14] [see p. 14]
2
Beat The Heat during the
Olympic Games Tokyo 2020
The Games of the XXXII Olympiad Tokyo
2020 (24 Jul – 9 Aug) will take place in 34 92
32
hot and humid environmental conditions. 88
30
84
Hot and humid ambient conditions limit 28
80
heat dissipation capacity during exercise, 26
24 76
thus impairing endurance performance
22 72
and increasing the risk of exertional
20 68
heat illness such as heat cramps, heat 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
exhaustion and heat stroke. Hour (local)
The risk of heat-related illness can be
reduced by adopting countermeasures 95
such as heat acclimatisation. 90
Relative Humidity (%)
85
This document addresses some
80
“Frequently Asked Questions” 75
about performing in hot and humid 70
ambient conditions and provides 65
recommendations to optimise 60
performance and reduce the risk 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
of heat illness. Hour (local)
Figure 1: Typical Tokyo weather during 24 July – 9 August Olympic period
(Tokyo airport average data from 1998–2018)
3
How is body temperature maintained?
Figure 2: The athletes’ thermal environment
The ambient conditions during When resting in temperate
Radiation
sporting events are generally environmental conditions, core
determined using the Wet-Bulb- body temperature in humans is
Globe-Temperature (WBGT) index. around 37ºC, while muscle and
The WBGT is calculated from skin temperature is approximately
the dry (standard thermometer) 35ºC and 31ºC, respectively. During
(solar radiation – direct or
reflected towards the athlete)
(evaporative heat loss by
radition from the body) temperature, the wet-bulb physical exertions, such as running
temperature (indicative of the true or race-walking, muscle contractions
capacity of the air to evaporate produce a considerable amount of
Convection water according to its relative heat, inducing a large increase in
(requires air flow at a lower
temperature than the skin for humidity and air velocity) and the muscle temperature which drives an
negative cooling effect)
solar radiation (globe temperature). increase in core body temperature.
Thus, both a hot and dry (e.g. The heat produced is dissipated
37ºC, 25% relative humidity as into the environment via the skin
during the 2016 UCI Road World through sensible (i.e. convection and
Sweat evaporation Championships in Qatar) or a warm radiation) and insensible evaporation
(main avenue for heat dissipation
in the exercising human) and humid (e.g. 28ºC, 75% relative heat loss pathways, primarily in the
humidity as during the 2014 FIFA form of sweating. In hot ambient
World Cup in Brazil) environment conditions, the gradient between
can produce the same WBGT (27ºC). skin and environmental temperature
Metabolic production
(¼ of the energy is converted is minimal, possibly even negative,
into mechanical work,
¾ is converted into heat) such that heat dissipation occurs
mainly through sweat evaporation.
BEAT THE HEAT DURING THE OLYMPIC GAMES TOKYO 2020 4
How does heat affect performance?
Figure 3: The effect of temperature on running performance
An increase in muscle temperature (e.g. through
warm-up) has several benefits for explosive athletic
performance such as sprints, jumps and throws.
1.0
However, preventing an excessive rise in core body
temperature during prolonged exercise requires
0.5 transferring metabolic heat from the working
muscles and core to the skin and then dissipating
Change in performance >25°C versus
What is the normal body temperature
response during exercise?
Figure 4: Maximal body core temperature when competing in the heat
Body temperature increases after a few minutes
of exercise. The heat dissipation capacity of the
environment is determined by air temperature,
radiant temperature, humidity and air velocity.
The athlete’s personal potential for heat loss is
determined by their acclimatisation status, sweat
rate, clothing and fitness. The environment together
Core with the individual athlete’s potential for heat loss
will determine to what extent their core temperature
Body temperature will increase.
can reach between Core temperature will keep rising during exercise
unless heat production is reduced (e.g. reduce
39–410C speed). Depending on the intensity and duration of
the exercise, a plateau in body temperature may
occur anywhere around 38.5–40ºC when exercising
in temperate environments.
However, athletes can transiently achieve a core
body temperature above 41ºC when competing
intensely in hot ambient conditions.
