Environmental Concerns

Heat Stress1. The body will function normally as long as body temperature is maintained in a normal range.2. Maintaining normal body temperature in a hot environment depends upon the body’s ability to dissipate heat.

Hyperthermia

1.Notmal metabolic function in the body results in the production and radiation of heat; the higher the metabolic rate, the more heat produced.

Metabolic Heat Production

2.Dissipating HeatA. Evaporative Heat Loss: Sweat glands in the skin

allow water to be transported to the surface where it evaporates, taking large quantities of heat with it. B. A normal person can sweat about 1 quart of water per hourC. Sweating does not cause heat loss, the sweat must evaporate for heat to be dissipated, and the air must be relatively free of water for evaporation to occur.D. Evaporation is severely impaired when the relative humidity reaches 65% and virtually stops at 75%

Evaporative Heat Loss

Heat CrampsA. Heat Cramps

1. Painful muscle spasms commonly in the calf and abdomen

2.Related to excessive loss of water and electrolytes (sodium, potassium, magnesium, and calcium)

Extertional Heat Illness

Immediate treatment is ingestion of large quantities of fluids- sports drinks

Heat Cramps

Heat Exhaustion1. Athlete becomes dehydrated to the point that he/she is unable to maintain adequate cardiac output.

Extertional Heat Illness

Signs and symptoms : pale skin, profuse sweating, stomach crams with nausea, vomiting or diarrhea, headache, persistent muscle cramps and dizziness/loss of coordination.

Heat Exhaustion

Treatment: Immediately remove athlete from heat and start cooling.

Monitor heart rate, blood pressure and core temperature- may need to transport to emergency facility.

Heat Exhaustion

Life Threatening Emergency- Caused by severely elevated body temperature.

Heat Stroke

Clinically characterized by sudden collapse with CNS dysfunction such as altered consciousness, seizures, confusion, emotional instability, irrational behavior or decreased mental acuity.

Heat Stroke

Hot flushed skin with less sweating than seen in heat exhaustion, shallow breathing, rapid strong pulse, nausea, vomiting or diarrhea, headache, dizziness or weakness, decreased blood pressure and dehydration.

Heat Stroke

The longer the body temp is above 104° the higher the mortality rate. Body temperature must be cooled immediately and immediate medical attention is necessary.

Must activate EMS

Heat Stroke

Extertional Hyponatremia1. Low level of sodium concentration in blood, caused by ingesting too much fluid. 2. Fluid intake should not exceed fluid losses.

Extertional Heat Illness

Symptoms: Headache, nausea, vomiting, swelling of hands and feet, lethargy, apathy or agitation, low blood sodium (<130 mmol/L)

Extertional Hyponatremia

DehydrationA. Signs of dehydration: Thirst, dry mouth, headache, dizziness, irritability, lethargy, excessive fatigue, and possibly cramps.B. Physiological effects: reduced muscle strength and endurance, decreased blood volume, altered cardiac function, impaired thermoregulation, decreased kidney function, reduced glycogen stores and loss of electrolytes.

Preventing Heat Illness

Fluid and Electrolyte Replacement A. Average adult requires a minimum of 2.5 liters of water (10 glasses) a day. B. Normal sweat-loss rate during an hour of exercise ranges between 0.8 and 3 liters, with average 1.5 liters per hour. C. Body weight drops by 1-2%, you begin to feel thirsty- Do not rely on thirst as a signal to drink D. Athletes should be drinking enuogh so that their urine is clear. E. Most people only replace 50% of the water they lose through sweating.

Preventing Heat Illness

Using Sports Drinks A. Replacing lost fluids with sports drinks is better than with water- sports drinks replace both fluids and electrolytes and they taste better so athletes tend to drink them more than plain water. B. Sodium in sports drinks allows the body to hang on to the fluids longer than water does. C. Optimal Carbohydrate level is 14 grams per 8 ounces of water for quickest absorption.

Preventing Heat Illness

Gradual Acclimatization Identifying Individuals More at Risk

A. Athletes with large muscle mass and overweight individuals are prone to heat illness. B. Death from heatstroke increases at a ratio of 4:1 as body weight increases. C. Women are more physiologically efficient in body temperature regulation than men- women tend to sweat less and manifest a higher heart rate when working in heat. D. Other susceptible individuals include those with poor fitness levels or a history of heat illness.

Preventing Heat Illness

Selecting Appropriate Uniforms A. Uniforms should be selected on basis of temperature and humidity. B. Rubberized suits should never be worn.

Maintaining Weight RecordsA. Athletes should weigh in and out for the first two weeks of practice. B. A loss of 3-5% of body weight will reduce blood volume and could lead to a health threat.

Preventing Heat Illness

Monitoring the Heat IndexA. Heat index is the combination of relative humidity and air temperature. The higher the heat index, the more precautions should be taken.

