Page 94 - Athletic Health Handbook
P. 94
TEAM PHYSICIAN’S CORNER

HYDRATION AND THE ATHLETE

BETH GLACE, MS SPORTS NUTRITIONIST FLUIDS ARE PROBABLY THE MOST
Nicholas Institute of Sports Medicine & NEGLECTED ASPECT OF THE ATHLETE’S
Athlete Trauma DIET. During exercise metabolic rate may be increased five to 20 fold.
Lenox Hill Hospital
New York, New York Most of the expended energy is released as heat, such that an internal heat

load is produced that is proportional to exercise intensity.

Heat is dissipated from the body by both radiation and evaporation

of sweat. Each gram of sweat evaporated removes approximately 0.6 kcals

of heat energy, making sweating the most effective method of heat trans-

fer to the environment. Sweat rates are proportionate to the body’s core

temperature, and can exceed two liters per hour. Loss of fluid via sweating

may be even greater in athletes with large body masses, such as football

players. Thermoregulation in these athletes is complicated when exercise

is performed in full uniform, which limits the skin’s evaporative surface

and thereby limits heat transfer from the body.

HYDRATION AND THE ATHLETE 94
   89   90   91   92   93   94   95   96   97   98   99