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Effects of exercise intensity on sweat rate

Effects of Exercise in Heat

Physiological responses to heat accumulation

surface blood flow is increased at expense to other tissues

EPI release– HR upward drift glycogen use

blood volume cardiac efficiency ( SV, HR)

fatigue

Effect of Dehydration

on HR

Dehydration and Performance

Fluid balance

dehydration impairs endurance performance, – minimal effect on power and speed events

blood volume will skin blood flow and heat dissipation

thirst mechanism doesn’t keep up with dehydration

need for water replacement > than electrolyte replacement

Maintaining fluid balance

fluid intake during exercise will:– minimize dehydration– minimize rise in body temperature– reduce CV stress

[CHO] > 6-8% slows absorption from gut

Sport Nutrition: Sport Drinks

[CHO] affects fluid absorption rate in gut– Gatorade – 6%– Exceed – 7.2%– Coca-Cola – ~11%– Sprite – 10.2%– cranberry juice – 15%– orange juice – 11.8%

ACSM Fluid Replacement Recommendations

Before exercise, drink: – ~500 ml 2 hr before exercise

During exercise, drink:– early and at regular intervals– to replace lost fluids (if tolerated)– over-hydration can result in hyponatremia

After exercise, drink:– excess of that lost during exercise

Acclimatization to exercise in heat

body fluids/blood volume (w/in 3-5 d) skin blood flow rate of sweating (may take up to 10 d) electrolyte loss heat tolerance

Achieving heat acclimatization normal workouts in heat for 5-10 d

Heat acclimatization

Suggested Readings(available at gssiweb.com under Sport Science Exchange)

Murray, R. Fluid replacement: The American College of Sports Medicine Position Stand. GSSE 9(4) SSE#53, 1996. http://www.gssiweb.com

Maughan, R.J. and S.M. Shirreff. Preparing athletes for competition in the heat: developing an effective acclimatization strategy. GSSE 10(2) SSE#65, 1997.http://www.gssiweb.com

The primary mode of heat dissipation during exercise is

a. convection

b. radiation

c. conduction

d. sweat evaporation

What likely is the primary cause of HR drift during moderate-intensity exercise in heat?

a. plasma volume leading to SV

b. Epi release

c. temperature

d. sweating

e. body weight

Which of the following fluids would best maintain hydration during exercise in heat?

a. water

b. orange juice

c. Coke

d. Coke without carbonation

e. fruit juice