BEAT THE HEAT DURING THE OLYMPIC GAMES TOKYO 2020 6How best to prepare for competition
in the heat
Figure 5: Adaptations to repeated training in
the heat for unacclimatised athletes The best way to prepare for It is therefore recommended
competition in the heat is to that athletes train in a similar
train in the heat (i.e. to heat environment to that in which
120 acclimatise). Heat adaptation competition will occur,
Exercise Capacity
is achieved via repeated commencing heat adaptation
Thermal Comfort
exercise/heat exposure that at least two weeks prior to
increases body core and competition.
Adaptation (% Day 1)
Sweating Rate
skin temperature, as well as
Skin Temperature
inducing significant sweating. Conducting an initial heat
acclimatisation camp several
100 Core Temperature
This adaptation to the weeks before the target event
heat Heart
can be achieved using
Rate may also enhance the rate
hot ambient conditions of adaptation to the heat in
Plasma Volume
(i.e. acclimatisation) or a follow-up pre-competition
by simulating hot ambient camp. The most visible body
conditions using purpose- adaptations to repeated
80 built environmental chambers training in the heat include
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
or improvised low-tech “hot an increased sweat rate,
120 Days of Heat Acclimation rooms” (i.e. acclimation). a decreased heart rate at
Exercise Capacity
Thermal Comfort The number of days required a given intensity, a better
to achieve optimal adaptation retention of electrolytes,
Adaptation (% Day 1)
Sweating Rate
Skin Temperature varies between individuals, and a decreased body
100 Core Temperature but most adaptations tend core temperature.
Source: Périard, J. D., Racinais, S. & Sawka, M. N. Scand Heart Rate TT in the
to develop heat7–10
within without training in the heat
days,
350Sci Sports 25, 20–38 (2015).
J Med Plasma Volume with 14 days being optimal
TT in the heat after 1 week of training in the heat
for most.
80
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 TT in the heat after 2 weeks of training in the heat
300
Days of Heat Acclimation
TT in cool environment
er output (W)
BEAT THE HEAT DURING THE OLYMPIC GAMES TOKYO 2020 7
TT in the heat without training in the heat
350
TT in the heat after 1 week of training in the heatThermal Comfort
Adaptation (% Day 1)
Sweating Rate
How much can performance be
120
Exercise Capacity Skin Temperature
Thermal Comfort
100 Core Temperature
Adaptation (% Day 1)
Sweating Rate
improved by heat acclimatisation?
100
Skin Temperature
Core Temperature
Heart Rate
Heart Rate
Plasma Volume
Plasma Volume
80 80
0 1 2 3 04 51 6 27 8 3 9 10
4 11 512 136 14 7 8 9 10 11 12 13 14
Figure 6: The impact
Days of of heat acclimatisation on cycling
Heat Acclimation
Days of Heat Acclimation
time trial (TT) performance in the heat Heat stress can dramatically decrease endurance
performance, but this reduction in performance
TT in the heat without training in the heat can be mitigated progressively with heat
350
TT in the heat after 1 week of training in the heat acclimatisation. Heat acclimatisation is an ideal
TT in the heat after 2 weeks of training in the heat adjunct to other performance-enhancing strategies
TT in the heat
(e.g. without training
high-altitude in theHeat
training). heatacclimatisation
300 350 TT in cool environment
willheat
alsoafter
reduce the of
risk of heat-related
in the heatillness.
Power output (W)
TT in the 1 week training
250
If the
TT in the heatsigns
afterand symptoms
2 weeks of heat-related
of training in the heat illness
develop then:
300 TT in cool environment
• Call for medical assistance
Power output (W)
200
10 20 30 40 50 60 70 80 90 100
Percent distance completed (43km)
• R
emove the individual from the heat source
(e.g. from out of the sun to shade)
250
• Where possible start active cooling
Therefore, heat acclimatisation should be a
priority before any event where hot and/or humid
200 conditions are likely or expected. Indeed, heat
10 20 30 40 50 60 70 80 90 100
acclimatisation does not impair performance
Percent distance completed (43km) in cooler environments and may even enhance
performance under certain conditions.
