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NEWS

Practical Information for Playing in the Heat

May 25, 2008 11:58 AM

Written by USTA Sport Science Committee

When preparing to play in hot weather, it is important to have a plan well in advance to help organize and implement your strategy for playing in the heat. Following the guidelines below will help to reduce the risk of heat illness while enhancing your performance.

PREPARATION:

  • Get fit. High aerobic fitness and an appropriate level of body fat can give you a big advantage when it comes to tolerating the heat, reducing heat storage, and effectively regulating your body temperature during play.

  • Taper your training. Reduce the volume of training during the days preceding a hot weather event. This gives your body a chance to recover, so that you don’t start the event fatigued or over trained.

  • Acclimatize to the heat. Training in the heat will promote heat acclimatization, which reduces the risk of heat illness and helps you to perform better. If possible (especially if you are traveling to a much hotter environment), plan to arrive at least a few days early. Even though full heat acclimatization takes 10-14 days (if you are not used to the heat at all), 2-3 days can really help.

  • Clothing – be sure that you have the proper clothing on hand. White or other light clothing reflects solar radiation (which can readily heat you up). Use a single layer of loose fitting, lightweight cotton/polyester blend rather than 100% cotton or tightly woven nylon. Sweat-saturated clothing should be replaced by dry clothing whenever possible – so pack plenty of extras. Lose the dark cap – wear a light colored one.

HYDRATION:

  • Drink plenty of fluids – (water, juice, milk, sport drinks) throughout the day. Avoid excessive caffeine intake (soft drinks, coffee, etc.).

  • Check your urine – it should be fairly light-colored or almost clear. Note: if you are constantly in the bathroom to urinate (e.g., every 45 minutes), you may be drinking too much!

  • Drink regularly – during all practice and warm-up sessions.

  • Before Play – drink 12-16 ounces about 1 hour before play begins.

  • During Play – drink 4 to 8 ounces (4 to 8 normal swallows) after warm-up and at each changeover. Typically, older adolescents and adults can comfortably drink up to 48-64 ounces per hour (younger players need much less). This rate of fluid intake can prevent large fluid deficits from developing for most players. A sport drink or a sport drink and water combination can be equally effective in providing fluid and energy during match play.

  • After Play - Continue drinking after play, to restore any fluid deficit that remains. If you sweated a lot and have to play again soon, fluid intake should begin immediately.

  • Add some salt to your diet – (by eating certain high-salt foods or adding it to meals or drinks) before and after you play in a hot environment, especially if you are prone to cramping. This helps your body to retain the fluid that you drink and avoid problems such as heat-related muscle cramps.

Note: The above recommendations for hydration are general guidelines. Physical characteristics particularly sweating rates and electrolyte losses will vary with each player. Therefore, players should consume fluids according to their specific needs and not necessarily published recommendations.


OTHER FACTORS:

  • Eat plenty of carbohydrates (bread, cereal, potatoes, rice, fruit, etc.). Playing tennis in the heat causes the body to use carbohydrates faster; thus, your requirement for carbohydrate is greater.

  • Get plenty of sleep. Insufficient sleep increases your susceptibility to heat illness.

  • Stay in a cool environment (especially just before play) as much as possible. This can reduce the physiological and psychological strain when you are on the court.

  • Practice early in the morning or in the early evening when the weather is not as extreme.

  • Medications – ask your doctor about any medication that you are taking with respect to its potential effect on hydration or tolerance of the heat.

  • Recent illness – especially if it involved fever, a respiratory track infection, or diarrhea, a recent illness (within the past week) can make you more susceptible to problems in the heat. Consult your doctor about participation.

  • Sunburn – sunburn can increase your susceptibility to heat illness. Use sunscreen (SPF 15-30) on all exposed areas of the skin when you practice and play.

EARLY SIGNS OF HEAT ILLNESS
Includes but not limited to:

  • Headache
  • Apathy
  • Clumsiness
  • Nausea
  • Weakness
  • Confusion
  • Dizziness
  • Muscle twinges or crampsIrritability
  • Decreased performance

Players, coaches, and parents should be advised of the early signs of heat illness. One or more of these symptoms may be enough to discontinue further play and seek medical attention.

Knowing these signs and addressing the above factors will help you to play longer, more effectively, and safely in hot weather.

 

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