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www.answers.com/Q/Is_a_heart_rate_of_40_dangerous_for_a_57_year_old_man

A heart rate of 40 is a bit slow for anyone. A slow heart rate is called bradycardia, and can be a symptom of many things. The most common is medications. A very common kind of medication, called ...

myheart.net/articles/low-heart-rate-bradycardia-explained-by-a-heart-doctor

The medical term for a low heart rate is bradycardia. Sometimes a low heart rate is defined as below 60 beats per minute, but it would probably make more sense to have low heart rate defined as below 50 beats per minute. Patients often ask if they have a low…

www.drugs.com/answers/my-heart-rate-is-45-is-this-dangerous-what-does-392796.html

My heart rate is 45. Is this... My heart rate is 45. Is this dangerous what does it mean? Asked 13 Apr 2011 by emdav Updated 13 April 2011 Topics blood disorders, blood pressure. I do not take any heart tablets or betablockers and my blood pressure is 137/86. Answer this question.

iytmed.com/slow-heart-rate-dangerous

When is a slow heart rate dangerous? Unusually slow heart rates are normally those below 60 beats a minute and can be either harmless or harmful. At certain times, however, such as during sleep, heart rate will be slow and still be regular. What counts as an abnormally slow heart beat for a single person may not be the same for another.

www.healthtap.com/user_questions/1026691-is-a-heart-rate-of-45-dangerous

Varies. There is no specific dangerous heart rate during exercise.How fast your heart beats with exercise depends on a number of factors, especially your conditioning. If you are healthy, a heart reate in the 170's or even higher may be ok and tolerated.

health.clevelandclinic.org/is-a-slow-heart-rate-good-or-bad-for-you

Is a Slow Heart Rate Good or Bad for You? ... The heart rate can also slow down normally while we are asleep to 40 to 60 beats a minute. Is bradycardia dangerous? For most young people, highly ...

www.healthline.com/health/dangerous-heart-rate

What is a dangerous heart rate? Heart rates vary from person to person, influenced by activities, general health, and other variables. We’ll take a look at when your heart rate can be too fast ...

answers.yahoo.com/question/index?qid=20130731165539AA2CQIL

No, a heart rate of 30 is not enough to support our vital functions and is a medical emergency. Sometimes people whose bodies are in extremely healthy condition have slower heart rates than average, but even by that standard 30 is too low.

www.webmd.com/heart-disease/atrial-fibrillation/bradycardia

Generally, you want a slow heart rate when you’re resting. It’s a sign of good health. But if it’s too slow, it could be a symptom of a condition called bradycardia.

universityhealthnews.com/daily/heart-health/low-heart-rate-dangerous

A low heart rate may be a sign of an efficiently working heart. Or, if the rate becomes too slow, a low heart rate could be a sign of health complications down the road. A normal or healthy resting heart rate for an adult is between 60 and 100 beats a minute. A heart rate near the lower end of that range is considered a good sign.