s, particularly during and
after exercise, though, are also highly sensitive to a person’s hydration and
nutrition status. Dehydration represents a state of diminished water supply in your body. Because circulating blood is composed of approximately 83 percent water, dehydration effectively lowers the amount of blood that your heart
is able to circulate with
one beat, or contraction. Your heart
compensates for this low "water" volume
by beating more times per minute.