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Doctor insights on: Heart Rate Danger Zone

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What causes spontaneous rapid heart rate and what are the dangers?

What causes spontaneous rapid heart rate and what are the dangers?

A number of things: It many be that your heart rate increases from factors as simple as drinking too much coffee, or simply being tired or anxious. In some people, a conduction variation in the heart will suddenly bump the rate up. If you have shortness of breath, faintness, dizziness, lightheadedness, or chest/jaw/shoulder pain, get to the ER or call 911. ...Read more

Heart Rate (Definition)

Heart rate is a measurement of the number of times a person's heart beats in one minute. Normal heart rates vary with a person's age and with excitement and exercise. Abnormal heart rates are too slow, too fast, and/or irregular (too much ...Read more


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What is the danger or benefit of going past your target heart rate?

What is the danger or benefit of going past your target heart rate?

Variable: The target heart rate (thr) is usually 50-75 % of the maximum heart rate for an individual.

Ideally you get the maximum benefit when you stay with in the thr but going over for a few minutes is not a big problem.

There really is not major advantage from a training perspective to go above the thr. ...Read more

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Is there any long term dangers of having a constant regular sinus rythym, yet slightly tachycardic heart rate?

Is there any long term dangers of having a constant regular sinus rythym, yet slightly tachycardic heart rate?

Probably not: There is a tachycardia-induced cardiomyopathy which is occasionally seen in people with a chronic tachycardia. The exact rate necessary to produce the problem is not clear but it would be less likely to occur with a "mild" tachycardia. When there is tachycardia, though, we always look for the cause. If your thyroid gland is overactive for instance that needs to be treated. ...Read more

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Why is my heart rate so high while running? Could I be in danger of a serious arrhythmia?

Why is my heart rate so high while running? Could I be in danger of a serious arrhythmia?

Objective values: Some people are more heart aware than others. Sometimes patients think they have a high heart rate when in reality it is within normal and appropriate range. Objective evaluation by pulse meter or electrocardiographic monitoring is necessary to fully answer your question. Ask your health care provider to evaluate you at rest and during exercise to relieve your concerns. ...Read more

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Heart rate 153 how danger? Can my heart stop if continue fast? Also I'm asthma and most of the time I can't breath normal. Plzzz help

Heart rate 153 how danger? Can my heart stop if continue fast? Also I'm asthma and most of the time I can't breath normal. Plzzz help

Go to the ER NOW!: This is a dangerous heart rate. Go to the er now, you need immediate help. Have somebody drive you, if there is no one available call 911! good luck! ...Read more

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Could losing weight a few lbs a week and low resting heart rate 40 be signs of danger? I started to eat vegan style and exercise moderately recently.

Could losing weight a few lbs a week and low resting heart rate 40 be signs of danger? I started to eat vegan style and exercise moderately recently.

Most likely not: Exercise and healthy eating will lower your heart rate and cause weight loss. If you are having symptoms, however, of a low heart rate - dizziness, passing out, low energy, fuzzy thinking, then you need to get that checked out. ...Read more

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My sister and I walk treadmill for thrity min her heart rate stays 85 mine 129 she takes blood pressue meds any danger in that I am 63 129 heart rate and she is 69

My sister and I walk treadmill for thrity min her heart rate stays 85 mine 129 she takes blood pressue meds any danger in that I am 63 129 heart rate and she is 69

Blood: Blood pressure medications often include beta blockers like metoprolol or atenolol. These drugs can prevent one's heart from going faster when one exercises. If your sister is taking one of these nmedications it might explain the difference in your heart rates.
The effectiveness of aerobic exercise is often judged by the heart rate one achieves during the exercise. For vigorous exercise, a target heart rate of 110 to 133 would be reasonable for an average 63 year old. Consider discussing your target range with an exercise physiologist or personal trainer. If you get short of breath or have chest tightness on the treadmill, you should definitely discuss this with your doctor.
Other medications which can lower your maximum heart rate include medications to reduce irregular heart beats, some calcium blockers and digoxin. H-2 blockers prescribed for acid reflux may also reduce the maximum heart rate. Ask your doctor if you need to use a lower target heart rate. ...Read more

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Is lower heart rate, the lowest was 37bpm during sleep, (recorded on holter monitor), any danger? I am 33 male, 183cm 92kg. Have b12 defficiency, D defficiency and chronic sinusitis.