1. Modifications in practice should be made according to the Dry Bulb/Wet Bulb readings.

Guidelines for Athletes Who Intentionally Lose WeightA. NCAA and many state high school federations have recently established guidelines for weight loss and set policies for how and when a wrestler can officially weigh in. B. NCHSAA: allows wrestlers to only lose 1.5% per week.

Preventing Heat Illness

Combination of cold, wind, and dampness creates environment predisposing an athlete to hypothermia.

65% of heat produced by the body is lost through radiation- mostly through the head and neck.

20% of heat loss is through evaporation, two-thirds through the skin and one-third through respiratory tract.

Shivering ceases below a body temp of 85°-90°F (29.4°-32.2°C) Death is imminent if the core temp drops between 77 and 85°F (25°-29°C)

Hypothermia

PreventionA. Should dress in thin layers, that can be added or removed as the temperature decreases or increasesB. When working or exercising in temps below 32°F (0°C), it is advisable to add a layer of protective clothing for every 5 mph. of wind. C. Athletes still need to replace fluids in cold weather, as they can still become dehydrated and that in turn will reduce blood volume, which means less fluid is available for warming the tissues.

Hypothermia

Frost NipA. Involves ears, nose, cheeks, chin, fingers and toes.B. Commonly occurs when there is high wind, severe cold, or both.C. Skin appears firm, very cold, painless areas that may peel or blister in 24-72 hours.D. Treat with firm sustained pressure (without rubbing), gentle re-warming.

Common Cold Injuries

FrostbiteA. Chilblains: Skin redness, swelling, tingling and pain in the toes and fingers. B. Superficial Frostbite: Involves only the skin and subcutaneous tissue, skin appears pale, hard, cold and waxy. With re-warming will feel numb and then sting and burn. Later blisters will appear and will be painful for weeks.

Common Cold Injuries

Deep Frostbite: Tissues are frozen- medical emergency and requires hospitalization. Tissue is hard, cold, pale or white and numb. Rapid rewarming is required and will appear blotchy red, swollen, and extremely painful, may become gangrenous (tissue death).

Common Cold Injuries

Lightning is number 3 cause of death by weather related phenomena- 51 fatalities per year for past 20 years in the US

However only 26 in 2011 If you hear thunder or see lightning seek protective shelter indoors at once. If not available, an automobile is a safe alternative.

Lightning Safety

Avoid standing near large trees, flagpoles, or light poles.

Choose an area not on a hill, see a ditch, ravine or valley.

Lightning Safety

If you feel the hair stand on end and skin tingle- drop to the ground in a crouched position, do not lie flat to decrease body’s surface area in contact with the ground.

Avoid standing water, showers, telephones, and metal objects at all times (bleachers, umbrellas, etc.)

Lightning Safety

“Flash-to-Bang” Method: To use, begin counting on the lightning flash and stop counting when the associated thunder is heard. Divide this number (in seconds) by 5 to determine the distance (in miles) to the lightning flash.

30 Minute “Return-to-Play” Rule: If a game, practice, or other activity is suspended or postponed due to lightning activity, it is important to wait at least 30 minutes after the last lightning flash or sound of thunder. Each time the lightning or thunder is seen or heard, the 30 minutes should be reset.

Lightning Safety

Managing Victims of Lightning Strike1. Survey the scene for safety2. Carefully remove victim to safe area, if needed.3. Evaluate and treat any breathing/circulation problems4. Evaluate and treat for shock5. Evaluate and treat for burns and fractures.

Because lightning-strike victims do not remain connected to a power source, they do not carry an electric charge and may be safely handled.

Lightning Safety

Long-Term Effects on SkinA. Premature aging of the skin and skin cancerB. Skin cancer is most common malignant tumor found in humans, damage to DNA is suspected as the cause of skin cancer but exact cause is unknown.

Overexposure to the Sun

Using SunscreensA. SPF (Sun Protection Factor): An SPF of 6 indicates that an athlete can be exposed to UV light six times longer than those without sunscreen. B. Sunscreens needed between March and November, but should be used year round, also should be used between 10 A.M. and 4 P.M. and should be applied 15-30 minutes prior to sun exposure.C. Clothing can provide some protection but are not a substitute for sunscreen, a typical white T-Shirt provides an SPF of 5.

Overexposure to the Sun

Slip Slap Slop: Slip on a shirt, slop on sunscreen, and slap on a hat!

Apply a sunscreen with SPF 30 or higher.

Reapply sunscreen every 2 hours Wear a hat that shades your face and

neck

Overexposure to the Sun

Stay in the shade when possibleAvoid unnecessary exposure to radiation from sunlamps and tanning beds

Wear lip balm to protect your lips from drying/cracking

Wear sunglasses to protect your eyes.

Overexposure to the Sun