As a critical care nurse, I can attest that there is not one normal heart rate for 75-year-olds (or people of any age for that matter). As stated earlier, 60-100 beats per minute is considered the textbook normal range for resting heart rate. However, in addition to being a fairly wide range to begin with, there are quite a few circumstances that can cause exceptions to this range.
Athletes and other very fit people, for example, often have resting heart rates below 60 (even down to 47-48) with no cause for concern. People in a hypermetabolic state (burn patients, for example) frequently have heart rates up to 120 bpm for weeks while they are healing and we are not alarmed. Medicines, especially blood pressure medicines, can greatly affect heart rate as well, so they need to be taken into account.
If someone I loved was 75 and had a resting heart rate of close to either 60 or close to 100, I would recommend they mention it to their doctor at their next checkup, just to bring it to the doctor's attention and see what he/she says. Seventy-five years is a long time for the heart circuits to have been working and sometimes the electrical system of the heart gets a little glitchy with age. This can be expressed in minor effects like brief (say It can also be seen in more dangerous effects like an irregular rhythm that doesn't go away because certain sections of the heart are getting bogus electrical signals and therefore not pumping adequate blood to the body.
I guess it gets down to one of my favorite guidelines in medicine: if you feel like something is wrong or your body is giving you signals that something is wrong, get to your doctor and let him/her know. If they are dismissive and tell you they know better than you with no evidence to back up their position, find a doctor who will listen to your concerns and check them out. I often say to my (conscious) patients, "I can't read your mind or get inside the way you feel.
You know your body better than anyone. " It's up to you to tell the medical professionals how things are feeling in there so they can make informed decisions about your care.P.S.If you are wanting a "normal" heartrate to begin an exercise program at 75, I certainly recommend running that by your doctor first.
Beats per minute when resting tends to be higher for both newborns and the elderly so don't be surprised to find numbers closer to 70-90 bpm for a 75 year old rather than 60-70bpm.
You should try to have it at approximately between 60 and 100bpm. If you are exercising, you should try to stay below 85% of your maximum heart rate. See the website for more details.
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