Is lower heart rate, the lowest was 37bpm during sleep, (recorded on holter monitor), any danger? I am 33 male, 183cm 92kg. Have b12 defficiency, D defficiency and chronic sinusitis.

How do you FEEL?: If you're an athlete and not having spells where you pass out, this is fine and you should be proud of it. If you have other evidence of heart pathology, it's your physician's decision whether to have you worked up for some obscure illness. If your B12 and D deficiencies are due to vegetarianism, please begin supplementing; if not, try to find the cause and supplement appropriately. ...Read more

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Is a heart rate of 45 dangerous?

Is a heart rate of 45 dangerous?

Slow heart beat: If you don't have any symptoms like dizziness, pre-syncope, syncope or fatigue or chest pain or shortness of breath, then you are ok. But you complained of chest pain. Hence it should be treated. Its etiology should be elicited. Thyroid problems and blocks in heart arteries should be ruled out. Consult your physician. ...Read more

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What is considered a dangerous heart rate?

What is considered a dangerous heart rate?

Heart rate: Normally heart rate responds to exercise or physiologic demand levels. Usually we don't see it go over 180-200 even with high levels of exercise. This level while tolerated by 'normals' may be dangerous in patients with heart disease or other forms of disease. In other words, one number doesn't fit all. ...Read more

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What's is a dangerous heart rate while doin cardio?

What's is a dangerous heart rate while doin cardio?

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. Now if you have a problem such as coronary disease, the safe heart rate would depend on an assessment by your doctor. A stress test is commonly done. ...Read more

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How dangerous is it if my heart rate drops below 40?

How dangerous is it if my heart rate drops below 40?

Depends: It depends. ....What symptoms do you or don't you have? Many people experience heart rates in the 30s during sleep. Further evaluation & holter or event monitoring should be considered. See your physician. ...Read more

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What do you advise for heart rate of 30. is that dangerous?

What do you advise for heart rate of 30. is that dangerous?

Depends: It depends on how long, what time of day, and whether there are any symptoms present. It's not unusual to drop to 30 during sleep or to have a brief spell of 30 while awake. It also depends what caused it: the EKG will have clues. ...Read more

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What happens if you go over your max heart rate while working out? Dangerous?

What happens if you go over your max heart rate while working out? Dangerous?

Maximal heart rate: Calculations are estimates. If you are heathy enough nothing will happen to you. During exercise you go up to where you can go. I go over mine all the times at 50 y/0. Enjoy your work out. ...Read more

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My heart rate has been between 100 and 108 for about five hours now. Is this dangerous?

My heart rate has been between 100 and 108 for about five hours now. Is this dangerous?

No: But concentrating on your heart rate has the tendency to INCREASE IT!


Just a thought

Hope it helps
Dr Z ...Read more

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My heart rate races when I lay down almost every night, it wakes me up. Is this dangerous?

My heart rate races when I lay down almost every night, it wakes me up. Is this dangerous?

Usually benign: Get checked though for thyroid disorder, arrythmia (svt, pvc) etc. Or could just be anxiety/panic attack. Have u had holter monitoring done? Cut down on caffeine, soda, energy drinks and alcohol. Go see your dr for a repeat ekg. May need a beta blocker. If stress echo is normal, it means your heart is structurally sound. You are still young to have serious heart ailment. Give us some feedback! ...Read more

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While I'm cycling in the morning my heart rate goes to as up as 175bpm with a average of 150bpm. It's that too dangerous or its normal?

While I'm cycling in the morning my heart rate goes to as up as 175bpm with a average of 150bpm. It's that too dangerous or its normal?

