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www.reference.com/article/causes-low-heart-rate-be3015c7cd24d2b5

Bradycardia, or a slow hear rate, can result from being in good physical condition or from underlying health problems. Very fit, young adult athletes often have heart rates lower than the normal adult range of 60 to 100 beats per minute, according to WebMD.

www.reference.com/article/symptoms-low-heart-rate-5d21aaa8b758bf40

Typical symptoms of a low heart rate include weakness, dizziness, memory problems and shortness of breath, according to Mayo Clinic. These symptoms occur due to an insufficient supply of oxygen to the brain and other vital body organs.

www.reference.com/article/heart-rate-controlled-a9e689098b383203

The body controls the heart rate through its own electrical system that ensures blood flows through the heart and lungs in a controlled manner. Issues with the electrical system, such as an arrhythmia, can cause problems with a regular heart beat and how the body controls heart rate.

www.reference.com/article/normal-heart-rate-cc5d753629ac362

Normal resting heart rate for adults is between 60 and 100 beats per minute, according to the Mayo Clinic. Resting heart rate varies considerably by age, but after 16, teenagers have the same normal range as adults.

www.reference.com/article/considered-fast-heart-rate-4bdac1a05c8c4e69

A heart rate of more than 100 beats per minute in adults, a condition called tachycardia, is considered fast according to The American Heart Association. However, what is considered fast depends on the age and physical condition of an individual.

www.reference.com/article/effects-low-heart-rate-806d17133fd915cc

Effects of slow heart rate, or bradycardia, include dizziness, shortness of breath, tiredness and chest palpitations, according to WebMD. People who have slow heart rate may also feel confused or faint.

www.reference.com/article/affects-heart-rate-4dba42bfb928c3de

According to the American Heart Association, heart rate is affected by factors both inside and outside the body. Body size, body position, personal emotions and use of certain medications can affect heart rate, although in some cases to a minimal extent. Air temperature also has a small effect on he

www.reference.com/article/considered-low-heart-rate-6805fea625b4496a

When a resting heart beats less than 60 times per minute, it is a lower-than-normal heart rate, called bradycardia, states WebMD. A low heart rate can be a sign of fitness, as in athletes and healthy young adults, or a sign of a problem with the heart's electrical system.

www.reference.com/article/heart-rate-reading-a521ba3fba1a462d

A heart rate is obtained by feeling for the pulse at one of the body's pressure points and tracking the number of beats for a set period of time, according to the American Heart Association. The goal is to determine the number of beats in one minute.

www.reference.com/article/rated-electric-ranges-89f1f23468c6d2b9

The best rated electric ranges differs by type of stove and the style of the review or comparison. Good Housekeeping, for example, provides top letter grades of A for three models, Electric Range Review compares the top 10 ranges, and Consumer Reports picks a top unit from each range type.