Source: Racinais, S., Périard, J. D., Karlsen, A. & Nybo,
L. Med Sci Sports Exerc 47, 601–606 (2015).
BEAT THE HEAT DURING THE OLYMPIC GAMES TOKYO 2020 8How to heat acclimatise in a cold country
Figure 7: The different heat acclimatisation methods HEAT
There are a wide variety of overall benefits of passive
ACCLIMATISATION approaches that can increase ACCLIMATION heat acclimation will be
HEAT Natural Environment core and skin temperature less than training in hot
Artificial Environment
(outdoor/field training) and stimulate sweating. (indoor/laboratory training) conditions. Water
ambient
ACCLIMATISATION ACCLIMATION temperature should be
Natural Environment Artificial Environment The first choice should be
(outdoor/field training) (indoor/laboratory training) around 40ºC in order to elicit
to train for 60–90 minutes
adaptation while remaining
SELF-PACED CONSTANT a day CONTROLLED
in the same ambient CONTROLLED PASSIVE
EXERCISE WORK RATE conditions INTENSITY HYPERTHERMIA tolerableHEATING
(this can easily be
as the upcoming
SELF-PACED CONSTANT CONTROLLED CONTROLLED PASSIVE measured with a floating
EXERCISE WORK RATE INTENSITY HYPERTHERMIA HEATING competition for two weeks.
pool thermometer).
However, if this is not
possible, most adaptations Another approach to induce
can be acquired by artificially heat adaptation is to
ACTIVITY ACTIVITY ACTIVITY ACTIVITY
ACTIVITY ACTIVITY ACTIVITY simulating
ACTIVITY heat during indoor
ACTIVITY wear extra ACTIVITYclothing during
Football, running, etc. Walking at 6km/h,
running at 12km/h,
Cycle ergometer at
65% VO2max heart rate
Work +/– Rest to
Football, running,
maintain core
etc. Water immersion,
Walking at 6km/h,
or sauna bathing
running at 12km/h,
trainingCycle (i.e. use
ergometer at of a purpose-
Work +/– Rest to trainingWater
maintain core
to increase
immersion,
or sauna bathing
the
cycle ergometer at 185 W temperature at 38.5°C 65% VO heart rate
CONDITIONS (e.g. 145 bpm)
CONDITIONS CONDITIONS
cycle ergometer at 185 W built environmental
2max
(e.g. 145 bpm) chamber
temperature at heat stimulus. Collectively,
38.5°C
Outdoor (variable) CONDITIONS CONDITIONS CONDITIONS Water 40–42°C CONDITIONS
Indoor (40°C, 40%RH) Outdoor (variable)
Indoor (40°C, 40%RH)
Indoor (40°C, 40%RH)
Outdoor (variable)
Indoor (40°C, 40%RH) CONDITIONS if available,
Sauna 70–90°C
CONDITIONS or even using
CONDITIONS artificialWater
techniques
40–42°C aimed
Indoor (40°C, 40%RH) Outdoor (variable)
DURATION
60–90 MINS DURATION DURATION DURATION
DURATION Indoor (40°C, 40%RH)
heatersIndoorand boiling
(40°C, 40%RH) water
Indoor (40°C, 40%RH)at inducing heat
Sauna 70–90°C adaptation
DURATION
45–60 MINS, or
60–90 MINS 60–90 MINS 60–90 MINS intermittent for 30 MINS to artificially create hot and are called “heat acclimation”.
DURATION
60–90 MINS DURATION DURATION DURATION
60–90 MINS humid ambient
60–90 MINS conditions).