Normal: Everyone has an intrinsic "maximal heart rate" which is different for each of us. During a strenuous workout, you may in fact want to get to 95% of your max heart rate. Unfortunately, without a max heart rate test, you don't know what that is. In any event, if you feel good about the effectiveness of your workouts then there is no cause for concern. ...Read more

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Of the numerous heart rate zone conditioning formulas. Who's formula do you feel is the most productive for a male 46 year old amateur athlete?

Of the numerous heart rate zone conditioning formulas. Who's formula do you feel is the most productive for a male 46 year old amateur athlete?

General rules below: Consider exercising for a sustained period of time (20-40 minutes) at 60-70% of your maximum heart rate. One formula we use is 220-age. So for you, 220-46 =174. 174 x 0.6 = 104. 174 x 0.7 = 122. So, strive to keep your heart rate between 104 and 122. ...Read more

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Was doing some cardio work outs yesterday for the first time in a while and my heart rate went up to 200 beats a min. Is this normal or dangerous?

Was doing some cardio work outs yesterday for the first time in a while and my heart rate went up to 200 beats a min. Is this normal or dangerous?

Neither: Deconditioned peole can have rapid pulses with excercise. Depending on ones age the heart rate max is 220- the age. So for a 20 year old this can be normal. The heart rate with exercise should improve with persisten excercise as vagal tone improves. One should stopnexcercise if dizzy, lightheaded, chest pain or excessive difficulty breathing and see a doctor to be sure. ...Read more

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Been bedridden for a year, been sitting up some lately. Sat up 4 hours and counting as of this post Heart rate up at 89. Is this dangerous for me?

Been bedridden for a year, been sitting up some lately. Sat up 4 hours and counting as of this post Heart rate up at 89. Is this dangerous for me?

Heart rate: Normal heart rate is 60-100. Deconditioning and muscle wasting will occur in patients who are bedridden and heart rates will be higher. Additionally standing and walking will require intense physical therapy ...Read more

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My heart rate is at 116, is it dangerous?

My heart rate is at 116, is it dangerous?

Perhaps...: Get more physical buddy! Become a fit and happy dude... Good luck! ...Read more

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MY HEART RATE IS 121-124 BPM IS IT DANGEROUS?

MY HEART RATE IS 121-124 BPM IS IT DANGEROUS?

No: That heart rate isn't dangerous but it's unclear whether or not it's normal. If you've been active, anxious, have fever, pain, thyroid excess, anemia etc., it may be appropriate. If you're resting and it doesn't slow down over 5 minutes, it's abnormal and you should get an EKG done ASAP for purposes of diagnosis. ...Read more

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Hoping you can tell me, is high heart rate dangerous?

Hoping you can tell me, is high heart rate dangerous?

How high?: High heart rate more than 100 beats per minute can be a sign of lack of physical conditioning, endocrine disease like hyperthyroidism, sign/symptom of heart disease, dehydration, lung disease like asthma/copd, drug induced like to much caffeine/ energy drinks, chronic disease like liver and renal insufficiency, etc. You need a history and physical to evaluate the reason. ...Read more

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If your heart rate is 150 and SPO2 is 90, is that dangerous?

If your heart rate is 150 and SPO2 is 90, is that dangerous?

Maybe: If you are resting, a heart rate of 150 and SPO2 of 90 is definitely abnormal. See your doctor. ...Read more

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What is a dangerous heart rate for a 51 year old female at rest?

What is a dangerous heart rate for a 51 year old female at rest?

Resting HR: HR is usually between 60-90, 72 is best. We usually don't worry till < 45 or 40 (may not perfuse enough), as athletes may have HR in 50's, or higher than 100 (120-130 is really more worrisome (beating to fast to perfuse), 100 just tells us to evaluate why high). Hypo/hyperthoridism affect HR, medications (caffeine/alcohol/), POTS, cardiac issues, rare conditions like carcinoid/ f/u/ w/ doc, ...Read more