60–90 MINS Although notfor as
45–60 MINS, or
intermittent specific as
30 MINS
exercise heat acclimatisation,
It is also possible to use
heat acclimation can be
passive heat acclimation
used before travelling
techniques such as hot
Source: Daanen, H. A. M., Racinais, S. & Périard, to a hot environment to
water immersion or sauna
J. D. Sports Med 48, 409–430 (2018). reduce the time required for
bathing for 30–40 minutes
acclimatisation upon arrival.
pre- or post-training, but the
BEAT THE HEAT DURING THE OLYMPIC GAMES TOKYO 2020 9When to heat acclimatise
Figure 8: Examples of heat acclimatisation strategies, HEAT
depending on travel requirements Despite the benefits of heat
ACCLIMATISATION ACCLIMATION
acclimatisation, only 15% of
Natural Environment athletes
Artificial participating in the 2015
Environment
(outdoor/field training) (indoor/laboratory
IAAF Worldtraining)
Championships
2 WEEKS’ ACCLIMATISATION BEFORE TRAVELLING
ACCLIMATISED
(Beijing) which were held in a hot
at time of competition
and humid environment, prepared
ACCLIMATISATION IN ADVANCE + MAINTENANCE 1 SESSION/WEEK specifically by training in the heat
SELF-PACED CONSTANT CONTROLLED CONTROLLED PASSIVE
EXERCISE WORK RATE INTENSITY prior to competition.
HYPERTHERMIA HEATING While some
ACCLIMATISED
at time of competition degree of heat acclimatisation
does occur by regular training
PRE-ACCLIMATION + 1 WEEK ACCLIMATISATION UPON ARRIVAL
even in cool conditions, the most
ACCLIMATISED
at time of competition
effective method to obtain all
the heat adaptation benefits is
2 WEEKS’ ACCLIMATISATION UPON ARRIVAL ACTIVITY ACTIVITY ACTIVITY ACTIVITY
to train in conditions ACTIVITY similar to
Football, running, etc. Walking at 6km/h, Cycle ergometer at Work +/– Rest to Water immersion,
running at 12km/h, 65% VO2max heart rate
ACCLIMATISED the upcoming competition (using
maintain core or sauna bathing
cycle ergometer at 185 W at time of competition temperature at 38.5°C
CONDITIONS (e.g. 145 bpm)
either real or simulated
CONDITIONS conditions).
Outdoor (variable) CONDITIONS CONDITIONS CONDITIONS Water 40–42°C
Indoor (40°C, 40%RH) Outdoor (variable)
Indoor (40°C, 40%RH)
Indoor (40°C, 40%RH) Travel
Indoor to the competition
(40°C, 40%RH) Sauna 70–90°C should be
-8 -7 -6 -5 -4 -3DURATION
-2 -1 Competition planned to ensure optimum heat
DURATION
60–90 MINS DURATION DURATION DURATION
Number of weeks before competition 60–90 MINS 60–90 MINS adaption
60–90 MINS and intermittent
taking forinto
45–60 MINS, or
account
30 MINS
the competition schedule.
BEAT THE HEAT DURING THE OLYMPIC GAMES TOKYO 2020 10How does hydration impact on performance?
Figure 9: Dehydration level when competing in the heat HEAT
Heat dissipation relies on sweat
ACCLIMATISATION ACCLIMATION
evaporation. However, profuse sweating
Natural Environment may leadEnvironment
Artificial to progressive dehydration
(outdoor/field training) if(indoor/laboratory
fluids are not training)
sufficiently replaced.
Severe dehydration accelerates the rise
in whole-body temperature and impairs
prolonged exercise performance. This
SELF-PACED CONSTANT CONTROLLED CONTROLLED PASSIVE
EXERCISE WORK RATE INTENSITY reduction in performance
HYPERTHERMIA HEATINGoccurs as
dehydration negatively impacts the
normal functioning of the heart by
making it more difficult to maintain
blood pressure and blood flow to the
working muscles and skin (to lose heat).
ACTIVITY ACTIVITY ACTIVITY ACTIVITY a sufficient
Therefore, ACTIVITYintake of fluids
Football, running, etc. Walking at 6km/h, Cycle ergometer at Work +/– Rest to Water immersion,
running at 12km/h, 65% VO2max heart rate before, during and afterbathing
maintain core or sauna exercise is
cycle ergometer at 185 W temperature at 38.5°C
CONDITIONS (e.g. 145 bpm)
necessary for athletes CONDITIONS to perform well
Outdoor (variable) CONDITIONS CONDITIONS and stay safe when
CONDITIONS competing
Water 40–42°C in hot
Indoor (40°C, 40%RH) Outdoor (variable)
Indoor (40°C, 40%RH) Indoor (40°C, 40%RH) Sauna 70–90°C
Indoor (40°C, 40%RH) and humid ambient conditions.
DURATION DURATION
Dehydration
60–90 MINS DURATION DURATION DURATION 45–60 MINS, or
60–90 MINS 60–90 MINS 60–90 MINS intermittent for 30 MINS
can range between
2–8%
BEAT THE HEAT DURING THE OLYMPIC GAMES TOKYO 2020 11How much to drink
Figure 10: What colour is your urine? HEAT
Drinking to satisfy thirst is maximum of about 1.2 L/h).
ACCLIMATISATIONadequate for exercise lastingACCLIMATION It is also important to recognise
Natural Environment less than one to two hours inArtificial Environment that hydration regimens should
(outdoor/field training)
cool environments. Planned(indoor/laboratory nevertraining)
result in significant over-
drinking may enhance sporting hydration, as this can have
WELL HYDRATED performance during activities serious health consequences
lasting more than 90 minutes, (so called “hyponatremia”,
SELF-PACED CONSTANT CONTROLLED CONTROLLED PASSIVE
EXERCISE WORK RATE particularly during
INTENSITY high-intensity
HYPERTHERMIA an imbalance HEATING of the salts in
FAIRLY WELL HYDRATED exercise in the heat that elicits the body) that can be more
high sweat rates (and when severe than dehydration and
carbohydrate intake of 1 g/min even result in death. Simple
DEHYDRATED or more is desired). Individuals techniques such as measuring
with high sweat rates and/or body mass before and after
ACTIVITY ACTIVITY ACTIVITY
those concerned with exercise ACTIVITY exercise or ACTIVITY
evaluating urine
Football, running, etc. Walking at 6km/h, Cycle ergometer at Work +/– Rest to Water immersion,
VERY DEHYDRATED running at performance
12km/h, 65% VO should
2max
heart rate determine
maintain colour in the
core or morning
sauna bathing (first
cycle ergometer at 185 W temperature at 38.5°C
CONDITIONS (e.g. 145 bpm)
sweat rates under conditions void) canCONDITIONS
help athletes assess
Outdoor (variable) CONDITIONS
Indoor (40°C, 40%RH) Outdoor (variable) intensity, speed) CONDITIONS
(exerciseCONDITIONS and fluid losses through sweating
Water 40–42°C
Sauna 70–90°C
Indoor (40°C, 40%RH) Indoor (40°C, 40%RH)
SEVERELY DEHYDRATED
DURATION
ambient conditions similar
Indoor (40°C, 40%RH)
and estimate hydration needs
to that anticipated DURATION
60–90 MINS DURATION DURATIONwhen DURATION and status. It MINS,
45–60 is ofor paramount
60–90 MINS
competing, and tailor drinking
60–90 MINS 60–90 MINS
importance that athletes
intermittent for 30 MINS
to prevent body mass losses establish their optimal personal
exceeding 2–3% in general. drinking strategies during
training and well before arriving
Individualised prescription of
at the competition.
fluids must remain within the
limits of how much fluid can
be absorbed (i.e. typically a
BEAT THE HEAT DURING THE OLYMPIC GAMES TOKYO 2020 12What to drink
Figure 11: Hydration index (i.e. amount of water retained as HEAT
compared to still water) of common beverages Sodium (salt) supplementation during
ACCLIMATISATION ACCLIMATION
exercise lasting longer than one hour
0.0 0.5 1.0 1.5
Natural Environment
2.0 is Artificial
recommendedEnvironment for heavy and “salty”
(outdoor/field training) (indoor/laboratory training)
Skimmed milk sweaters. Sodium intake may be
increased before and after hot-weather
Full fat milk training and racing. Electrolyte tablets
Orange juice or some salt (a pinch of salt at a time)
SELF-PACED CONSTANT CONTROLLED CONTROLLED PASSIVE
EXERCISE WORK RATE INTENSITY may be used by athletes
HYPERTHERMIA HEATING during training
Cola and competition by those who tolerate
Diet cola it. It is also advisable to include 30–60
g/h of carbohydrates to drinks for
Cold tea sporting performances lasting about
Tea one hour and up to 90 g/h for longer
ACTIVITY ACTIVITY ACTIVITY ACTIVITY
events. ACTIVITY
These recommendations can
Football, running, etc. Walking at 6km/h, Cycle ergometer at Work +/– Rest to Water immersion,
Sports drink running at 12km/h, 65% VO2max heart rate be achieved throughsauna
maintain core or a bathing
combination of
cycle ergometer at 185 W temperature at 38.5°C
Sparkling water CONDITIONS (e.g. 145 bpm)
fluids and solid foods. CONDITIONS After training or
Outdoor (variable) CONDITIONS CONDITIONS CONDITIONS
Indoor (40°C, 40%RH) Outdoor (variable) competition in theWater heat, recovery drinks
40–42°C
Sauna 70–90°C
Still water Indoor (40°C, 40%RH) Indoor (40°C, 40%RH)
DURATION
Indoor (40°C, 40%RH)
should include sodium, carbohydrate
and DURATION
if necessary, protein
Lager 60–90 MINS DURATION DURATION DURATION 45–60 MINS, to or optimise
60–90 MINS 60–90 MINS
recovery. The preferred method of
60–90 MINS intermittent for 30 MINS
Coffee
rehydration is through the consumption
of fluids with foods, including salty food.
Source: Maughan, R. J. et al. Am J Clin Nutr 103,
717–723 (2016).
BEAT THE HEAT DURING THE OLYMPIC GAMES TOKYO 2020 13What about pre- and per-cooling?
Figure 12: An example of a cooling vest that can HEAT
be used during the warm-up Before the start of sunglasses in a dark tint
ACCLIMATISATION competition, it is advisable ACCLIMATION (i.e. Category 3) and their skin
Natural Environment to minimise unnecessaryArtificial Environment by using non-greasy sun-
(outdoor/field training) (indoor/laboratory training)
heat exposure and heat gain. screen (water-based sun
screen should be preferred
Athletes should therefore
to oil-based sun-screen that
warm up in the shade if
may affect sweating).
SELF-PACED CONSTANT possible. CONTROLLED Athletes should CONTROLLED PASSIVE
EXERCISE WORK RATE INTENSITY HYPERTHERMIA HEATING
consider external (ice vests, Light-coloured clothing can
cold towels, or fanning) and also minimise the effect of
internal (cold fluid or ice the sun’s radiation and should
slurry ingestion) pre-cooling therefore be preferred, but
methods, or a combination clothing should not impair
ACTIVITY ACTIVITY of both.
ACTIVITY ACTIVITY sweat evaporation. ACTIVITY Self-
Football, running, etc. Walking at 6km/h,
running at 12km/h,
Cycle ergometer at Work +/– Rest to
maintain core
dousingor with water or other
Water immersion,
sauna bathing
cycle ergometer at 185 W External
65% VO pre-cooling
heart rate during
temperature at 38.5°Ccooling techniques that are
2max
CONDITIONS (e.g. 145 bpm)
CONDITIONS
Outdoor (variable) CONDITIONS warm-up CONDITIONS
such as with
CONDITIONS commonly adopted are less
Water 40–42°C
Indoor (40°C, 40%RH) Outdoor (variable) commercially availableIndoor
ice-(40°C, 40%RH)evidence-based
Indoor (40°C, 40%RH)
Indoor (40°C, 40%RH) Sauna 70–90°C
but may offer
DURATION cooling vests can provide
some psychological
DURATION benefit.
60–90 MINS DURATION effective DURATION
cooling without DURATION 45–60 MINS, or
60–90 MINS 60–90 MINS 60–90 MINS intermittent for 30 MINS
affecting optimal muscle Any cooling method should
temperature and function. be tested and individualised
during training and not in
During competition, athletes
competition, to minimise
should also protect their eyes
disruption to the athlete.
by wearing UV-ray blocking
BEAT THE HEAT DURING THE OLYMPIC GAMES TOKYO 2020 14To find out more, visit www.olympic.org/athlete365/well-being/beat-the-heat
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